Showing papers in "Journal of Catalysis in 1999"

TL;DR: In this article, the effects of support on the structure and catalytic behavior of supported vanadia in the oxidative dehydrogenation of propane were examined over a wide range of vanadium surface densities (0.5-15.0 VO x /nm 2 ).

TL;DR: An FTIR and quadrupole mass spectroscopic study of the water-gas shift (WGS), the reverse WGS reactions, and the adsorption of the individual molecules involved has been carried out on Au/Fe2O3 and Au/TiO2 catalysts as mentioned in this paper.

TL;DR: In this article, the authors showed that the W centers are in a distorted octahedral oxygen environment, even after dehydration at 673 K, in all WOx-ZrO2samples (2-21 wt.% W) oxidized at 1073 K.

TL;DR: In this article, the size of the gold particles in solution by UV-vis spectrophotometry in combination with HRTEM indicated that the gold colloids are rather stable in alkaline solution, during pH-change and purification with dialysis.

TL;DR: In this paper, carbon formation behavior under CH4-CO2 reaction and through CH4decomposition and CO disproportionation was investigated over Ni0.03Mg0.97O solid solution, supported Ni/MgO, and NiO-Al2O3catalysts by means of thermogravimetric analysis and transmission electron microscopy (TEM).

TL;DR: In this article, the state of Fe dispersion in Fe-H-ZSM-5 was investigated by means of infrared spectroscopy of adsorbed NO, temperature-programmed desorption (TPD) of NO, TPD of NH3, and H2 temperatureprogrammed reduction (TPR).

TL;DR: In this paper, a model consisting of single-layer MoS2 chains with and without promoter atoms located at the edges is used to represent the structures in the catalysts, and full relaxation is allowed to find the lowest energy configurations.

TL;DR: In this article, supported gold catalysts were prepared by a deposition-precipitation method and characterized to understand the different activities for CO oxidation with different pretreatment conditions, with the Al{sub 2}O{sub 3]-supported catalyst showing activity substantially lower than that of the other two catalysts.

TL;DR: In this paper, the selective catalytic reduction of NO with C3H6 in the presence of a large excess of O2 was studied over γ-Al2O3 and the lowloading silver material exhibited high conversions to N2 whereas the highloading sample predominantly yielded N2O.

TL;DR: In this paper, the effect of key parameters on the characteristics of barium oxide-based NOxstorage catalysts was systematically investigated, and the influence of temperature, storage and regeneration times, NOxsource (NO or NO2), oxygen concentration, reducing agent (C3H6, C3H8, CO, or H2), and carbon dioxide concentration on NOx storage capacity was studied.

TL;DR: In this paper, the V2O5-MoO3/TiO2 catalysts are considered and the presence of electronic interactions between the TiO2-supported V and Mo oxides is also apparent.

TL;DR: The mesoporous sulfonic catalysts are also employed in the esterification of propanediols andmeso-erythritol, and for reactions with other fatty acids as mentioned in this paper.

TL;DR: In this article, gold catalysts for low-temperature CO oxidation were prepared by immobilizing gold colloids of about 2 nm size on TiO2 and ZrO2 in aqueous solution.

TL;DR: In this article, the reaction of ethanol on unreduced and H2-reduced CeO2 and 1 wt% Pd/CeO2 has been investigated by steady state reactions, temperature programmed desorption (TPD), and in situ Fourier transform infrared (FT-IR) spectroscopy.

TL;DR: In this article, isotopic tracer results are consistent with a Mars-van Krevelen redox mechanism involving two lattice oxygens in irreversible C-H bond activation steps.

TL;DR: In this article, the selective CO oxidation on a Au/α-Fe2O3 catalyst in simulated reformer gas (low concentrations of CO and O2, 75 kPa H2, balance N2) at atmospheric pressure was investigated over almost two orders of magnitude in CO partial pressure (0.025-1.5 kPa) and over a large range of pO2/pCOratios ( 0.25-10).

TL;DR: In this paper, the photoactivity of pure rutile is found to increase with increasing Sn in the solid solution of rutiles, and it peaks at a tin content of 0.075.

TL;DR: In this paper, the direct conversion of methane to aromatics such as benzene and naphthalene has been studied on a series of Mo-supported catalysts using HZSM-5, FSM-16, mordenite, USY, SiO2, and Al2O3 as supporting materials.

TL;DR: In this paper, the active oxygen species and mechanism for catalytic CO oxidation with O2 on a highly active TiO2-supported Au catalyst (denoted as Au/Ti(OH)*4), which was prepared by supporting a Au-phophine complex on as-precipitated wet titanium hydroxide followed by calcination at 673 K, have been studied by means of oxygen isotope exchange, O2 temperature-programmed desorption (O2 TPD), electron spin resonance (ESR), and Fourier-transformed infrared spectrosc

TL;DR: In this article, the authors used unidirectional 12-membered ring (MR) zeolites with different pore diameters and other pore topologies, including one with connected 12×10 MR pores and two tridirectal 12 MR zeolite.

TL;DR: The delamination of the layered precursor of the MCM-22 zeolite (MWW structure) affords monolayers of a crystalline aluminosilicate with more than 700 m 2 g −1 of a well defined external surface formed by cups of 0.7×0.7 nm.

TL;DR: In this article, the authors investigated the effect of the interaction of a calcined Cu/CeO{sub 2} catalyst with CO and reoxidation with O(sub 2 ) using CO-TPR, EPR, FTIR of adsorbed CO and XPS.

TL;DR: The selective catalytic reduction (SCR) of NO (2000 ppm) by NH3(2000 ppm), in the presence of oxygen (3%) was carried out on Cu(x)-FAU (x=theoretical exchange degree) catalysts prepared by ion exchange or impregnation and calcined at 773 K as discussed by the authors.

TL;DR: In this article, the complete photocatalytic oxidation of C2H4 with O2 into CO2 and H2O has been achieved on ultrafine powdered TiO2 photocatalyst and the addition of H 2O was found to enhance the reaction.

TL;DR: In this paper, a new model for the metal-support interaction explicitly excludes the need for electron transfer, and it can account for all observed changes in the catalytic, electronic, and structural properties of the supported metal particles induced by support acidity ranging from acidic to neutral to alkaline.

TL;DR: In this article, the low-temperature CO oxidation activity of three monolith catalysts (Pt/Al2O3, CoOx/Al 2O3 and Pt/Coox/Al 3) has been studied.

TL;DR: In this article, a theoretical study of methane dissociation and syngas formation on a number of transition metals M (M=Ru, Os, Rh, Ir, Pd, Pt, Cu, Ag, Au) is presented.

TL;DR: In this paper, the rearrangement of cyclohexanone oxime to e-caprolactam was investigated over heterogeneous catalysts, especially over highly siliceous zeolites with a MFI structure.

TL;DR: In this article, two types of precursor, (Pt(NH3)4(NO3)2 and H2PtCl6, referred to as A and B catalysts, respectively, were used for catalyst preparation.