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  Subjects -> ENGINEERING (Total: 2266 journals)
    - CHEMICAL ENGINEERING (190 journals)
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ENGINEERING (1197 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 207)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 4)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 7)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 34)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 9)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 8)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 4)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 10)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 10)
Coastal Engineering Journal     Hybrid Journal   (Followers: 3)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 241)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 174)
Composites Part B : Engineering     Hybrid Journal   (Followers: 215)
Composites Science and Technology     Hybrid Journal   (Followers: 160)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | Last

Journal Cover Adsorption
  [SJR: 0.774]   [H-I: 52]   [4 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-8757 - ISSN (Online) 0929-5607
   Published by Springer-Verlag Homepage  [2335 journals]
  • Adsorptive smoothers for exhaust gas cleaning
    • Authors: Sven Meyer; Otto Carlowitz; Matthias Napp; Sven Gutperl
      Pages: 211 - 216
      Abstract: Abstract Organic solvents are used in a variety of production processes. Each process has a specific emission curve. Emission curves with high concentration peaks of organic solvents lead to difficult engineering of necessary exhaust gas treatment plants. The implementation of adsorptive smoother buffers organic solvents during high emission periods, while a discharge from the storage increases the output level during low emission periods. Additionally the cut off of emission peaks has the advantage of an easier compliance with safety requirements. Modelling results as well as experimental data show the effect of adsorptive smoothers for exhaust gas flows. Defining a degree of smoothing it can be shown that the amplitude of peaks can be reduced up to over 90 % depending of the adsorbent. Nevertheless experiments with multi-component mixtures of organic solvents are necessary to analyze effects like co-adsorption.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9822-9
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Probing adsorption on a nanoscale: field desorption microspectroscopy
    • Authors: Yuri Suchorski
      Pages: 217 - 224
      Abstract: Abstract Combining an energy analyzer with a field ion microscope equipped with a probe-hole which corresponds to just few atomic surface sites, spatially resolved energy analysis of ions field desorbed from the adsorbent surface is possible on a nm-scale. The experimentally measured values of the kinetic energy of field ions can be related (by means of a thermionic cycle) to the physically meaningful binding energy of corresponding adsorbed species. The development of the technique into a full serviceable micro-spectroscopy on a nanoscale allowed recent detection of the weakly adsorbed CO species on Pt(111) which are largely analogous to those adsorbed at high pressures and provided first results for the binding energy of Li adatoms in a coadsorption system, namely Li–O–W(112) for various lithium and oxygen coverages. In the present contribution, an overview of the experimental possibilities of the technique is given and recent results are discussed.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9824-7
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Influence of free-space calibration using He on the measurement of
           adsorption isotherms
    • Authors: Marie Shimomura; Masayuki Yoshida; Akira Endo
      Pages: 249 - 255
      Abstract: Abstract It is well known that helium (He) molecules that remain inside micropores after free-space calibration at a low temperature (77.4 K) affect the shape of an adsorption isotherm, especially in a very low relative pressure region. This negative effect of the remaining He leads to a misunderstanding of the porous characteristics, such as micropore size distribution and surface properties. However, it is still believed that such erroneous interpretations are limited to narrow microporous materials such as activated carbon and measurements at low temperatures, namely the measurement of the adsorption of N2 and Ar at their boiling points. Here we report a systematic investigation of the influence of free-space calibration using He on microporous, mesoporous and non-porous materials. Zeolite Y, mesoporous silica, carbon black and aerosil 200 were used for the measurements. N2, H2O and CO2 adsorption isotherms were measured at 77.4, 298 and 298 K, respectively. Free-space calibration was carried out before and after the isotherm measurement for each sample. Although the influence of the He that remained in the sample was small for the non-porous sample, the shape of the isotherms for the other samples in a low relative pressure region was rather affected by the timing of the free-space calibration even for the mesoporous sample, and at an ambient temperature.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9845-2
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Equilibrium and kinetics of adsorption of high molecular weight n
           -paraffins on a calcium LTA molecular sieve
    • Authors: V. I. Águeda; M. A. Uguina; J. A. Delgado; M. T. Holik; D. Aranda; I. D. López; J. J. Lázaro; J. Peláez
      Pages: 257 - 269
      Abstract: Abstract n-Paraffins are extensively used in the fabrication of detergents. These linear hydrocarbons can be selectively separated by adsorption from petroleum fractions using the appropriate adsorbent. Equilibrium and kinetic parameters are necessary to develop and design an adsorption process. These parameters are available in the literature for light paraffins in vapour phase, however there is scarce information concerning high molecular weight paraffins in liquid phase. The aim of this work is to study the equilibrium and kinetics of high molecular weight n-paraffins such as C10, C14 and C18 on a calcium LTA molecular sieve (5 A zeolite) in liquid phase. Pentane has also been analysed as it is mainly used as desorbent in the cyclic simulated moving bed (SMB) adsorption–desorption process of paraffins. A theoretical model has been developed to describe the column adsorption dynamics of the studied systems. The model has been included in a SMB simulation program, and the model prediction has been compared with the separation performance data reported for a commercial SMB unit that separates normal paraffins from a hydrotreated kerosene fraction.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9846-1
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Toxic gas sensing on nanoporous carbons
    • Authors: Nikolina A. Travlou; Teresa J. Bandosz
      Pages: 271 - 280
      Abstract: Abstract Activated carbons, either synthetic, developed in our laboratory, or commercial were prepared or further modified, in order to introduce specific heteroatoms such as oxygen, nitrogen and sulfur to their matrix. Chips with thin layers of active materials were prepared and used for ammonia or hydrogen sulfide sensing. They showed high sensitivity and their response was selective. They also responded linearly to changes in various ammonia concentrations. The incorporation of specific heteroatoms to the carbons matrices was an effective means to control the type of the charge carriers, and thus the electronic and transport properties. Depending on the specific chemical arrangement of heteroatoms, materials exhibiting n- or p-type conduction were obtained. Pyridines and nitropyridines played an important role. A small amount of ammonia was oxidized to NO2 on the surface of sulfur and nitrogen co-doped carbons, due to their ability to generate superoxide ions. When adsorbed in the pore system of the carbons, it affected the electrical signal due to an increase in the population of holes as charge carriers. The synergistic effect between the heteroatoms greatly enhanced the electrical response of the chips. The mechanism governing the reversible sensing involved several processes, including specific interactions between NH3 and surface functional groups, pore-filling with NH3/NO2, and electron–hole conductivity. The structural and chemical features of the carbons were found to act either synergistically or competitively. Surface acidity, by enhancing the affinity of the carbons towards NH3 adsorption, contributed to an ammonia selective detection.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9848-z
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • 5-fluorouracil adsorption on hydrated silica: density functional theory
           based-study
    • Authors: A. Díaz Compañy; A. Juan; G. Brizuela; S. Simonetti
      Pages: 321 - 325
      Abstract: Abstract Hydrated SiO2(111) has been projected as a competent support of an anticancer drug, 5-fluorouracil (5-FU). Theoretical calculations using the Vienna Ab-initio Simulation Package (VASP) were performed to study the drug-silica interactions that control the adsorption of 5-fluorouracil (5-FU) on an hydrated SiO2(111) surface. Only dispersive interactions are presented during the drug adsorption on the hydrophobic surface while cooperation exists between directional H-bonds and dispersion forces on hydrated silica. H-bonds become dominant for the hydrophilic surface driven interactions with important energetic consequences on adsorption. The density of states slightly shifted towards lower energy values showing a stabilization of the electron states of the 5-FU molecule on hydrated silica, and the electronic charge transfer mainly happens on the interface between polar groups of 5-FU and the nearest silanol groups, in agreement with the formation of the H-bonding interactions. The results reveal the remarkable influence of H-bonds in the adsorption mechanism on hydrated silica.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9853-2
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Adsorption accumulation of natural gas based on microporous carbon
           adsorbents of different origin
    • Authors: I. E. Men’shchikov; A. A. Fomkin; A. Yu. Tsivadze; A. V. Shkolin; E. M. Strizhenov; E. V. Khozina
      Pages: 327 - 339
      Abstract: Abstract Adsorption of methane on twelve microporous carbon adsorbents of different origin and structural and energy characteristics was studied at the pressures up to 20 MPa. Specific capacities have been calculated for methane adsorption storage systems. The effectiveness of adsorption accumulation was analyzed in terms of structural and energy characteristics, packing density and thermodynamic parameters of methane adsorption. Differential molar isosteric heats of adsorption and absolute efficiency of adsorption accumulation systems were evaluated. The effects of increased packing density and proper shape of adsorbent material on the adsorption accumulation efficiency were considered. It was shown that a selection of an adsorbent with the most optimal porous structure and density should be adjusted for thermodynamic parameters of accumulation system.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9854-1
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Decomposition of dimethyl carbonate caused by adsorption onto activated
           carbon
    • Authors: Friederike Stehmann; Eike Wiegmann; Stephan Scholl
      Pages: 341 - 348
      Abstract: Abstract This contribution addresses the adsorptive cleaning of an exhaust gas released from a Lithium–Ion-battery recycling process. Adsorption in fixed beds is frequently used to clean off gases containing solvents, toxic components, or other contaminates. Well-established short-cut models are available to determine capacity and dynamics of such adsorber beds. However, uncertainties arise if the gas contains unknown trace components or if new components appear due to chemical reaction or decomposition processes. In the present study, the off gas mainly consists of dimethyl carbonate in a nitrogen gas stream. Dimethyl carbonate decomposes when contacted with activated carbon. The decomposition product methanol co-adsorbs together with dimethyl carbonate onto activated carbon and therefore decreases the adsorption capacity for DMC. This paper shows the influences of temperature, residence time, carbon mass and water on the decomposition of dimethyl carbonate. Additionally, first results of fixed-bed experiments including temperature profile and breakthrough curve are discussed to show the effect of decomposition occurring in fixed-bed adsorption.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-016-9858-x
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Pretreatment of liquid industrial streams by adsorption: challenges and
           perspectives
    • Authors: Alexandra Godin
      Pages: 349 - 353
      Abstract: Abstract Liquid phase adsorption is a common process in waste water purification, desiccation applications or in (analytical) laboratory applications; e.g. chromatography. However, this economic separation process has even more potential. The removal of undesired poisonous, environmentally harmful or corrosive contaminants from organic liquids by adsorption is such an application. Here, contaminant concentrations can be brought down to the detection limit or even below. These contaminants can be e.g. sulfur or nitrogen compounds or heavy metals like mercury. In the liquid phase adsorption process the chemical and physical properties of the mobile components (adsorptive and bulk phase) as well as the nature of the adsorbent play an important role. Each industrial stream to be treated requires a precise analysis of the components involving the interactions between the components as well as possible resulting side reactions which may occur during the adsorption or desorption process. The paper focuses on the possibilities of desulfurization of liquid propane gas streams depending on the nature of the side components of the stream and the availability and the composition of the regeneration gas. The limitations of the adsorption capacity and selectivity of the adsorbent towards sulfuric compounds in the liquid phase are discussed. On the other hand the potential of the adsorption technology in purification of liquid streams as an inexpensive and readily available method is demonstrated.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-017-9859-4
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Effects of phosphoric acid activation on the nanopore structures of carbon
           xerogel/carbon nanotubes hybrids and their capacitance storage
    • Authors: Nady A. Fathy; K. P. Annamalai; Yousheng Tao
      Pages: 355 - 360
      Abstract: Abstract This paper aimed to study the electrochemical capacitance behaviors in relation to the nanopore structures of three carbon materials, which were prepared under different conditions and named as carbon xerogels (CXs), carbon xerogels/carbon nanotubes hybrids (CXs/CNTs) and activated carbon xerogels/carbon nanotubes hybrids (aCXs/CNTs). Field emission scanning electron microscopy showed the growth of CNTs on the CXs surface in the CXs/CNTs hybrids. Nitrogen physisorption measurements at 77 K indicated a decrease in the specific surface area and the total pore volume of micropores and mesopores after decorating the CXs surface with CNTs, however an increase after activation with phosphoric acid at 973 K for 180 min. Because of the combination of CNTs and phosphoric acid activation, electrochemical capacitance increased in the order of CXs < CXs/CNTs < aCXs/CNTs and it delivered maximum capacitance of 151 F g− 1 at 2.5 A g− 1 in 1 M H2SO4.
      PubDate: 2017-04-01
      DOI: 10.1007/s10450-017-9860-y
      Issue No: Vol. 23, No. 2-3 (2017)
       
  • Computer simulation of adsorption and sitting of CO 2 , N 2 , CH 4 and
           water on a new Al(OH)-fumarate MOF
    • Authors: Juliana A. Coelho; Adriano E. O. Lima; Alírio E. Rodrigues; Diana C. S. de Azevedo; Sebastião M. P. Lucena
      Abstract: Abstract The water present in all gas stream leads to changes in the adsorbed amount of the target gas and the selectivity among the constituents of the mixture. The high stability characteristics and low cost of the new Al(OH) fumarate MOF synthetized by BASF, makes it an interesting porous material with mild hydrophobic properties for industrial use. Thus, new force field parameters were proposed for the CO2, N2 and CH4 /Al(OH) fumarate systems validated by adsorption experimental data in three temperatures. The sittings of CO2, N2, CH4 and H2O molecules inside the MOF pores at high (303 K) and low (150 K or 230 K) temperatures were also presented. An alternative approach that performed Monte Carlo simulations on two ensembles, the canonical ensemble (NVT) and the grand canonical ensemble (µVT), was validated and applied to evaluate the coadsorption of CO2/H2O, N2/H2O and CH4/H2O for a MOF exposure to the relative humidity of 14, 20, 25, 30 and 40% at 303 K. The gases molecules fill the center of the pores of the Al(OH) fumarate MOF near the aluminum clusters. The water molecules showed a complex behavior, forming clusters even in the early stages of adsorption. The Al(OH)-fumarate MOF, when compared to NaX, shows hydrophobic behavior and impaired in CO2 capacity only at relative humidity above 20%. We also found that CO2 selectivity increases for CO2/N2 and CO2/CH4 as the amount of water increases. We hope that the proposed methodology to study water coadsorption could be applied to other frameworks to assist in the screening of MOF for separation/capture.
      PubDate: 2017-02-22
      DOI: 10.1007/s10450-017-9872-7
       
  • Editorial for the special issue “FOA-12” in “adsorption” by the
           guest editor Andreas Seidel-Morgenstern
    • Authors: Andreas Seidel-Morgenstern
      PubDate: 2017-02-18
      DOI: 10.1007/s10450-017-9876-3
       
  • Nonideal gas modelling of pressure swing adsorption processes
    • Authors: Matthias Stegmaier
      Abstract: Abstract Besides adsorption equilibrium and adsorption kinetics, nonisothermal temperature effects have a high impact on the simulation results and hence on the process design of pressure swing adsorption (PSA) processes. Due to moderate pressures of PSA processes, the gas phase is usually treated as ideal for the ease of solving the underlying model equations. As a consequence, only the ideal gas enthalpy is considered for the energy balance of the gas phase of the adsorber column. Real gas effects like the Joule-Thomson effect or the real gas mixing enthalpy effects are usually neglected. With the simulation package ADLIN, it is possible to model the gas phase in general as real phase in both the material and energy balance while the accuracy is depending on the applied underlying real gas model. The modelling of the adsorbed phase is not subject to this investigation and is modelled in the same manner as usual. On an example of detailed dynamic modelling of high pressure swing adsorption for the purification of hydrogen, the impact of nonideal gas phase vs. ideal gas phase towards the simulation results is shown. Furthermore, additional results of PSA processes are discussed based on the overall material and energy balance of the gas separation process. It turns out that for the simulation of typical hydrogen purification processes by PSA the ideal gas model is usually sufficient to get reasonable results. For high adsorption pressure or methane purification PSA, the nonideal gas simulation results deviate significantly from the ideal gas behavior, and real gas models should be applied for detailed dynamic PSA simulation. Although the capacity of the PSA was generally increased due to the nonideality of the gas phase, the product recovery was generally reduced.
      PubDate: 2017-02-18
      DOI: 10.1007/s10450-017-9877-2
       
  • Using the local adsorption equilibrium distribution based on a Langmuir
           type adsorption model to investigate liquid phase adsorption of sugars on
           zeolite BEA
    • Authors: Dave Hartig; Nadja Schwindt; Stephan Scholl
      Abstract: Abstract Adsorption isotherms generated by the Elution by Characteristic Point Method were used to determine the local adsorption equilibrium distribution (AEqD) on commercial zeolite BEA 150 extrudate pellets at room temperature. The linear sugar alcohol sorbitol and the circular sugar fructose were used as sensor molecules since both showed a rather strong adsorption with a typical type I isotherm. The expectation maximization method was transferred into a MATLAB code to calculate the most probable AEqD explaining the experimental data. The resulting distribution favors a bi-site Langmuir model that is in good agreement with the pore sizes of this zeolite, the critical diameters of the adsorptive molecules and gas phase experiments conducted previously. In summary, both molecules are too big to enter the zigzag channels of the zeolite. Instead they occupy two different binding sites in the straight channels and at the intersections between the straight and the zigzag channels. Therefore, sugars and sugar alcohol can be a good sensor to investigate the interaction between a zeolite crystal and adsorptive molecules in the liquid phase.
      PubDate: 2017-02-17
      DOI: 10.1007/s10450-017-9873-6
       
  • Characterization of hard coal properties applying multiple sorption model
           with parameters determined from qualitative approach to adsorption
           mechanism identification
    • Authors: Grzegorz Stefan Jodłowski; Magda Ziółkowska
      Abstract: Abstract This paper presents results of research on modeling of a coal structure and sorption system properties. Investigations combine a viewpoint on surface heterogeneity, coming from approach aimed at adsorption mechanism identification, when applied to real coal structure in multiple sorption model (MSM) simulations. For imaging of surface heterogeneity in real coal structure two hypothetical models are considered, corresponding to a structure of graphite and active carbon. In particular, adsorbate cohesion energy and volume in adsorption system are estimated modeling selected surface heterogeneity, and employed for determination of corresponding MSM parameters. The newly elaborated MSM simulation procedure is shown and discussed, and the results of its application for analysis of real hard coals properties are shown.
      PubDate: 2017-02-17
      DOI: 10.1007/s10450-017-9869-2
       
  • Adsorption of volatile organic compounds in composite zeolites pellets for
           space decontamination
    • Authors: Guillaume Rioland; Habiba Nouali; T. Jean Daou; Delphine Faye; Joël Patarin
      Abstract: Abstract FAU–*BEA-types zeolites pellets were elaborated with a hydraulic press in the presence of a small amount (5 wt%) of binder [methylcellulose (MC) or anhydrous sodium metasilicate (Na2SiO3)] for molecular decontamination, in particular for the space field. Nitrogen sorption–desorption revealed a small loss of micropore volume (10%) with a compression load of 6 tons (0.24 cm3/g instead of 0.27 cm3/g for the mixture of FAU and *BEA-types zeolites powders), which can be attributed to a partial amorphization. Adsorption kinetics of n-hexane, and cyclohexane showed that the optimum pellets can adsorb volatile organic compounds. For example, FAU–*BEA-type zeolite powder mixture (50 wt% of each zeolite) adsorb 130 mg of n-hexane per g of anhydrous zeolite whereas the pellets made with 5 wt% of MC or Na2SiO3 adsorb about 117–118 mg of n-hexane per g of anhydrous zeolite. These results are coherent with the ones obtained with the cyclohexane and nitrogen adsorption where a small loss of the adsorption capacities was observed.
      PubDate: 2017-02-07
      DOI: 10.1007/s10450-017-9870-9
       
  • Parameters estimability analysis and identification for adsorption
           equilibrium models of carbon dioxide
    • Authors: S. Bedel; C. Vallières; M. A. Latifi
      Abstract: Abstract This research work deals with the modeling of the CO2 adsorption on a commercial adsorbent, based on the temperature dependent Sips and Toth models. In fact, these semi-empirical approaches can properly predict the equilibrium of adsorption of CO2, and more specifically in the case of energetically heterogeneous surfaces. In addition, the investigated adsorption models involve several unknown parameters to be estimated from the available adsorption equilibrium experimental data, measured between 303 and 343 K and up to a CO2 partial pressure of 101 kPa. An estimability analysis was therefore carried out in order to evaluate which parameters are estimable and those that can be fixed either from literature or from previous studies. According to the estimability analysis, whatever the adsorption model which is used, only one over the six unknown parameters is considered as nonestimable. The estimable model parameters are especially the maximum amount adsorbed (qm0), the equilibrium constant (b0), the heterogeneity factors (s0 and t0) assessed at the reference temperature (T0) as well as the constant model parameter (α), which is related to the heterogeneity factors (s and t). The estimable parameters were then identified and their optimized values were used in the comparison of the model predictions and the experimental measurements of CO2 adsorption equilibrium. The results show finally that the model predictions fit well with the experimental data.
      PubDate: 2017-02-06
      DOI: 10.1007/s10450-017-9864-7
       
  • Adsorption thermodynamics and desorption properties of gaseous polycyclic
           aromatic hydrocarbons on mesoporous adsorbents
    • Authors: Ziyi Li; Yingshu Liu; Xiong Yang; Yi Xing; Quan Yang; Ralph T. Yang
      Abstract: Abstract Performances of mesoporous materials in removal of polycyclic aromatic hydrocarbons (PAHs) from hot gases were evaluated systematically. The adsorption and desorption natures for PAHs with different aromatic rings, naphthalene (Nap), phenanthrene (Phe) and pyrene (Pyr) on mesosilicas MCM-41 and SBA-15, and mesocarbon CMK-3, were studied. Adsorption equilibria were well described by Langmuir or Freundlich model, giving the order of adsorption capacity of CMK-3 > SBA-15 > MCM-41 and Pry > Phe > Nap. Temperature programmed desorption exhibited the order of ease of desorption of SBA-15 > MCM-41 > CMK-3, along with desorption kinetic triplet determined by combined model fitting analysis. The Johnson–Mehl–Avrami (JMA) rate equation was found to well describe PAH desorption kinetics, except for Phe/SBA-15 and Pyr/CMK-3 due to potential blockage and strong binding, respectively. MCM-41 with simple 1-D mesoporous structure provided smooth diffusion and consistent behavior but very low adsorption capacity for each PAH. SBA-15 with micropores/small mesopores as interconnectivity between primary mesopores not only showed high sorption capacities but also diffusion advantages in desorption. CMK-3 with great microporosity facilitated the adsorption at low concentrations due to micropore-filling, and with surface hydrophobicity rendered high affinities especially for the bulkier Pyr.
      PubDate: 2017-02-06
      DOI: 10.1007/s10450-017-9863-8
       
  • Adsorption of sulfur dioxide and mixtures with nitrogen at carbon
           nanotubes and graphene: molecular dynamics simulation and gravimetric
           adsorption experiments
    • Authors: Frank G. Kühl; Timur J. Kazdal; Sebastian Lang; Manfred J. Hampe
      Abstract: Abstract The adsorption of sulfur dioxide (SO \(_{2}\) ), nitrogen (N \(_{2}\) ) and mixtures of both on carbon nanotubes (CNTs) and graphene was studied by molecular dynamic simulation. Experimental results from gravimetric adsorption of SO \(_{2}\) and N \(_{2}\) on CNTs are compared to simulated data. CNTs with a rigid and a flexible model and the diameters 1.48 and 2.69 nm were simulated. For graphene, SO \(_{2}\) and N \(_{2}\) rigid models were applied. Besides the CNT diameters, different system temperatures, compositions of SO \(_{2}\) /N \(_{2}\) mixtures were considered for selected cases of CNTs and graphene. By examining the local SO \(_{2}\) and N \(_{2}\) densities on the CNTs and graphene, adsorption could be observed. SO \(_{2}\) shows an enhanced adsorption compared to N \(_{2}\) on both CNTs and graphene. By varying the starting configurations of the simulation, different system pressures could be achieved, which allowed the determination of adsorption isotherms at different temperatures.
      PubDate: 2017-02-03
      DOI: 10.1007/s10450-016-9850-5
       
  • Estimating pore size distributions of activated carbons via optical
           calorimetry
    • Authors: Michelle Wöllner; Matthias Leistner; Philipp Wollmann; Matthias Benusch; Nicole Klein; Wulf Grählert; Stefan Kaskel
      Abstract: Abstract Optical calorimetry is a powerful technique for the characterization of porous materials within only a few minutes (e.g. specific surface area, adsorption capacity). In the current work, optical calorimetry is presented to be a versatile tool for the pore size characterization of activated carbons. Therefore, measurements were performed with six different test gases (N2O, C2H6, C3H8, n-C4H10, i-C4H10, SF6) in the optical calorimeter InfraSORP at ambient conditions. By combining the results of optical calorimetric measurement for each adsorptive, a pore size distribution (PSD) can be estimated in the range of 0.4–6 nm which is in accurate accordance with the PSD of reference CO2 (273 K) and N2 (77 K) physisorption experiments. While common physisorption experiments can easily take a few days, the PSD by using the optical calorimetric screening is obtained within roughly 1 h.
      PubDate: 2017-02-01
      DOI: 10.1007/s10450-016-9852-3
       
 
 
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