Applied Catalysis A General (APPL CATAL A-GEN )

Publisher: Elsevier


Scientific understanding of any catalytic phenomena. Phenomena of relevance to current industrial processes, processes under industrial development or of interest for future commercial applications are particularly welcome. Both heterogeneous and homogeneous catalysis are included. Scientific aspects of preparation, activation, aging, deactivation, rejuvenation, regeneration and start-up transient effects of commercially interesting or representative model catalysts. Scientific methods of characterization of catalysts, especially if they are applicable to industrial catalysts. Chemical engineering aspects relevant to an improved understanding of catalytic phenomena or application to catalysis. Results involving a joint approach by chemical engineering and catalytic science are particularly welcome. New catalytic reactions, catalytic routes and processes of potential practical interest. The journal will accept original letters, research papers and reviews. A News Brief section contains information on new scientific facts related to the application of catalysis (new reactions, catalysts, processes, etc.). It also contains reports on technical perspective of historic developments in catalysis, book reviews and calendar of forthcoming events Applied Catalysis B: Environmental will publish papers covering all aspects of environmental catalysis. Since the scope of Elsevier journals of Applied Catalysis A and B and Journal of Molecular Catalysis are complementary, an appropriate choice for submission to any journal could be borderline, in which case the advice of the editors should be sought.

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    Applied Catalysis A: General website
  • Other titles
    Applied catalysis
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    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

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    ​ green

Publications in this journal

  • Applied Catalysis A General 08/2014;
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    ABSTRACT: Pore engineered ZSM-5 zeolite in extrudate form was prepared and used as shape-selective catalyst for vapor phase ethylation of ethylbenzene to selectively form para-diethylbenzene. The physico-chemical properties of the catalyst were established by XRD, N2 sorption, FTIR, FESEM, NH3-TPD and 31P MAS NMR. Alkylation of ethylbenzene with ethanol was carried out in a continuous, down-flow, tubular reactor, at atmospheric pressure and H2 as a carrier gas in vapor phase. Effect of silica to alumina ratio (SAR), crystal size, acidity of phosphate modified ZSM-5, stepwise phosphate modification and reaction conditions were studied in detail. ZSM-5 with SAR 187 was found to contain optimum acidity for phosphate modification to achieve good conversion and high selectivity for p-diethylbenzene. Under optimized reaction conditions, viz. temperature = 380 °C, ethylbenzene:ethanol mole ratio = 4:1, WHSV = 3 h−1, H2/reactants = 2, 5PZSM-5 W catalyst gave 22.8% of ethylbenzene conversion with ∼98% selectivity for para-diethylbenzene.
    Applied Catalysis A General 08/2014; 484:8-6.
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    ABSTRACT: A highly efficient method for the synthesis of cyclic carbonates from carbon dioxide and epoxides in the presence of polymer-supported quaternary onium salts (PS-Q+X−) and aqueous solution of metal salts under mild conditions, is described. In comparison with conventional homogeneous catalysts, immobilized tributylmethylammonium chloride (PS-TBMAC) is a recyclable, effective catalyst for the studied reaction. The presence of an aqueous solution of zinc iodide as a co-catalyst enhances significantly the catalytic activity of PS-TBMAC. Using this two-component catalyst system (polymer-supported quaternary onium salts and aqueous solution of metal salts), the reaction of CO2 with selected epoxides can be conducted with high product yield (71–91%) and selectivity (97–99%) under mild reaction conditions (temperature 110 °C and initial CO2 pressure 0.9 MPa). Propylene carbonate was obtained in the best yield (91%). In addition, the advantages of this method include a short reaction time, solvent-free conditions, and an easy separation of catalyst system.
    Applied Catalysis A General 07/2014; 482:266–274.
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    ABSTRACT: Two sets of Pd/C catalysts with 1–10 wt.% Pd content supported on active carbon were prepared by a conventional formaldehyde method. One set was prepared using H2[PdCl4] complex and other one with Na2[PdCl4]. In spite of different metal loadings, average crystallite size of palladium particles estimated by XRD and TEM analyses was virtually the same in all the cases, from 3 to 5 nm. Catalysts were tested for nitrobenzene hydrogenation in a stirred autoclave with the presence of methanol as a solvent, at 5 MPa and 50 °C. Ratio of Pd to nitrobenzene substrate was in every reaction mixture the same: 15.4 mg of palladium per mol of nitrobenzene. Specific initial catalyst activity (initial reaction rate) for catalysts with 1–4 wt.% Pd content for both sets of catalysts was comparable. It means that palladium complex used for the preparation had no-effect on catalyst activity. With palladium content higher than 4 wt.% a significant drop in the catalytic activity and increase in amount of the leached palladium were observed, which should be prescribed for the formation of agglomerates of palladium crystallites (revealed by TEM) and consequent decrease in concentration of catalytic sites. Because of a decrease in catalytic activity, the reaction times were longer, which caused a higher metal leaching.
    Applied Catalysis A General 04/2014; 476,:103–112.
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    ABSTRACT: Lipase immobilized biocatalysts were prepared via enzyme binding onto functionalized surface of magnetic micro-/nano-particles. In order to achieve an efficient biocatalytic composite the immobilization parameters (e.g. lipase concentration, pH of the immobilization phase, activation reagent) were correlated with support morphology and type of the functional group on the support surface. The characterization of the lipase-particle composites was made using FTIR and UV–Vis techniques. The biocatalyst activity was evaluated in the transesterification reaction of glycerol with DMC (dimethyl carbonate). Under solvent-free conditions the conversion of glycerol was of 48.6% with the selectivity in glycerol carbonate (GlyC) of 85%. The biocatalyst composites were easily recycled using the magnetic properties of the support. Compared to free enzyme, recycling experiments demonstrated that the operational stability of the heterogeneous biocatalyst was improved (fifteen cycles for bio-composites vs. four cycles for free enzyme).
    Applied Catalysis A General 04/2014; 437:90–95.
  • Applied Catalysis A General 04/2014; 475:469.
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    ABSTRACT: Helical mesoporous silicas containing aluminium or cerium into their framework have been synthesized via hydrothermal method. The synthesized materials were extensively characterized to understand their physico–chemical properties in view of their future catalytic applications. Low-angle powder XRD patterns of calcined samples showed a hexagonally ordered mesopore structure. NMR spectra of aluminium materials exhibited two signals at 50 and 0 ppm assigned to tetracoordinated and octahedrally coordinated Al3+. DR-UV–vis and XPS spectrum of cerium content materials show that cerium was incorporated as Ce3+ and Ce4+ into the helical mesoporous material. Materials with molar ratios Si/Al = 95 and Si/Ce = 500 were found to be catalytically active in acid (oxathioacetalisations and alkylations) or redox (epoxidation of cyclohexene) catalyzed processes, respectively.
    Applied Catalysis A General 03/2014; 435-436:1.
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    ABSTRACT: Catalytically active heterogeneous catalysts have been prepared via microwave deposition of iron oxide nanoparticles (0.5–1.2 wt%) on MCM-41 type silica materials with different morphologies (particles, helical and spheres). This methodology leads to iron oxide nanoparticles composed by a mixture of FeO and Fe2O3 species, being the Fe(II)/Fe(III) peak ratio near to 1.11 by XPS. DRUV spectroscopy indicates the presence of tetrahedral coordinated Fe3+ in the silica framework of the three catalysts as well as some extraframework iron species in the catalysts with particle and sphere-like morphologies. The loading of the nanoparticles does neither affect the mesopore arrangement nor the textural properties of the silica supports, as indicated by SAXS and nitrogen adsorption/desorption isotherms. A detailed investigation of the morphology of the supports in various microwave-assisted catalyzed processes shows that helical mesostructures provide optimum catalytic activities and improved reusabilities in the microwave-assisted redox (selective oxidation of benzyl alcohol) catalyzed process probably due to a combination of lower particle size and higher acidity in comparison with the supports with particle and sphere morphology.
    Applied Catalysis A General 03/2014; 453:383.

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