Showing papers in "Journal of Catalysis in 2003"

TL;DR: In this paper, the preparation of highly reactive titanium oxide photocatalysts and the clarification of the active sites as well as the detection of the reaction intermediates at the molecular level are discussed.

TL;DR: In this article, the potentiality of nanocrystalline, delaminated, or ultralarge pore catalysts and of zeolites formed by channels with different dimensions is outlined.

TL;DR: Ni2P/SiO2 catalysts with varying Ni/P ratios have been shown to have better performance in hydroprocessing than a commercial Ni-Mo-S/Al2O3 (HDS 98% vs 78% and HDN 80% vs 43%), based on equal sites loaded in the reactor.

TL;DR: The general trend has been one of increasingly complex catalyst formulations in response to increasingly stringent emission standards as discussed by the authors, but with greater emphasis on optimizing catalyst formulations for lean-burn applications and reducing catalyst cost and complexity without sacrificing performance.

TL;DR: In this paper, a series of manganese-cerium oxide catalysts were prepared by different methods and used for low-temperature selective catalytic reduction (SCR) of NO x with ammonia in the presence of excess O 2.

TL;DR: In this article, the photocatalytic activity of titania powders with high photocatalysis was investigated by hydrolysis of titanium tetraisopropoxide in the presence of HNO3 or NH4OH under ultrasonic irradiation.

TL;DR: The influence of cobalt loading (10 −40 wt% Co), cobalt precursor, and promoters (Re, Mn) on the physico-chemical and catalytic properties of mesoporous Co/SBA-15 catalysts for the Fischer-Tropsch Synthesis (FTS) reaction (T=493 K, P=20 bar, H2/CO=2) has been investigated as discussed by the authors.

TL;DR: In this paper, a model of the active site, which consists of an ensemble of metallic Au atoms and Au cations with hydroxyl ligands, the reaction mechanism for CO oxidation, and the mechanism for deactivation during reaction as well as regeneration are discussed with respect to the available data.

TL;DR: In this paper, surface modification of rough, high-surface area, nanocrystalline titania thin-film photocatalysts was performed by gold deposition via electron beam evaporation, with an attempt to enhance the decomposition reaction rate of industrial water pollutants.

TL;DR: In this article, organosulfonic acid-functionalized mesoporous materials were synthesized in a one-step approach of co-condensing inorganic-organic reagents in the presence of different surfactant templates with in situ oxidation of the thiol groups to the sulfonic acid groups.

TL;DR: The catalytic activity of Sn-beta zeolite in the Meerwein-Pondorf-Verley (MPV) reduction of carbonyl compounds with secondary alcohols as reductants and Oppenauer oxidation of alcohols were performed with quantitative yields to the corresponding product as mentioned in this paper.

TL;DR: In particular, the extent of methanol and/or H2 combustion at differential O2 conversion is strongly dependent on the ease of copper oxidation in the catalyst and the redox properties of the catalyst appear to play a key role in determining the pathway for H2 production as discussed by the authors.

TL;DR: In this article, the rates of formation of H2 from aqueous solutions of methanol (from 1 to 10 wt%) were measured under kinetically controlled reaction conditions at temperatures of 483 and 498 K over alumina-supported platinum catalysts.

TL;DR: In this paper, the development of in situ techniques and the introduction of operando studies have had a vast impact on research and developments in heterogeneous catalysis, and it has recently been shown that atomic-resolved images may be obtained in situ for most catalyst systems.

TL;DR: In this paper, the synthesis of supported metal and metal oxide catalysts using impregnation of an aqueous solution of chelated metal ions followed by drying is reviewed, and several examples are dealt with in some detail, in particular supported iron, nickel and cobalt-molybdenum catalysts.

TL;DR: In this paper, the kinetics of CO oxidation in excess hydrogen over a nanostructured Cu 0.1 Ce 0.9 O 2− y catalyst prepared by a sol-gel method was studied under simulated preferential oxidation (PROX) reactor conditions.

TL;DR: In this article, the initial catalytic activity and the yields of hydrogen and carbon nanofibers until complete deactivation of the catalysts depended strongly on the loading amount of Ni.

TL;DR: In this article, recent developments in catalysis by solid bases are described, especially regarding catalytic materials and catalytic reactions, such as isomerization, aldol condensation, Knoevenagel condensation and Michael condensation.

TL;DR: In this paper, self-consistent periodic DFT calculations were used to study the relative stabilities and reactivities of surface species on clean Pt(111) slabs derived by subsequent removal of hydrogen atoms from ethanol.

TL;DR: The shape-selective catalysis in molecular sieves has been extensively studied in the literature as discussed by the authors, and the fundamental concepts underlying shape selectivity have been used very effectively in the development of new catalysts for the petroleum and petrochemical industries.

TL;DR: In this article, the operating principles of solid-oxide fuel cells (SOFCs) are reviewed, along with a description of state-of-the-art SOFC designs.

TL;DR: In this paper, a brief overview of the direct conversion of CH 4 under nonoxidative conditions is given, while the bifunctionality of Mo/HZSM-5 catalysts and the role of carbonaceous deposits formed during the reaction are reviewed.

TL;DR: In this paper, the surface species formed during adsorption of NOx on a commercial NSR catalyst (containing barium oxide, Pt, and alumina as the main components) were investigated by in situ IR spectroscopy.

TL;DR: In this article, the authors show that the chromite catalyst contributes actively to soot combustion by spillover in the temperature range 300-500°C, but negligibly to methane combustion.

TL;DR: In this paper, the synthesis and structural characterization of new nickel-containing Mg-Al layered double hydroxides (LDH) was presented, which adopt a structure in which nickel, chelated with ethylenediaminetetraacetate to a divalent anion [Ni(EDTA)]2−, is nested between brucite-like layers of LDH.

TL;DR: In this article, the photocatalytic degradation of butyl acetate in the gas phase was investigated in a fixed-bed continuous annular reactor using a titanium dioxide semiconductor, Pt/TiO2 and WO3/ TiO2 catalysts.

TL;DR: In this article, the stability and configurations of intermediates in the ammonia synthesis over a Ru(0001) surface have been investigated, both over a flat surface and over a stepped surface.

TL;DR: In this paper, the authors measured the kinetic parameters for water-gas shift reaction on Cu-based catalysts under fuel reformer conditions for fuel cell applications (7% CO, 8.5% CO2, 22% H2O, 37% H 2, and 25% Ar) at 1 atm total pressure and temperature in the range of 200°C.

TL;DR: In this article, a continuous flow gas-phase hydroformylation of propene was performed using supported ionic liquid-phase (SILP) catalysts containing immobilized Rh-complexes of the biphosphine ligand sulfoxantphos in the ionic liquids 1- n -butyl-3-methylimidazolium hexafluorophosphate and halogen-free 1-n-butyl 3methyloridazolate n -octylsulfate on silica support.

TL;DR: In this article, a carbon-nanofiber-supported ruthenium catalysts were employed to study the influence of oxygen-containing surface groups on catalytic performance in the liquid-phase hydrogenation of cinnamaldehyde.