Catalysis Letters
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On the physicochemical and catalytic properties of H5PV2Mo10O40 supported on silica
Catalysis Letters - Tập 25 - Trang 225-240 - 1994
Properties of H5PV2Mo10O40 (HPVMo) heteropolyacid supported on high area silica (375 m2 g−1) were investigated. At low loadings interaction with surface OH groups leads to hydrolysis of Keggin anions into “triads” of edge-sharing octahedra strongly bound to the surface. Characteristic acidity is lost and methanol is oxidized to formaldehyde. At high loading unperturbed Keggin anions are present at......
Remarkable effect of addition of In and Pb on the reduction of N2O by CO over SiO2 supported Pd catalysts
Catalysis Letters - Tập 117 - Trang 73-78 - 2007
The effect of addition of In and Pb on the reduction of N2O by CO was studied over SiO2 supported Pd catalysts, using a closed gas circulation system as well as in-situ infrared spectroscopy. Formation of intermetallic compounds such as Pd0.48In0.52, Pd3Pb and Pd3Pb2 was observed which caused a drastic enhancement of the rate of N2 formation. The infrared spectroscopic analyses revealed a weakenin......
Effect of Calcination Temperature on the Catalytic Performance of γ-Bi2MoO6 in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene
Catalysis Letters - Tập 131 - Trang 401-405 - 2009
γ-Bi2MoO6 catalysts prepared by a co-precipitation method were calcined at various temperatures (425–675 °C), and were applied to the oxidative dehydrogenation of n-butene to 1,3-butadiene in a continuous flow fixed-bed reactor. Conversion of n-butene and yield for 1,3-butadiene were high at low calcination temperature (425–475 °C), but were decreased with increasing calcination temperature (525–6......
Homogeneous Rh-Sn alkoxide coatings on silica surfaces: A novel route for preparation of bimetallic Rh-Sn catalysts
Catalysis Letters - Tập 8 - Trang 345-358 - 1991
The reaction of [{(COD)Rh}2Sn(OEt)6], where COD = 1,5-cyclooctadiene and Et = ethyl, with silanol groups on silica surfaces is shown to lead to near-monolayer coverage of the silica by the Rh-Sn organometallic compound. Heating the supported compound at 498 K yields a catalyst that is active for benzene hydrogenation at room temperature. When the catalyst is reduced in H2 at 823 K, the benzene hyd......
Rapid and Highly Selective Epoxidation of Styrene by meta-Chloroperbenzoic Acid Catalyzed by Manganese Meso-tetrakis(Pentafluorophenyl)Porphyrin in the Presence of Tetrabutylammonium Acetate and Bromide
Catalysis Letters - Tập 141 Số 1 - Trang 163-167 - 2011
Epoxidation of styrene with m-CPBA in the presence of Mn(TPFPP)Cl was improved to high yield (98–100%) and excellent selectivity (100%) by using n-Bu4NOAc or n-Bu4NBr as co-catalysts in less than 5 min. Also comparison of co-catalytic activity of n-Bu4NOAc, n-Bu4NBr and imidazole in epoxidation of cis-stilbene and styrene was carried out at similar conditions.
Rate-determining Step of Selective Catalytic Reduction of NO by Acetylene Over HZSM-5
Catalysis Letters - Tập 123 - Trang 289-293 - 2008
Nitrate species is crucial intermediate of selective catalytic reduction of NO by acetylene (C2H2-SCR) over HZSM-5. It is proposed that formation of nitrate species on the zeolite is rate-determining step of C2H2-SCR. The proposition is supported by the experimental results: (1) No nitrate species could be detected by in situ FTIR in steady C2H2-SCR over HZSM-5 at 350 °C, while the bands due to ni......
A theoretical study of the initial stages of the hydrogenation of Si(111) 7×7
Catalysis Letters - Tập 23 - Trang 1-11 - 1994
We have used the periodic extended Hückel method to examine the initial stages of the hydrogenation of Si(111) 7×7. Energies, atomic charges and reduced overlap populations are considered, and we discuss the inequivalence of the adatoms. The adatom dangling bond (DB) level positions with respect to EF are also discussed. On the basis of our results, we propose the following adsorption sequence: fi......
Fischer–Tropsch Synthesis Over CNT Supported Cobalt Catalysts: Role of Metal Nanoparticle Size on Catalyst Activity and Products Selectivity
Catalysis Letters - Tập 143 - Trang 1328-1338 - 2013
Nanoparticle size effects on catalyst activity and products selectivity of CNT supported cobalt catalysts in Fischer–Tropsch synthesis are studied. CNT supported cobalt catalysts prepared by two different methods (microemulsion and impregnation) are employed to yield higher hydrocarbons from synthesis gas. To achieve a series of catalysts with different Co particle size, water-to-surfactant molar ......
A Hybrid Reduction–Impregnation Method in Preparation of Co–Ru/γ-Al2O3 Catalyst for Fischer–Tropsch Synthesis
Catalysis Letters - Tập 147 - Trang 2967-2981 - 2017
Three cobalt catalysts (Co) promoted by ruthenium supported on γ-Al2O3 were synthesized by incipient wetness co-impregnation (I/I), successive reduction (R/R), and a novel hybrid reduction–impregnation (R/I) methods. The Co loading in all of the present catalysts was 15.0 wt% and that of Ru was 0.15 wt%. To study the influence of the preparation methods on activity and selectivity of the Fischer–T......
Acid Catalyzed Direct-Amidation–Dehydrocyclization of 2-Hydroxy-acetophenones to Benzoxazoles by a One-Pot Sustainable Synthesis
Catalysis Letters - Tập 145 - Trang 939-946 - 2015
A series of 2-methyl-benzoxazoles have been synthesized starting from 2-hydroxy-acetophenones via a one-pot three steps reaction. Hydroxylamonium salt has been used as amidation agent. The reaction occurs with different anions, but the best results is achieved with hydroxylamonium hydrchloride. Despite the number of consecutive stages, the reaction is highly selective. Mild reaction conditions and......
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