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CHEMICAL ENGINEERING (235 journals)            First | 1 2     

Showing 201 - 236 of 236 Journals sorted alphabetically
Nanochemistry Research     Open Access   (Followers: 1)
Natural Volatiles & Essential Oils     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
npj Science of Food     Open Access  
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Open Chemical Engineering Journal     Open Access  
Periodica Polytechnica Chemical Engineering     Open Access  
Petroleum Chemistry     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Plasma     Open Access   (Followers: 3)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Polymer     Hybrid Journal   (Followers: 86)
Polymer Bulletin     Hybrid Journal   (Followers: 6)
Polymer Composites     Hybrid Journal   (Followers: 18)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 13)
Reaction Chemistry & Engineering     Hybrid Journal  
Reactions     Open Access  
Research on Chemical Intermediates     Hybrid Journal   (Followers: 3)
Revista Cubana de Química     Open Access  
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Russian Chemical Bulletin     Hybrid Journal   (Followers: 3)
Russian Journal of Applied Chemistry     Hybrid Journal  
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 3)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
Sustainable Chemical Processes     Open Access   (Followers: 3)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 3)
Transition Metal Chemistry     Hybrid Journal   (Followers: 6)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Upstream Oil and Gas Technology     Open Access   (Followers: 1)
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 1)

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Petroleum Chemistry
Journal Prestige (SJR): 0.31
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0965-5441 - ISSN (Online) 1555-6239
Published by Springer-Verlag Homepage  [2469 journals]
  • Nanocrystalline Materials of MFI Structure: Synthesis in a Fluorinated
           Surfactant Medium and Acidity Characterization

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      Abstract: Approaches to the development of submicron and nanocrystalline silicate materials of MFI structure in a fluorinated surfactant medium were studied with perfluorononanoic acid as an example. In fluorinated surfactants, the crystal structure of the zeolite framework is formed more slowly than in the case of silicalite-1 because of the presence of aluminum atoms. The fractions of the formed Brønsted and Lewis acid sites in zeolites are independent of the amount of aluminum introduced into the reaction mixture. In oligomerization of light alkenes, the activity and operation stability of the synthesized zeolite with lower concentration of Brønsted acid sites and smaller crystal size are similar to those of the commercially available catalyst.
      PubDate: 2022-08-01
       
  • Effects of Reaction Conditions on Synthesis of Butadiene from Formaldehyde
           and Propylene

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      Abstract: This study investigated the effects of reaction conditions in a one-step gas-phase synthesis of butadiene from formaldehyde and propylene over a SiO2-supported silicotungstic heteropoly acid catalyst. The physicochemical properties of the catalyst were examined by X-ray fluorescence spectroscopy, low-temperature nitrogen adsorption, XRD, SEM, and NH3–TPD. It was found that, with increase in reaction temperature, the yield of butadiene passes through its maximum. Increasing the WHSV of the reactant feed lowers the formaldehyde conversion and enhances the butadiene selectivity. Raising the propylene to formaldehyde molar ratio increases the formaldehyde conversion, with the butadiene selectivity passing through its maximum. Finally, diluting the reactants with an inert gas barely affects the process performance.
      PubDate: 2022-08-01
       
  • Forming of Block Zeolites Using 3D Printing Technology

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      Abstract: Zeolite blocks with 10% binder and without binder were formed using 3D printing technology. A polylactide template with the preset shape and structure of channels was printed on a 3D printer. The zeolite material was formed in the voids of this template. Finally, the template was burned out from the final block. Blocks with a binder were prepared by filling the template with a paste containing microcrystalline zeolite of MFI structural type. Blocks without binder were prepared by steam-assisted crystallization leading to the formation of zeolite nanocrystals in the H-form in the template channels. A relatively strong block consisting of MFI-type zeolite and reproducing the polymer template void volume was obtained.
      PubDate: 2022-08-01
       
  • Highly Porous Materials as Potential Components of Natural Gas Storage
           Systems: Part 2 (A Review)

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      Abstract: This review discusses the challenges of the preparation and investigation of adsorbents for high-performance and safe operation of natural gas (methane) storage/delivery systems. Currently, researchers have been paying increasing attention to coordination polymers distinguished by developed surface, very high porosity, and adjustable porous structure. This part, Part 2, of the review provides an analysis of the current state of research on the development of methane adsorbents based on highly porous metal–organic and covalent organic framework materials, hybrid composites, and a number of other structures. Emphasis is placed on modification methods for these materials, their structural design, and fine-tuning of pore size for the most efficient use of their nanoporous space for methane storage.
      PubDate: 2022-07-20
       
  • Mechanism and Performance Investigation of SBS/Sulfur Composite Modified
           Asphalt

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      Abstract: To improve the performance of asphalt, the modified asphalt was prepared by adding styrene-butadiene-styrene block copolymer (SBS) and sulfur powders into the base asphalt. The storage behavior of asphalts was tested to optimize the quality of adding SBS and sulfur. The storage stability and viscoelastic properties of modified asphalts were also studied. The results showed that under the proportioning final addition of SBS and sulfur, the storage stability, the high and low-temperature performance of asphalt was greatly improved, making it possible to meet the stability requirements for high-temperature storage of asphalt. Additionally, only a small amount of acidic sulfur-containing gas such as H2S escaped during the modification process. The microscopic observation showed that the “sea-islands” form of SBS-modified asphalt was changed to a uniform and continuous dual-phase structure after sulfur addition. Finally, it was proposed that sulfur induced the chemical reaction between SBS and asphalt to form a stable network structure, which was the intrinsic mechanism to improve the performance of asphalt.
      PubDate: 2022-07-18
       
  • Hydrostabilization of Straight-Run Naphtha Pyrocondensate in the Presence
           of a Nickel–Chromium Catalyst

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      Abstract: Hydrostabilization of straight-run naphtha pyrolysis condensate in the presence of a commercial nickel–chromium catalyst at 80–120°С, hydrogen-to-feed ratio of 0.3–0.8 m3/L, and process time of 30– 120 min was studied. The hydrostabilized pyrocondensate yield increases with an increase in the hydrogen content. The degree of hydrogenation has pronounced temperature dependence at a low-hydrogen hydrogen-to-feed ratio, whereas with an increase in this ratio the temperature dependence levels off. A detailed study of the fractional and component composition of the hydrostabilized pyrocondensate revealed significant differences in the catalyst selectivity depending on the reaction conditions. Low process temperature and high hydrogen-to-feed ratio favor intense formation of aromatic hydrocarbons (at 100°С and hydrogen-to-feed ratio of 0.8 m3/L, the yield was 82 wt %), whereas at elevated temperatures and low hydrogen content the formation intensity shifts toward isoparaffins (at 120°С and 0.5 m3/L H2, the yield was 32 wt %). A possible hydrogenation mechanism ensuring the selectivity of the nickel–chromium catalyst in the process was outlined. The parameters of the fractional and hydrocarbon compositions and the octane numbers of the distillates obtained allow them to be suggested as components of motor fuels.
      PubDate: 2022-07-18
       
  • Structural Characteristics and Interfacial Properties of n-Hexane- and
           n-Heptane-Asphaltenes

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      Abstract: In this study, n-hexane-asphaltenes (X–A) and n-heptane-asphaltenes (P–A) were separated and collected by n-hexane and n-heptane respectively. The two asphaltenes were divided into six subfractions (A1–A6) by the mixed solvent (toluene/n-hexane or toluene/n-heptane). The differences between X–A and P–A were studied and the differences between subfractions were compared. And the effects of X–A, P–A and subfractions on oil-water interfacial tension (IFT) were evaluated. The content and polarity of X–A are greater than that of P–A. The ability of X–A reducing oil/water IFT is stronger than that of P–A. The structures of X–A and P–A were simply speculated by the improved B–L method (Bitumen–Liquid product method is used to calculate structural parameters). Both P–A and X–A are cata-condensed and they are mainly tricyclic-aromatics. Moreover, X–A is a kind of high condensation aromatic polymer with regular arrangement, short alkyl chains, low rigidity and more naphthenic rings. P–A is a kind of high condensation aromatic polymer with poor arrangement regularity, long alkyl chains, large rigidity, more aromatic rings but slightly less condensation degree than X–A.
      PubDate: 2022-07-18
       
  • Kinetics of Liquid-Phase Condensation of Propylene with Formaldehyde over
           H–MFI and H–BEA Zeolites

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      Abstract: This study investigated the kinetic patterns of the liquid-phase Prins condensation of propylene with formaldehyde in the range of 120–180°C over H–MFI and H–BEA zeolites. The apparent reaction order with respect to formaldehyde was found to vary between 0.1 and 0.2 for H–BEA and to be close to zero for H–MFI. The apparent activation energy for H–MFI and H–BEA was 26.1±0.6 kJ/mol and 20.0±4.0 kJ/mol, respectively. Based on these results, the reaction was demonstrated to occur in the intradiffusion or transition region; the calculated Thiele modulus and effectiveness factor further confirmed this fact. The diffusion limitations were partially removed by raising the initial formaldehyde concentration, as indicated by an increase in the apparent order of formaldehyde conversion to 1.0 for H–BEA and to 0.4 in the H–MFI case. To describe the substrate transformations observed, a modernized reaction mechanism was proposed.
      PubDate: 2022-07-07
       
  • Evolution of Aggregate-Like ZSM-5 Crystals

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      Abstract: A series of zeolites ZSM-5 has been synthesized in hydrothermal conditions at 160°C by varying the time of HT treatment with the following molar compositions of the precursor gel: 1.0 SiO2 : 0.01 Al2O3 : 0.2 ТPAОН : 0.05 Na2O : 50 H2O : 4.0 EtOH. Materials have been characterized by X-ray diffraction, transmission electron microscopy and nitrogen adsorption measurements. We have succeeded to synthesize ZSM-5 crystals with metastable aggregate-like morphology reproducibly and to follow their evolution during HT treatment.
      PubDate: 2022-07-07
       
  • Catalytic Disproportionation of Ethylbenzene over Ln-Modified HZSM-5
           Zeolites

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      Abstract: A series of lanthanide (Ln) modified zeolites, Pr/HZSM-5, Gd/HZSM-5, Ho/HZSM-5, and Yb/HZSM-5 have been prepared and characterized by XRPD, IR, and atomic absorption spectroscopies. In Ln/HZSM-5, concentration of the Brønsted acid sites decreases with the increase of ionic radii of Ln (Pr > Gd > Ho > Yb) and with the Ln loading, while concentration of the Lewis acid sites increases. The conversion of EB and production of diethylbenzenes (DEBs) over the Ln/HZSM-5 catalysts and parent HZSM-5 have been studied using a flow fixed-bed reactor; the reaction temperature was varied from 300 to 450°C. The m-DEB and p-DEB isomers are the main products at the studied conditions. The highest yield of DEBs of ca. 22.2% (7.8% m-DEB and 14.4% p-DEB) with EB conversion of 42.4% was obtained over 5 wt % Yb-HZSM-5 catalyst at 400°C.
      PubDate: 2022-07-07
       
  • Hydrogen Energy: Significance, Sources, Problems, and Prospects (A Review)

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      Abstract: According to the estimates made in this paper, neither hydropower and nuclear power engineering nor, the more so, other renewable power sources are capable in principle to ensure the commercial hydrogen production volumes required for noticeable reduction of the global carbon dioxide emission. Before mastering the thermonuclear synthesis energy, only the conversion of hydrocarbons can be the real source of hydrogen for commercial power generation. Therefore, making these processes more efficient is the best way to reduce the carbon footprint of the power generation. It should also be noted that hydrogen as a power carrier has serious drawbacks, the main of which is the low volumetric energy content. Transportation and storage of hydrogen, compared to natural gas, are considerably more money- and power-consuming. The most feasible way to overcome the yet unsolved problems of hydrogen storage and transportation is to set up decentralized low-tonnage production of hydrogen directly on the consumption sites. Such technologies have been already developed in Russia, and active efforts should be made to implement them.
      PubDate: 2022-06-03
       
  • ZSM-5/Fe3O4 and ZSM-5/Fibrous Cellulose as Two Durable and Recyclable
           Adsorbents for Efficient Removal of Asphaltenes from Crude Oil

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      Abstract: Asphaltenes are one of the heaviest fractions of crude oil, which causes it to settle and deposit into the reservoir rock or extraction and transfer pipes. So far, various methods have been proposed to separate or remove asphaltenes, and among them, the adsorption of asphaltenes using nanoparticles is one of the most efficient method. In this way, two strong, durable, and recyclable adsorbents towards adsorption of asphaltenes from crude oil were synthesized by incorporation of Fe3O4 and fibrous silica (KCC-1) nanoparticles (NPs) into ZSM-5 zeolite nanocrystals. Structural, physical and surface characteristic properties of the adsorbents were studied by FTIR, XRD, VSM, BET, FE-SEM, and TEM analyses. In order to optimize the asphaltenes adsorption process, the effect of some parameters such as asphaltenes concentration, temperature and the amounts of adsorbents was studied. The asphaltenes adsorption isotherms were suitably correlated to the Langmuir model for ZSM-5/Fe3O4 as well as ZSM-5/KCC-1 nanoparticles, which suggests the monolayer adsorption of asphaltenes onto the nanoparticles through a self-association as assumed in the literature. Kinetic results showed that asphaltenes is rapidly adsorbed by the nanoparticles within about 2 h. By comparing the quasi-first-order and quasi-second-order kinetic models, it was found that the quasi-second-order kinetic model well predicts the adsorption kinetic of the asphaltenes on each of the ZSM-5/ Fe3O4 and ZSM-5/ KCC-1 nanoparticles.
      PubDate: 2022-06-03
       
  • Rhodium-Containing Mesoporous Aromatic Frameworks as Catalysts for
           Hydroformylation of Unsaturated Compounds

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      Abstract: Heterogeneous catalysts for hydroformylation of unsaturated compounds, consisting of rhodium nanoparticles immobilized in the pores of mesoporous aromatic frameworks based on tetraphenylmethane (PAF-20, PAF-20–NH2), were synthesized. The resultant materials were characterized by X-ray photoelectron spectroscopy (XPS), atomic absorption spectroscopy (AAS), and transmission electron microscopy (TEM). The rhodium content in the PAF–Rh and PAF–NH2–Rh samples synthesized was found to be 2.33 and 2.57%, respectively. The obtained catalysts exhibited high catalytic activity in hydroformylation of a number of C6–C12 linear alkenes; the yield of aldehydes at a pressure of 3.0 MPa after 6 h ranged from 50 to 70%. Reusability of the catalysts synthesized was demonstrated.
      PubDate: 2022-06-03
       
  • Catalytic Effects of Fe3O4/GLC Nanocomposites for Pyrolysis of Heavy Oil

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      Abstract: The paper studied the effects of Fe3O4 nanoparticles loaded biomass-derived carbon (Fe3O4/GLC) from ginkgo leaf on catalytic pyrolysis of heavy oil for the first time, and which was synthesized via green and low-cost ball milling method. The properties of Fe3O4/GLC were characterized by XRD, SEM, EDS, TEM, XPS. The experimental results showed that the viscosity of heavy oil may be decreased by 79.06% under optimal pyrolytic conditions of 350°C, 30 min and 0.05 wt % catalyst, and the viscosity reduction rate increased by 18.93% compared with pyrolysis alone. The property of the used catalyst was consistent with the new catalyst by XRD analysis. It was suggested that the catalyst had high activity and high stability for catalytic upgrading and viscosity reduction of heavy oil.
      PubDate: 2022-06-01
       
  • Highly Porous Materials as Potential Components of Natural Gas Storage
           Systems: Part 1 (A Review)

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      Abstract: This review provides an analysis of recent research data on the development of adsorbents for high-performance adsorbed natural gas storage systems. This is Part 1 of the review and describes the requirements for potential methane adsorbents. Carbon materials are shown to possess a variety of properties suitable for natural gas storage applications. The paper discusses various works focused on the generation and improvement of the adsorption properties of highly porous carbon materials, including activated carbons, carbon fibers, nanoporous spheres, and graphene-based composites. This discussion is strongly focused on methods employed to enhance the methane adsorption capacity of carbon adsorbents, particularly by developing their porous structure, functionalizing, increasing their density, and creating composites based on these adsorbents.
      PubDate: 2022-06-01
       
  • Prospects for Membrane Deoxygenation of Alkanolamine CO2 Solvents to
           Prevent Their Degradation (A Minireview)

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      Abstract: Absorption by aqueous solutions of alkanolamines is the most mature technology for removing carbon dioxide (СО2) from natural gas, off-gases from power engineering, and other mixtures. The possible presence of oxygen in the gas mixture being treated or air leakage into the absorption treatment system leads to oxidative degradation of the amine and deactivation of the absorption liquid with the formation of a wide range of corrosion-active degradation products. The paper discusses modern views on the effect of dissolved oxygen on the degradation of amine solvents. The main methods for preventing oxidative degradation of alkanolamines and fighting against it are described. Direct removal of oxygen (deoxygenation) from absorption liquids in compact and modular membrane gas–liquid contactors is suggested as an alternative countermeasure. The retrospective and state-of-the-art of membrane deoxygenation of aqueous media are presented. Advanced studies in the field of oxygen removal from amine СО2 solvents used for flue gas treatment are described.
      PubDate: 2022-06-01
       
  • Composition and Preparation Method of Rhenium- and Tungsten-Containing
           Porous Ceramic Converters Influence on the Cumene Dehydrogenation to
           α-Methylstyrene Process Specific Features

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      Abstract: The latest research results on the specific features of the process of cumene dehydrogenation to α-methylstyrene (AMS) on the porous ceramic catalytic converters were presented. The influence of the method of formation of the mono- and bimetallic rhenium- and tungsten-based components on the activity and selectivity of the synthesized converters was evaluated. It was found that the monometallic tungsten-containing converter obtained by combining self-propagating high-temperature synthesis (SHS) with the sol-gel process has the optimal composition. The experiments showed that, for this converter, the temperature range of effective operation is 550–600°C. In this range the space-time yield of AMS reached 14% at a maximum productivity of 20.57 g h–1 dm–3. The degree of carburization of the sample after 6 h of the experiment did not exceed 5 wt %, indicating its high resistance against coking.
      PubDate: 2022-06-01
       
  • Reactive Adsorption Desulfurization of Olefin-Containing Feedstocks over
           Ni/ZnO–Al2O3 Adsorbents: Effects of ZnO–Al2O3 Support Composition

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      Abstract: Several adsorption-catalytic systems have been synthesized, which are different by the composition and method of the support preparation. The composition and physicochemical characteristics of the synthesized composites were studied using nitrogen porosimetry, inductively coupled plasma atomic emission spectroscopy, X-ray diffraction, and transmission electron microscopy. The desulfurization depth and the hydrodesulfurization selectivity concerning the hydrogenation reaction (HDS/HYD selective factor) were evaluated in the reactive adsorption of model FCC gasoline containing thiophene (2630 ppm) and hexene-1 (20 wt %) on a fixed-bed flow unit. It has been established that a desulfurization depth of >99% at the chemisorption stage is achieved at a temperature of 400°C, a pressure of 0.5 MPa, and a WHSV of 5.2 h–1 on a Ni/ZnO@Al2O3 adsorption-catalytic system synthesized by coprecipitation and subsequent incipient wetness impregnation. For Ni/(ZnO)Al2O3 adsorption-catalytic systems, it was shown that an increase in the Ni particles’ average size leads to an increase in HDS/HYD selectivity at the chemisorption stage.
      PubDate: 2022-06-01
       
  • Direct Catalytic Oxidation of Propane: Effects of Inhibitors

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      Abstract: This study investigated the effects of ionol (2,6-di-tert-butyl-4-methylphenol) and CCl4 as inhibitors of radical reactions in propane oxidation with oxygen in the presence of co-reductants. These compounds inhibit the activity of a Pd/C–FeSO4–H2 catalytic system. Homogeneous catalytic systems based on Pd or Rh compounds, cocatalysts, and co-reductants promote molecular mechanisms for the reaction. The only exception is a Pd(α,α-bipy)Cl2–FeSO4–CO system, in which both ionol and CCl4 act as inhibitors.
      PubDate: 2022-06-01
       
  • High-Performance Heterogeneous Oxidative Desulfurization Catalyst with
           Brønsted Acid Sites

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      Abstract: A new heterogeneous catalyst containing two types of active sites, sulfo group and ammonium heptamolybdate, on ASKG silica gel support was synthesized. The influence of oxidation conditions (temperature, reactant ratio, reaction time) on the conversion of a model substrate, dibenzothiophene (DBT), was examined. Conditions were found for exhaustive oxidation of DBT. The catalyst synthesized is stable under the oxidation conditions and preserves its activity in five oxidation cycles. The combination of two types of active sites not only considerably enhances the catalyst performance but also reduces to a minimum the possible washout of molybdenum compounds from the support surface.
      PubDate: 2022-06-01
       
 
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