Showing papers in "Journal of Catalysis in 1995"

TL;DR: In this paper, it is shown that incorporation of ZrO2 into a solid solution with CeO2 strongly promotes bulk reduction of the Rh-loaded solid solutions in comparison to a Rh/CeO2 sample.

TL;DR: In this paper, high-resolution electron microscopy and X-ray microchemical analysis were used to characterize the composition, size, distribution, and morphology of Pt-Ru particles with nominal Pt:Ru ratios of 1:1 and 3:1, supported on carbon black.

TL;DR: In this article, it has been shown that the intrinsic activity of MCM-41 is lower than Ti-Beta and TS-1 when using H2O2 as oxidant.

TL;DR: In this article, a metal oxide composite catalyst for the total oxidation of carbon monoxide and methane was prepared by combining fluorite oxides with active transition metals and showed excellent resistance to water vapor poisoning.

TL;DR: In this article, in situ FTIR and on-line mass spectrometric studies have provided simultaneous information of the surface adsorbed species on vanadia/titania catalysts and the composition of reaction products during the selective catalytic reduction (SCR) of NO.

TL;DR: In this article, the reaction mechanism and catalytic cycle for the selective catalytic reduction of nitric oxide by ammonia over vanadia/titania catalysts has been elucidated by in situ on-line FTIR studies under steady-state conditions.

TL;DR: In this article, the influence of small amounts of Pt on supported Co catalysts has been investigated by several methods, and it was shown that Pt-promoted catalysts were 3-5 times higher than those on their unpromoted analogues.

TL;DR: In this paper, the adsorption geometries of acrolein, crotonaldehyde, methylcrotonaldehyde (prenal), and cinnamaldehyde on Pt and Pd surfaces have been studied by means of semi-empirical extended Hckel calculations.

TL;DR: In this paper, the reaction kinetics of CO and methane oxidation over the Cu-Ce-O catalysts were measured at a partial pressure of CO or oxygen from 0.001 to 0.06 bar, and at temperatures ranging from 40 to 200°C for CO oxidation and from 400 to 550°c for methane oxidation.

TL;DR: In this paper, the catalytic activity in the reduction of NO by ammonia in the presence of oxygen (SCR process) is reported for CuO-TiO2 and for different catalysts belonging to the MgO-Fe2O3 system.

TL;DR: The MCM-41-based catalyst was seen to give superior HDS, HDN, and HC activities to the latter two catalysts in a one-stage operation using an untreated gasoil.

TL;DR: In this article, the influence of preparation parameters (the hydrolysis route, Ti-content, drying method, and calcination temperature) on the structural and chemical properties of the aero- and xerogels was studied by means of N2-physisorption, X-ray diffraction, thermal analysis, and vibrational spectroscopy (FTIR, FTRaman).

TL;DR: In this paper, a synergism between V and W oxide surface species is suggested, which accounts for the high reactivity of the ternary samples in the SCR reaction.

TL;DR: In this paper, the effect of activation and reaction treatments on the resulting phase transformations in a commercial, precipitated, and spray-dried Fe2O3-CuO-K2O Fischer-Tropsch catalyst has been studied.

TL;DR: In this article, an optimized hydrotalcite showed excellent catalytic properties for the synthesis of 2′,4,4′-trimethoxychalcone (Vesidryl), a product of pharmacological interest.

TL;DR: In this paper, the authors used a model reacting mixture containing compounds representative of the molecules that must react to permit a primary stabilisation of the pyrolytic oil: 4-methylacetophenone (4-MA), diethylsebacate (DES), and guaiacol (GUA).

TL;DR: The catalytic performance of zeolite β in the liquid-phase alkylation of benzene is compared with that of other solid catalysts as discussed by the authors, and a hypothesis to explain this behavior is given.

TL;DR: In this paper, an FTIR analysis of adsorbed CO and acetonitrile reveals the presence of Lewis and Bronsted sites in both catalysts, and the results indicate that the remarkable activity of SZ and FMSZ is not caused by exceptionally strong acid sites, but by stabilization of the transition state complex at the surface.

TL;DR: In this paper, a kinetic model for the monomolecular conversion of light n-alkanes (propane to n-hexane) over H-ZSM-5 was investigated between 723 and 823 K.

TL;DR: The role of water on the acidic and catalytic properties for n-butane isomerization reaction is emphasized in this article, where at least four sulfated species were identified and exhibited an important and reversible sensitivity to water by the study of adsorption of incremental amounts of water.

TL;DR: In this article, a comparison of different titania-silica catalysts for cyclohexene, cyclodecene, norbornene and limonene epoxidation was performed using FTIR and UV-vis spectroscopy.

TL;DR: A kinetic model of methanol synthesis is presented in this paper, where all parameters in the model are estimated from gas-phase thermodynamics and surface science studies, and the rate-limiting step in the kinetic model was determined from Cu(100) single-crystal experiments.

TL;DR: In this article, double-layered hydroxides with hydrotalcite structure were synthesized with Mg/Al atomic ratios of 2.5 and 3 and with different contents of exchangeable Cl− and CO2−3anions.

TL;DR: In this article, the surface and bulk compositions of these catalysts were studied by X-ray photoelectron spectroscopy (XPS), XRD, and CO chemisorption, showing that the fluorite structure of CeO 2 was maintained in all catalysts.

TL;DR: In this article, it was shown that bismuth atoms are selectively and homogeneously deposited on the palladium particles by a surface redox reaction on Pd/C catalysts containing 1-to 2-nm Pd particles.

TL;DR: In this article, the effect of substitution of α,β-unsaturated aldehydes on the activity and selectivity of a series of platinum catalysts was investigated for the hydrogenation of these compounds.

TL;DR: In this article, the skeleton of tetrehedra-based silica polymorphs was analyzed based on a general interpretation of the vibrational structure of tetrahedra based silica, which led to a partial modification of the traditional assignments of the skeletal vibrations of zeolites.

TL;DR: In this paper, a commercial promoted precipitated iron catalyst (100 Fe/5 Cu/4.2 K/25 SiO2 by weight) was characterized after different pretreatment conditions and after Fischer-Tropsch (FT) synthesis in a fixed bed reactor.

TL;DR: In this paper, the structure of Mo/HZSM-5 catalysts with various molybdenum loadings were studied by means of XRD, IR, UV diffuse reflectance spectroscopy, TPR, and ammonia adsorption and desorption measurements.