Reaction Kinetics and Catalysis Letters (REACT KINET CATAL L)

Publications in this journal

• Article: Photocatalytic efficiency of nanocrystalline zeolite TS-1 for the degradation of methyl orange

  Hsiu-Ling Hsu, Rosilda Selvin, L. Selva Roselin, Prajitha Kumari, Jia-Wei Cao
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  ABSTRACT: The photocatalytic properties of nanocrystalline TS-1 were confirmed via the degradation of an aqueous solution of the model compound methyl orange (MO). The light intensity and quantum yield were measured by ferrioxalate actinometry and the values are 1.7×10−5 einstein l−1s−1 and 0.71, respectively. The experimental parameters such as catalyst loading, pH and initial concentration of MO were optimized at 1.5g/L, 10 and 300μM, in order. The results showed that the dye molecules are completely degraded to CO2, H2O and simple inorganic ions.
  Reaction Kinetics and Catalysis Letters 05/2012; 98(2):265-272.
• Article: Synthesis of novel dioxomolybdenum(VI) complexes bearing ferrocenyldiimine and their catalytic performances in olefin epoxidation

  Feng-Lan Chai, Xiang-Yu Wang, Xiao-Rong Zhang, Jing-Chao Tao
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  ABSTRACT: Novel dioxomolybdenum(VI) complexes bearing bis(ferrocenylcarbaldimine) ligands were prepared in good yield and characterized by spectroscopy and elemental analysis. The complexes were found to be excellent catalysts for the homogeneous epoxidation of cyclohexene and styrene using tert-butyl hydroperoxide (TBHP) as oxidant. The complexes can be recovered and reused.
  Reaction Kinetics and Catalysis Letters 05/2012; 97(2):341-348.
• Article: Catalytic activity of Pd/CN systems in hydrogenation of styrene

  Magdalena Hofman, Leszek Wachowski
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  ABSTRACT: Hydrogenation of styrene was applied as a test reaction to study the catalytic activity of Pd deposited on the surface of carbonaceous materials enriched with nitrogen (CN). The nitrogen content in the support material was found to have a great influence on the degree of styrene conversion to ethylbenzene. In addition, the reaction was carried out in the presence of modified carbonaceous materials acting as catalysts.
  Reaction Kinetics and Catalysis Letters 05/2012; 92(2):355-360.
• Article: In situ FTIR study of transformation of 3-cyanopyridine on V–Ti–O catalyst

  Yuriy A. Chesalov, Galina Ya. Popova, Galina B. Chernobay, Tamara V. Andrushkevich
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  ABSTRACT: Surface complexes of cyanopyridine on a V–Ti–O catalyst were studied by in situ FTIR spectroscopy. In the temperature range of 130–290°C, two types of adsorbed cyanopyridine bound to different sites (Lewis acid sites or Brönsted acid sites) were found to transform into surface nicotinamide. At 220–290°C, surface heterocyclic complexes decompose to form carboxylates and ammonium ions.
  Reaction Kinetics and Catalysis Letters 05/2012; 98(1):43-50.
• Article: Mimicking a Superoxide Dismutase (SOD) Enzyme by copper(II) and zinc(II)-complexes

  Imre Labádi, Mária Benkő, Kata Markó, István Szilágyi
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  ABSTRACT: Mimicking the Superoxide Dismutase Enzyme (SOD), several imidazolato-bridged copper(II)-zinc(II) complexes were prepared, characterised by IR spectroscopy and their SOD enzyme activity was determined. 2,2′-Bipyridine, 2,2′:6′,2″-terpyridine and tris(2-aminoethyl)amine molecules were used on both metal sides, as coordinating ligands. The complex, containing the 2,2′:6′,2″-terpyridine ligand on copper side has the smallest SOD activity, which indicates the importance of the rigidity of the copper complex in SOD activity.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(2):327-333.
• Article: Partial oxidation of methane into synthesis gas over a Pt-supported complex fluorite-like oxide: one-channel studies in realistic feeds

  Natalya N. Sazonova, Vladislav A. Sadykov, Aleksey S. Bobin, Svetlana A. Pokrovskaya, Elena L. Gubanova, Claude Mirodatos
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  ABSTRACT: Partial oxidation of methane (POM) into synthesis gas over a single channel of monolithic catalyst 1.4 wt% Pt/Gd0.3Ce0.35Zr0.35Ox/α-Al2O3 was investigated. The effect of the catalyst pretreatment and of the process parameters (temperature, contact time, feed composition) on the catalytic activity and synthesis gas (syngas) selectivity was studied at conditions close to realistic ones with a minimum impact of the mass and heat transfer phenomena. Experimental data are in favor of the direct route of the syngas formation via the methane pyrolysis—selective oxidation sequence.
  Reaction Kinetics and Catalysis Letters 05/2012; 98(1):19-26.
• Article: Photooxidation of ethanol on Cu-layer silicate/TiO2 composite thin films

  Judit Ménesi, Renáta Kékesi, Volker Zöllmer, Torben Seemann, André Richardt, Imre Dékány
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  ABSTRACT: Thin film composites of copper-montmorillonite and TiO2 were prepared and their optical and catalytic properties for ethanol photooxidation were evaluated. The efficiency of composite Cu-clay/TiO2 = 20/80 was two-fold higher than the standard TiO2(P25) photocatalyst.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(2):367-377.
• Article: Catalytic activity of H3PMo12−XWXO40 and H6P2MO18−XWXO62 heteropolyacid (HPA) catalysis in the direct preparation of dichloropropanol (DCP) from glycerol

  Sang Hee Lee, Dong Ryul Park, Heesoo Kim, Joohyung Lee, Ji Chul Jung, Sunyoung Park, Kyung Min Cho, In Kyu Song
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  ABSTRACT: H3PMo12−XWXO40 (X=0−12) and H6P2Mo18−XWXO62 (X=0−18) heteropolyacid catalysts were applied to the direct preparation of dichloropropanol from glycerol. Acid properties of the catalysts were determined by NH3-TPD measurements. The catalytic performance increased with increasing acid strength of the catalyst. Among the catalysts tested, the H3PW12O40 catalyst of highest acid strength showed the best catalytic performance.
  Reaction Kinetics and Catalysis Letters 05/2012; 94(1):71-76.
• Article: Effect of nickel loading on the activity of Ni/ZrO2 for methane steam reforming at low temperature

  Long Q. Nguyen, Leonila C. Abella, Susan M. Gallardo, Hirofumi Hinode
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  ABSTRACT: The effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated. The sample containing 15 wt.% Ni exhibited the highest activity as well as stability at 600°C.
  Reaction Kinetics and Catalysis Letters 05/2012; 93(2):227-232.
• Article: An experimental study on the kinetics of leaching for the preparation of a Raney-silver catalyst

  Inci Salt, Selahattin Gültekin
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  ABSTRACT: A Raney-Ag catalyst was prepared by leaching out aluminium from a Raney Ag-Al alloy with NaOH solution. The kinetics of leaching has been investigated in a stirred-batch-reactor at various temperatures by using alloy particles of different sizes. The kinetic model best fitting the experimental results has been determined.
  Reaction Kinetics and Catalysis Letters 05/2012; 83(2):253-260.
• Article: Peculiarities of dehydroaromatization of CH4–C2H6 and CH4 over Mo/ZSM-5 catalysts

  Ekaterina V. Matus, Olga B. Sukhova, Ilyas Z. Ismagilov, Lidiya T. Tsikoza, Zinfer R. Ismagilov
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  ABSTRACT: The peculiarities of dehydroaromatization (DHA) of a CH4–C2H6 mixture over 1–10% Mo/ZSM-5 catalysts (Si/Al=17, 30, 45) were studied in comparison with reactions of individual hydrocarbons. For a (90vol.% CH4+10vol.% Ar) mixture, the methane conversion passes through a maximum and decreases with the time-on-stream, being about 12% after 6h. Experiments with a mixture (85vol.% CH4+5vol.% C2H6+10vol.% Ar) demonstrated that the presence of ethane leads to the suppression of the methane conversion practically to zero and to an increase in the benzene formation rate in comparison with the (CH4+Ar) mixture. Characterization of the spent Mo/ZSM-5 catalysts by DTA and TGA showed that both the condensation degree of the carbonaceous deposits (C/H ratio) and their content are higher in the presence of ethane. For both feed compositions, the maximal benzene formation rate was observed over the catalyst with 2wt% Mo and Si/Al=17. It is proposed that the formation of C2 intermediates from methane and their further transformations in DHA compete with the ethane aromatization, presumably on the same Mo active sites.
  Reaction Kinetics and Catalysis Letters 05/2012; 98(1):59-67.
• Article: Leaving group effect in the sulfonyl transfer reactions of aryl benzenesulfonates with Grignard reagents

  Fatma Eroğlu, Didem Kâhya, Ender Erdik
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  ABSTRACT: The C–S coupling reactions of aryl benzenesulfonates with phenylmagnesium bromide in THF:toluene (7:10) at 90°C have been studied. A Hammett-type kinetic study of the leaving group effect of aryloxy groups provides a conclusive support for a two step addition-elimination mechanism in which C–S bond formation is rate determining step.
  Reaction Kinetics and Catalysis Letters 05/2012; 98(2):365-373.
• Article: Structure–reactivity relationship in transfer hydrogenation of aliphatic ketones over magnesium oxide

  Marek Gliński
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  ABSTRACT: The vapour phase reduction of various aliphatic ketones to the corresponding carbinols by propan-2-ol in the presence of MgO as a catalyst has been studied. A strong decrease of the reactivity (from 86 to 0%) in the reduction of pentan-3-one and its polymethyl derivatives with an increase of the bulkiness of both alkyl groups in the ketone has been observed. For ketones with the general formula CH3-(CH2)n-CO-(CH2)8–n-CH3, where n=0, 1, 2, 3 and 4, a shift of the carbonyl group to the middle of a molecule causes only a small decrease of the reactivity. It has been stated that the observed changes in the reactivity of ketones are mainly caused by a steric hindrance around their carbonyl groups.
  Reaction Kinetics and Catalysis Letters 05/2012; 97(2):275-279.
• Article: Deep oxidative desulfurization of fuels catalyzed by pristine simple tungstic acid

  Huaming Li, Wenshuai Zhu, Jidong Lu, Xue Jiang, Lisong Gong, Guopeng Zhu, Yongsheng Yan
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  ABSTRACT: The catalytic system of pristine simple tungstic acid and quaternary ammonium salts has been found suitable for deep removal of sulfur in diesel with H2O2 as oxidant. The longer the length of the carbon chain of the quaternary ammonium salt is, the better its catalytic activity is in desulfurization. By combining oxidation and extraction with dimethylformamide, low sulfur level in diesel could be obtained.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(1):165-173.
• Article: Anion radical formation in the reaction of chloranilic acid with n-methylpiperidine in acetonitrile

  Miroslaw Dworniczak
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  ABSTRACT: Reaction of chloranilic acid with N-methylpiperidine in acetonitrile has been studied. The product of the reaction is an unusually stable anion radical of quinone. The presence of radicals has been confirmed by EPR measurements. Stability constant, extinction coefficients and thermodynamic reaction parameters are reported. Mechanism of the reaction is proposed.
  Reaction Kinetics and Catalysis Letters 05/2012; 78(1):65-72.
• Article: Alkylation of aromatic compounds with multi-component Lewis acid catalysts of ZnCl2 and ionic liquids with different organic cations

  Rajendra Srivastava, Shin-Ichiro Fujita, Shuhei Okamura, Masahiko Arai
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  ABSTRACT: Alkylation of aromatic compounds with various alkylating agents such as benzyl chloride, benzyl alcohol and isopropyl chloride were investigated using ZnCl2 based ionic liquid (ILs) Lewis acid catalysts. Multi-component Lewis acid catalysts of ZnCl2 and ionic liquids such as 1-butyl-3-methylimidazolium bromide, 1-butylpyridinium bromide, cholin chloride and tetrabutylammonium bromide were prepared, supported on silica gel, and compared for alkylation reactions with various alkylating agents. Among the IL-based catalysts, 1-butyl-3-methyl imidazolium-bromide-ZnCl2 and 1-butylpyridinium bromide-ZnCl2 are highly active.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(1):55-64.
• Article: Kinetics of the reaction of OH radicals with CH3OH and CD3OD studied by laser photolysis coupled to high repetition rate laser induced fluorescence

  Alexander Parker, Chaithanya Jain, Coralie Schoemaecker, Christa Fittschen
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  ABSTRACT: A new experimental set-up coupling laser photolysis to a 10 kHz dye laser as the excitation source for OH fluorescence has been validated by measuring the rate constant of the reaction CH3OH + OH. The rate constant of the deuterated homologue CD3OD + OH has been measured under the same conditions.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(2):291-297.
• Article: Enantioselective hydrogenation of (E)-2-methyl-2-butenoic acid over cinchonidine modified Pd catalyst. Effect of the structure of achiral amine additives

  György Szőllősi, Zsolt Makra, Mihály Bartók
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  ABSTRACT: The effect of the structure of the achiral primary amine additive on the enantioselective heterogeneous catalytic hydrogenation of (E)-2-methyl-2-butenoic acid over cinchonidine modified Pd/Al2O3 was studied. It was found that a variety of amines increase the enantioselectivity, which was always accompanied by decrease in the initial rate of the hydrogenations. Based on these results, the participation of the amine additive in the formation of the intermediate complex responsible for enantioselection was suggested. A decrease in the reaction temperature resulted in further increase in the optical purity of the product up to 67%, the highest value reported in the hydrogenation of unsaturated aliphatic acids in this heterogeneous catalytic system so far.
  Reaction Kinetics and Catalysis Letters 05/2012; 96(2):319-325.