Showing papers in "Journal of Catalysis in 2001"

TL;DR: In this article, a thorough comparison of gold catalysts on different support materials as well as activity measurements for Au on mixed oxides (Au/Fe2O3·MgO) reveal enhanced CO oxidation rates for a group of active support materials (Fe 2O3, TiO2, NiOx, CoOx).

TL;DR: In this paper, the authors showed that the anatase and rutile particles separately form their agglomerates and the average sizes of anatase particles are 85 and 25 nm, respectively.

TL;DR: Using density functional calculations, the authors showed that there is an essentially linear relationship between the activation energy for N2 dissociation and the binding energy of atomic nitrogen on a range of transition metal surfaces.

TL;DR: In this paper, three Au/TiO 2 catalysts, with the same Au loading and with different particle sizes, were prepared by the deposition-precipitation method followed by calcination at three different temperatures, 473, 573, and 873 K. The mean diameters of Au particles were 2.4, 2.5, and 10.6 nm, respectively.

TL;DR: In this paper, a detailed degradation pathway has been determined by careful identification of intermediate products, in particular, carboxylic acids, whose decarboxylation by photo-Kolbe reactions constitutes the main source of CO2 evolution.

TL;DR: In this article, the effect of moisture in the reactant gas on CO oxidation over Au/TiO2 has been quantitatively investigated over a wide range of concentrations from 0.1 to 6,000 ppm.

TL;DR: In this article, transmission electron microscopy (TEM), dynamic oxygen chemisorption (DOC), and EXAFS were used to characterize supported MoS2 catalysts.

TL;DR: In this article, a transient study on the NOx storage-reduction properties of a PtBaO/γ-Al2O3 catalyst is performed by using a synthetic exhaust gas containing oxygen and nitrogen oxides (storage phase) and a reducing gas containing hydrogen (reduction phase).

TL;DR: In this article, the impact of water vapor on the formation of Co-support compounds and the resulting characteristics of Co/γ-Al 2 O 3 and Co-Ru/γ -Al 2O 3 catalysts were investigated to develop a better understanding of the nature of the cobalt compounds formed and the effect of noble metal promotion on their formation.

TL;DR: In this paper, the selective oxidation of CO on Au/Al 2 O 3 and Au/MO x /Al O 3 (M=Mg, Mn) in the presence of H 2 was studied and the effect of water was also found to have a pronounced effect on the CO oxidation rate even at room temperature.

TL;DR: In this article, the effect of alloying Pt with other metals for use as anode catalyst materials in low-temperature fuel cells is discussed, and an extensive data base of the effect on the reactivity that includes all binary combinations of the transition metals to the right in the periodic table is given.

TL;DR: In this paper, thermal and hydrothermal treatments have been applied to an amorphous TiO2 precursor for obtaining nanosized TiO 2 particles (P11t and P11h, respectively) of different photocatalytic properties.

TL;DR: In this paper, the photocatalytic degradation of three model pollutants (phenol, 4-chlorophenol, and herbicide 2,4-D) was performed at room temperature in aqueous suspended mixtures of TiO2 and of two different activated carbons (AC) of commercial origin.

TL;DR: In this article, the authors obtained the first atomic-scale images of the Co-Mo-S structure present in HDS catalysts by means of scanning tunneling microscopy (STM).

TL;DR: In this paper, high-purity carbon was demonstrated to form at temperatures not lower than 680°C in the presence of both bare α-Fe and catalysts based thereon with admixtures of various hard-to-reduce oxides (SiO2, Al2O3, ZrO2 and TiO2).

TL;DR: In this article, the influence of the addition of very small amounts of Ru, Pt, and Pd to supported cobalt catalysts, which were prepared by mixing cobalt nitrate and cobalt acetate, has been investigated for the Fischer-Tropsch synthesis.

TL;DR: In this paper, a new application of Ti-containing molecular sieves as catalysts for the oxidation of aromatic sulfur compounds with hydrogen peroxide under mild conditions was discussed. But the results showed that the sulfoxidation reaction can be used for decreasing the sulfur content of kerosene without consumption of hydrogen and use of high pressure equipment.

TL;DR: In this paper, the effects of MoOx structure on propane oxidative dehydrogenation (ODH) rates and selectivity were examined on Al2O3-supported molybdenum oxide catalysts with a wide range of Mo surface density (0.4-12 Mo/nm2).

TL;DR: In this article, the cycloaddition of carbon dioxide to various epoxides (ethylene oxide, epoxybutene, and epoxypropylbenzene) over solid base cata-lysts was performed in a batch autoclave reactor at 423 K and with excess CO2.

TL;DR: In this article, the authors argue that, while analysis with DeDonder relations is a powerful approach that has many advantages, it has a limitation with respect to finding the rate determining step, and another method, previously proposed by this author (C. T. Campbell, Topics Catal. 185, 496 (1999)), involving the degree of rate control, is preferable in that particular respect.

TL;DR: In this paper, the catalytic properties of Ti-MWW catalysts have been studied for the oxidation of alkenes using hydrogen peroxide or tert -butyl hydroperoxide (TBHP) as an oxidant.

TL;DR: In this article, the authors used a very low heating rate of 0.2°C/min to obtain particles with an EXAFS Pt-Pt coordination number of 5-6, i.e., particles of 13-20 atoms.

TL;DR: In this paper, the authors compared the activity and selectivity of copper and platinum monometallic catalysts compared to those of their bimetallic counterparts and found that copper has a negative influence on the selectivity toward nitrogen.

TL;DR: In this article, the bulk structure of copper in various binary Cu/ZnO catalysts for steam reforming of methanol under activation and working conditions is studied by in situ X-ray diffraction (XRD) and Xray absorption spectroscopy (XAS).

TL;DR: In this paper, Catalytic properties of substituted lanthanum chromites were investigated for their use as anode materials for direct methane oxidation in solid oxide fuel cell (SOFC) anode material.

TL;DR: In this paper, the properties of the NOx species obtained on NO adsorption and its coadsorption with O2 at room temperature on TiO2 and MnOx/TiO2 catalysts with two different manganese loadings have been studied by means of in situ Fourier transform infrared spectroscopy.

TL;DR: In this article, the dependence of the type of carbon formed and the amount of CO evolved on the nature of the support was highlighted, and the CO formation rates showed a common trend for all the catalysts: high initial rates followed by lower stabilized rates.

TL;DR: In situ FT-IR spectroscopy was used to study the surface species involved in the selective epoxidation of propene with an O2/H2 mixture over a deactivating 1 wt% Au/TiO2/SiO2 catalyst and a non-deactivating 2 wt%.

TL;DR: In this article, the performance of cobalt and cobalt-phosphorus catalysts in the presence of octahedral Co 2+ ions was investigated in the context of ethane ODH.

TL;DR: In this paper, the mesoporous structure of vanadia supported on MCM-41 catalysts has been investigated and it was shown that vanadium is mainly in a tetrahedral environment.