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  Subjects -> CHEMISTRY (Total: 765 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (530 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (63 journals)

CHEMISTRY (530 journals)            First | 1 2 3 4 5 6 | Last

Journal of Heterocyclic Chemistry     Hybrid Journal   (Followers: 5)
Journal of Immunoassay and Immunochemistry     Hybrid Journal   (Followers: 3)
Journal of Inclusion Phenomena and Macrocyclic Chemistry     Hybrid Journal   (Followers: 2)
Journal of Inorganic Biochemistry     Hybrid Journal   (Followers: 3)
Journal of Labelled Compounds and Radiopharmaceuticals     Hybrid Journal   (Followers: 1)
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry     Hybrid Journal   (Followers: 4)
Journal of Mass Spectrometry     Hybrid Journal   (Followers: 20)
Journal of Materials Chemistry A : Materials for Energy and Sustainability     Full-text available via subscription   (Followers: 22)
Journal of Materials Chemistry B : Materials for Biology and Medicine     Full-text available via subscription   (Followers: 5)
Journal of Materials Chemistry C : Materials for Optical, Magnetic and Electronic Devices     Full-text available via subscription   (Followers: 6)
Journal of Materials Research     Full-text available via subscription   (Followers: 9)
Journal of Mathematical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Medicinal Chemistry     Full-text available via subscription   (Followers: 143)
Journal of Membrane Science     Hybrid Journal   (Followers: 9)
Journal of Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 1)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 2)
Journal of Molecular Graphics and Modelling     Hybrid Journal   (Followers: 3)
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 3)
Journal of Molecular Recognition     Hybrid Journal  
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 3)
Journal of Nanostructure in Chemistry     Open Access   (Followers: 5)
Journal of Natural Gas Chemistry     Full-text available via subscription   (Followers: 2)
Journal of Nepal Chemical Society     Open Access  
Journal of Nucleic Acids Investigation     Open Access   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 2)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 4)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 148)
Journal of Polymers     Open Access   (Followers: 1)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 2)
Journal of Pure and Applied Chemistry Research     Open Access  
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 12)
Journal of Solution Chemistry     Hybrid Journal  
Journal of Structural Chemistry     Hybrid Journal  
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 2)
Journal of Superhard Materials     Hybrid Journal   (Followers: 1)
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 5)
Journal of Systems Chemistry     Open Access   (Followers: 1)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 231)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 15)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 1)
Journal of the Bangladesh Chemical Society     Open Access  
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal   (Followers: 1)
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 7)
Journal of Theoretical Chemistry     Open Access  
Journal of Wood Chemistry and Technology     Hybrid Journal   (Followers: 7)
JPC - Journal of Planar Chromatography - Modern TLC     Full-text available via subscription   (Followers: 6)
Jurnal Penelitian Sains (JPS)     Open Access  
Jurnal Teknologi Informasi     Open Access   (Followers: 3)
Kinetics and Catalysis     Hybrid Journal   (Followers: 3)
Korea-Australia Rheology Journal     Hybrid Journal  
Langmuir     Full-text available via subscription   (Followers: 35)
Latvian Journal of Chemistry     Open Access   (Followers: 1)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access   (Followers: 1)
Luminescence     Hybrid Journal   (Followers: 1)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 4)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 4)
Macromolecular Research     Hybrid Journal  
Macromolecular Symposia     Hybrid Journal  
Macromolecular Theory and Simulations     Hybrid Journal  
Macromolecules     Full-text available via subscription   (Followers: 31)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 4)
Main Group Chemistry     Hybrid Journal  
Marine Chemistry     Hybrid Journal   (Followers: 4)
Marine Drugs     Open Access   (Followers: 4)
MATEC Web of Conferences     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 21)
Materials Horizons     Full-text available via subscription  
Materials Research Bulletin     Hybrid Journal   (Followers: 15)
Materials Science Monographs     Full-text available via subscription   (Followers: 1)
Materials Science-Poland     Hybrid Journal  
Materials Sciences and Applications     Open Access   (Followers: 4)
MedChemComm     Full-text available via subscription   (Followers: 4)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 10)
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Metallomics     Full-text available via subscription  
Micro and Nano Systems Letters     Open Access   (Followers: 1)
Microchimica Acta     Hybrid Journal   (Followers: 1)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 3)
Modern Research in Catalysis     Open Access   (Followers: 2)
Molbank     Open Access  
Molecules     Open Access   (Followers: 3)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 3)
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 2)
MRS Bulletin     Full-text available via subscription   (Followers: 5)
MRS Online Proceedings     Full-text available via subscription   (Followers: 1)
Nachrichten aus der Chemie     Full-text available via subscription   (Followers: 1)
Nano Convergence     Open Access  
Nano Reviews     Open Access   (Followers: 15)

  First | 1 2 3 4 5 6 | Last

Journal Cover Kinetics and Catalysis
   [5 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3210 - ISSN (Online) 0023-1584
     Published by Springer-Verlag Homepage  [2208 journals]   [SJR: 0.25]   [H-I: 19]
  • New stereoselective        id-i-eq1">        format-t-e-x">\(C_{sp^2 } - C_{sp^3 }\)
           coupling: Catalytic iodomethylation of acetylene with methyl iodide into
           E-1-iodopropene
    • Abstract: Abstract The catalytic addition of methyl iodide to acetylene yielding E-1-iodopropene has been discovered. The reaction competes with the formation of E,E-1,4-diiodobuta-1,3-diene. The key intermediate in these reactions is the methylvinyl derivative of PtIV resulting from acetylene iodoplatination by the PtIV methyl complex forming in the equilibrium process. The \(C_{sp^2 } - C_{sp^3 }\) coupling product in the reductive elimination of the ligands is E-1-iodopropene. E,E-1,4-diiodobuta-1,3-diene is the product of the iodoplatination of the second acetylene molecule by this intermediate followed by the \(C_{sp^2 } - C_{sp^2 }\) coupling of the vinyl ligands.
      PubDate: 2014-05-01
       
  • The novel efficient catalyst for biodiesel synthesis from rapeseed oil
    • Abstract: Abstract The novel efficient procedure has been developed for biodiesel synthesis from rapeseed oil and methanol on the new solid base catalyst with water and acid resistant ability. The catalyst exhibited high activities even for the rapeseed oil with a high water content and acidity. Operational simplicity, low cost and reusability of the novel catalyst, high yields and short reaction time are the key features of this methodology.
      PubDate: 2014-05-01
       
  • Measuring the rate constant of the reaction between carbon monoxide and
           iodine oxide at 298–363 K by the resonance fluorescence method
    • Abstract: Abstract The rate constant of the reaction between the IO radical and carbon monoxide has been measured by the iodine atom resonance fluorescence method in the temperature range from 298 to 363 K. The reaction mainly takes place on the wall of the reactor.
      PubDate: 2014-05-01
       
  • Effect of modifying alumina desiccants with sulfuric acid on their
           physicochemical properties
    • Abstract: Abstract In the production of alumina desiccants by extrusion, the introduction of sulfuric acid at the stage of preparing a mouldable paste based on hydroxides containing bayerite or pseudoboehmite increases the sorption capacity of the product. This effect is most pronounced for the pseudoboehmite-based materials. The dynamic capacity of these desiccants increases to the level characteristic of the bayerite-containing hydroxide (>5 g H2O/100 cm3) for a dew point of −40°C and a contact time of 1.5 s), and their static capacity exceeds this value (increasing from 21.13 to 23.1 g H2O/100 cm3). This procedure changes the phase composition and textural characteristics of the pseudoboehmite-based desiccants and increases Brønsted acidity and generates strong Lewis acid sites on the surface of all oxides. The dynamic capacity of desiccants with similar textural characteristics depends on the acid-base properties of their surface.
      PubDate: 2014-05-01
       
  • Critical condition limits for the high-temperature oxidation of gases on a
           catalyst particle
    • Abstract: Abstract The critical conditions have been analytically determined for the high-temperature oxidation of gases over a catalyst. At certain catalyst particle sizes and in a certain range of surrounding gas temperatures, there are gas autoignition and induced ignition regions provided that the reactor walls remain cold. Inside the autoignition region, there can be a catalytic gas autoignition on the particle surface at any initial temperature of the latter. In the induced ignition region, the catalytic combustion of gases occurs at a catalyst temperature above some critical value. The limiting critical concentrations of the combustible component for gas autoignition and induced ignition have been analytically estimated. A gas temperature effect on the limiting critical conditions and on the parameters at which these conditions undergo degeneration has been revealed for catalyst particles with different emissivities. Depending on the catalyst particle size, the upper boundaries of the gas autoignition and induced ignition regions are determined by the effect of radiative heat loss.
      PubDate: 2014-05-01
       
  • Benzene combustion: A detailed chemical kinetic modeling in laminar flames
           conditions
    • Abstract: Abstract Models resulting from the merging of validated kinetic schemes were used to compile a new detailed mechanism for benzene combustion in laminar flames. The proposed model, featuring 215 species and 1313 reactions, has been validated using fuel-rich, low-pressure, premixed benzene-oxygen-argon flames available in the literature. Good agreement between simulated and experimental data is achieved for the major reactants, intermediates, and products. However, computed maxima for some polyaromatic hydrocarbons were lower than experimental ones.
      PubDate: 2014-05-01
       
  • Heterogeneous acylation of phenol with acetic anhydride over
           hydrotalcite-like compounds
    • Abstract: Abstract Liquid phase acylation of phenol with acetic anhydride was studied over the mixed oxides obtained from Mg-Al, Ni-Al, and Cu-Al hydrotalcites (HTs). The mixed oxides were characterized by XRD and SEM. The main acylation products of phenol over these oxide catalysts are phenylacetate and o-hydroxyacetophenone.
      PubDate: 2014-05-01
       
  • Size effect in the oxidation of platinum nanoparticles on graphite with
           nitrogen dioxide: An XPS and STM study
    • Abstract: Abstract The interaction of NO2 with model catalysts prepared by platinum evaporation onto the surface of highly oriented pyrolytic graphite has been investigated at room temperature and a pressure of 3 × 10−6 Torr by X-ray photoelectron spectroscopy and scanning tunneling microscopy. In the catalyst containing only small (<2.5 nm) platinum particles, these particles oxidize to PtO and PtO2. The action of NO2 on the graphite support and on the graphite-supported Pt catalyst causes graphite oxidation. The oxygen concentration in the model catalyst is higher than on the support. This is supposed to be due to the spillover of oxygen atoms from platinum particles to graphite.
      PubDate: 2014-05-01
       
  • Activity of Au, Ni, and Au-Ni catalysts in the water-gas shift reaction
           and carbon monoxide oxidation
    • Abstract: Abstract Au/Al2O3, NiO x /Al2O3, and (Au + NiO x )/Al2O3 composites have been prepared by ion exchange and impregnation. Their structural and electronic properties, including the size and shape of supported metal particles and the oxidation state and ligand environment of the Au and Ni atoms, have been investigated. The catalytic action of Au/Al2O3, NiO x /Al2O3, and (Au + NiO x )/Al2O3 in the water-gas shift reaction and carbon monoxide oxidation is reported. At 300–450°C, the CO conversion over (Au + NiO x )/Al2O3 exceeds the sum of the CO conversions over the monometallic catalysts Au/Al2O3 and NiO x /Al2O3 by a factor of 2–3. An explanation is suggested for the nonadditive increase in the CO conversion over the Au-Ni catalysts.
      PubDate: 2014-05-01
       
  • Adsorption of NO and CO and specific features of their interaction on the
           Pt(100) surface
    • Abstract: Abstract This article presents an analytical review of the author’s results and the literature concerning the nature of species resulting from NO and CO adsorption on the unreconstructed (1 × 1) and reconstructed hexagonal (hex) Pt(100) surfaces, including specific features of the reactions between these species. At 300 K, both surfaces adsorb NO and CO mainly in their molecular states. When adsorbed on Pt(100)-1 × 1, the NOads and COads molecules are uniformly distributed on the surface. Under the same conditions, the hexagonal surface undergoes adsorption-induced reconstruction with the formation of NOads/1 × 1 and COads/1 × 1 islands, which are areas of the unreconstructed phase saturated with adsorbed molecules and surrounded with the adsorbate-free hex phase. In adsorption on structurally heterogeneous surfaces containing both hex and 1 × 1 areas, the 1 × 1 and hex phases are occupied in succession, the latter undergoing reconstruction into the 1 × 1 phase. The reaction between NO and CO on the unreconstructed surfaces occurs even at room temperature and results in the formation of N2 and CO2 in quantitative yield. On the hexagonal surface, a stable layer of adsorbed molecules as (NOads + COads)/1 × 1 mixed islands forms under these conditions. Above 350 K, the reaction in the mixed islands is initiated by the desorption of small amounts of the initial compounds, and this is followed by rapid self-acceleration leading to a surface explosion yielding N2, CO2, and N2O (minor product). These products show themselves as very narrow desorption peaks in the temperature-programmed reaction spectrum.
      PubDate: 2014-05-01
       
  • Carbon deposits on a resistive FeCrAl catalyst for the suboxidative
           pyrolysis of methane
    • Abstract: Abstract The carbon deposits forming upon the suboxidative pyrolysis of methane on resistive FeCrAl catalysts heated with electric current were studied. The suboxidative pyrolysis of methane was carried out in a flow reactor at the ratio CH4: O2 = 15: 1 in a catalyst-coil temperature range of 600–1200°C; a cold reaction mixture (∼20°C) was supplied. The morphology and structure of the carbon deposits and changes in the composition and structure of the catalyst were characterized by scanning electron microscopy, transmission electron microscopy with EDX analysis, Raman spectroscopy, and X-ray diffraction analysis. Various forms of carbon deposits, including branched nanotubes, and metal carbides formed by catalyst constituents were detected. It was found that the carbon deposits on the catalyst surface were morphologically different from the deposits on quartz reactor walls. The reasons for these differences were considered.
      PubDate: 2014-05-01
       
  • Synthesis and physicochemical and catalytic properties of apatite-type
           lanthanum silicates
    • Abstract: Abstract Undoped and aluminum-doped lanthanum silicates with an apatite structure have been synthesized using mechanical activation, and their structure, microstructure, and catalytic properties in the oxidative coupling of methane have been investigated. The phase composition, structure, and microstructure of the silicates have been determined by X-ray diffraction, IR spectroscopy, X-ray photoelectron spectroscopy, low-temperature nitrogen adsorption, and scanning and transmission electron microscopy. The catalytic activity of silicates have been investigated in a catalytic flow reactor at 700–800°C, a CH4: O2 molar ratio of 3.8: 1 in the feed, and a residence time of 0.04 s. The catalytic properties of apatite-type lanthanum silicates can be tuned by varying the number of cationic vacancies and/or interstitial oxygen ions through isomorphic substitution of atoms with a smaller oxidation number for silicon in the apatite lattice.
      PubDate: 2014-05-01
       
  • Development of VPO catalysts supported on mesoporous modified material
           based on an aerosil gel
    • Abstract: Abstract Supports modified with different organic substances and vanadium-phosphorus oxide catalysts on their basis were developed with the use of the barothermal treatment of aerosil. It was found that the anchoring of a modifier to the surface of a support occurred with the participation of OH groups. The modifier content found from differential thermal analysis data depended on the pore structure of the support and the nature of the modifier. It was demonstrated that, with the use of a modified support in the catalysts, a vanadyl hydrogen phosphate hemihydrate phase—the precursor of a catalyst for the selective oxidation of hydrocarbons—was formed; under reaction conditions, this precursor was converted into vanadyl pyrophosphate. On supporting, the phase grew from the micropore bulk and covered only part of the support surface. The synthesized catalysts exhibited high activity and selectivity in the reaction of n-butane oxidation under hydrocarbon-rich conditions and also in the oxidative dehydrogenation of ethane.
      PubDate: 2014-05-01
       
  • Ni-based catalyst derived from Ni/Mg/Al hydrotalcite-like compounds and
           its activity in the methanation of carbon monoxide
    • Abstract: Abstract The supported Ni-based catalyst is widely used in the methanation process. Nevertheless, the major disadvantages of this catalyst are a poor behavior in the water-gas-shift (WGS) reaction and the deactivation at higher temperatures. A new kind of catalyst, nickel-containing oxides catalyst (NiMgAl), obtained from thermal treatment of hydrotalcite-like compounds (HTlcs) was prepared using the co-precipitation method. The performance of this catalyst was systematically investigated and compared with that of the Ni/Al2O3 catalyst. It was found that the NiMgAl catalyst shows an enhanced methanation activity compared to that of the Ni/Al2O3 catalyst and the former catalyst shows a better performance for the methanation especially at temperature over 550°C. Three NiMgAl catalysts with different nickel content were prepared and tested in the methanation operated at a GHSV of 15000 h−1 and n(H2)/n(CO) of 1.5. The results indicate that with the NiMg8 catalyst a higher activity and stability could be achieved than with the NiMg5 and NiMg6 samples, the effect mainly attributed to a higher extent of Ni dispersion was confirmed by XRD results.
      PubDate: 2014-03-01
       
  • Hydrodesulfurization catalysts P-Mo-W/γ-Al       class="a-plus-plus">2O       class="a-plus-plus">3: Characterization and
           catalytic activity
    • Abstract: Abstract P-Mo-W/γ-Al2O3 catalysts with various Mo and W contents have been synthesized. The parameters of the porous structure of their sulfide and oxide forms have been determined. The geometric parameters of the active phase of the sulfide catalysts have been calculated using high-resolution transmission electron microscopy data. The catalytic activity has been estimated in dibenzothiophene (DBT) hydrodesulfurization (HDS). The reaction under the conditions examined proceeds mainly as direct hydrodesulfurization. The catalytic activity has been correlated with the Mo/W molar ratio and with the proportions of edge and corner sites.
      PubDate: 2014-03-01
       
  • Photocatalytic oxidation of pharmaceuticals on thin nanostructured Zinc
           Oxide films
    • Abstract: Abstract The photocatalytic activity of thin ZnO films in the photocatalytic oxidation of the pharmaceuticals, paracetamol and chloramphenicol (Levomycetin) is reported. The films annealed at 500°C exhibit the highest activity. They have a wurtzite-like structure and consist of conducting branches, which are the spinodal decomposition products.
      PubDate: 2014-03-01
       
  • Sulfonated carbon nanocage as a catalyst for the per-O-acetylation of
           carbohydrates
    • Abstract: Abstract We report an efficient per-O-acetylation of carbohydrates. The use was made of the sulfonated carbon nanocage with high specific surface area and uniform mesoporous structure as a recyclable heterogeneous catalyst. This protocol eliminates the need to involve pyridine and provides products in good to excellent yields.
      PubDate: 2014-03-01
       
  • Kinetics of ethylbenzene oxy-chemiluminescence in the presence of
           antioxidants from tissues of the marine invertebrate        class="a-plus-plus">Eupentacta fraudatrix:
           Estimating the concentration and reactivity of the natural antioxidants
    • Abstract: Abstract Extracts from tissues of the holothuria Eupentacta fraudatrix suppress the oxy-chemiluminescence of ethylbenzene in chlorobenzene initiated by azobisisobutyronitrile thermolysis and enhanced by energy transfer to 9,10-dibromoanthracene. The decrease of the chemiexcitation rate in the reaction between peroxyl radicals is caused by radical interception by the antioxidants contained in the extracts. The concentrations of the antioxidants in the extracts and the rate constants of their reactions with peroxyl radicals have been estimated from chemiluminescence kinetics.
      PubDate: 2014-03-01
       
  • Optimal process conditions for zeolite catalyzed acylation of anisole
    • Abstract: Abstract Acylation of anisole is a commercially important reaction in the production of various fine chemicals, agrochemicals, pharmaceuticals and fragrances. Conventionally, it is carried out using the catalysts like AlCl3, FeCl3, ZnCl3, HF, which suffer from major drawbacks such as larger consumption, corrosion and safety issues, waste disposal and the material handling. Hence the conventional catalysts are being replaced with solid acid catalysts like H-Beta, H-ZSM5 to overcome the above drawbacks. In this work, liquid phase acylation of anisole has been carried out employing H Beta, H ZSM-5 and HY catalysts and the process standardization at a macrolevel has been done with reference to parameters like temperature, reaction time, molar ratio of reactants, catalyst nature, Si/Al ratio of catalyst and the catalyst quantity. In addition, catalyst stability was investigated.
      PubDate: 2014-03-01
       
  • Mathematical modeling of styrene and butyl acrylate homopolymerization via
           the reversible addition-fragmentation mechanism
    • Abstract: Abstract A mathematical model is suggested for the kinetics of the controlled free-radical polymerization of two monomers—styrene and butyl acrylate—via the reversible addition-fragmentation chain transfer (RAFT) mechanism (with 2,2′-azobisisobutyronitrile as the initiator and dibenzyl trithiocarbonate as the RAFT agent). A comparison of experimental molecular weight characteristics of polystyrene and poly(butyl acrylate) with those calculated using the model indicates that the model is valid. The effects of the process control parameters (temperature and the initial concentrations of the initiator, monomer, and RAFT agent) have been elucidated by a computational experiment.
      PubDate: 2014-03-01
       
 
 
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