Showing papers in "Journal of Catalysis in 2002"

TL;DR: In this paper, it was shown that for a class of catalytic reactions there is a universal, reactant independent relation between the reaction activation energy and the stability of reaction intermediates.

TL;DR: In this article, rare earth (RE=La3+, Ce3+, Er3+, Pr3+, Gd3+-doped, Nd3+, Sm3+, Nd4+, Sm5+ and Sm6+ were used as precursors for the synthesis of RE/TiO2 photocatalysts, which were characterized by XRD, IR, UV-vis diffuse reflection and transient absorption spectra.

TL;DR: Based on density functional theory calculations, kinetic measurements, microkinetic and Monte Carlo simulations, thermogravimetric analysis (TGA) experiments, extended X-ray absorption spectroscopy (EXAFS) measurements, and experimental results from the literature, this paper presented a detailed and comprehensive mechanistic picture of the steam reforming process on a Ni catalyst.

TL;DR: In this article, the reaction between ethanol and water was studied in the temperature range 573 −723 K at atmospheric pressure over supported cobalt catalysts, and the extent and nature of carbon deposition depended on the sample and on the reaction temperature.

TL;DR: Pore size effects on Fischer Tropsch reaction rates and selectivities over cobalt catalysts were studied at atmospheric pressure using periodic (SBA-15 and MCM-41) and commercial mesoporous silicas as catalytic supports as mentioned in this paper.

TL;DR: Using density functional (DFT) calculations, the authors in this article proposed realistic models of γ-alumina (110 and 100) surfaces accounting for hydroxylation/dehydylation processes induced by temperature effects, leading to an accurate assignment of the OH stretching frequencies observed by infrared (IR) spectroscopy.

TL;DR: In this article, the selective oxidation of D-glucose to D-gluconic acid was performed at both controlled (7-9.5) and free pH values in an aqueous solution in the presence of a gold on carbon catalyst using dioxygen as the oxidant under mild conditions.

TL;DR: In this paper, a model was developed based on the mechanistic steps in photocatalysis to elucidate the role of particle size on the apparent photoactivity of TiO2 for the photooxidation of organic substrates in water.

TL;DR: In this paper, the effects of promoters on reduction/carburization behavior, on Fischer-Tropsch synthesis (FTS) rates, and on the number of CO binding sites formed during reaction were examined by combining steady state and transient rate measurements, titration of active sites, and X-ray absorption spectroscopy.

TL;DR: In this article, the deactivation of a catalyst in CO over Co3O4 at ambient temperature was studied with flow reactor experiments, and in-situ spectroscopic and structural methods.

TL;DR: In this article, the surface energies of the Mo-edge and S-edge terminated surfaces of single-layer nanosize MoS2 particles are derived as a function of the chemical potential of sulfur.

TL;DR: Mossbauer spectroscopy in situ was used to study the effect of high-temperature activation on the evolution of iron introduced into a ZSM-5 zeolite matrix by various methods as discussed by the authors.

TL;DR: In this article, the influence of platinum dispersion on activity and on the activity decrease with time was also studied and it was suggested that small platinum particles more easily form oxides.

TL;DR: A series of high-activity supported nickel phosphide hydroprocessing catalysts (Ni2P/SiO2) was synthesized by means of temperature-programmed reduction (TPR), and the effect of phosphorus content on hydroprocessing performance and catalyst structure was studied as discussed by the authors.

TL;DR: The catalytic properties of Al2O3-supported vanadia with a wide range of VOx surface density (1.4-34.2 V/nm2) and structure were examined for the oxidative dehydrogenation of ethane and propane as mentioned in this paper.

TL;DR: A series of iron, cobalt, and nickel metal phosphides of chemical formula Fe2P, CoP, and Ni2P with specific surface areas of around 3 m2 g−1 were synthesized by means of temperature-programmed reduction (TPR) of the corresponding phosphates as mentioned in this paper.

TL;DR: In this paper, the NO reduction mechanism is studied using combined in situ FTIR and online mass spectrometry (OMS) to analyze reaction products, and it is concluded that both NO and NO2 are involved in the reaction with NH4+ ions to form N2.

TL;DR: In this article, a bifunctional catalyst system was proposed for the selective ring opening of naphthenes to alkylcyclopentanes and alkylnaphthenses.

TL;DR: In this article, a two-step Mars-van Krevelden model involving an exchange between the gas phase and lattice oxygen was used to explain the high selectivity of the OMS-2 catalyst for this selective oxidation reaction.

TL;DR: In this article, the reaction behavior and carbon deposition during the CO2/CH4 reforming reaction have been investigated over the γ-Al2O3-supported Co catalysts as a function of Co loading and calcination temperature.

TL;DR: The mechanistic connections among propane oxidative dehydrogenation (ODH) rates, H2 reduction rates, and the electronic transitions responsible for the absorption edge in the electronic spectra of dispersed metal oxides were explored for VOx, MoOx, W O x, and NbOx samples consisting predominately of two-dimensional oxide domains supported on Al2O3, ZrO2 and MgO as mentioned in this paper.

TL;DR: In this article, X-ray diffraction, pulsed chemisorption (CO and O2), scanning and transmission electron microscopy (SEM and TEM, respectively), and Xray photoelectron spectroscopy (XPS) were used to characterize molybdenum phosphide (MoP/SiO2) catalysts.

TL;DR: In this paper, the authors used Pd-Cu catalysts at 333 K in a flow system to remove nitrate in water by hydrogenation and found that Pd and Cu were not dissolved when supported on active carbon, even at low pH reaction conditions.

TL;DR: In situ measurements of Bronsted acid sites (by titration with 2,6-di-tert-butyl-pyridine) and reduced centers (by UV-vis spectroscopy) were carried out on WOx-ZrO2 with catalysts at 2.9-32.3 W/nm2 in order to probe how these species form and act as active sites during 2-butanol dehydration as mentioned in this paper.

TL;DR: In this article, the performance of the template-ion exchange (TIE) and direct hydrothermal (DHT) catalysts for liquid-phase epoxidation of styrene with diluted H2O2 was investigated.

TL;DR: In this paper, nonlocal density functional theory (DFT) calculations are used to examine alternative mechanisms for the hydrogenolysis of acetic acid to ethanol over Pd, and the overall surface reaction energies, at low surface coverage, are computed for a number of different possible paths by which the acid may be converted to ethanol, and binding energies of various oxygenated C 2 intermediates formed along these paths are also reported.

TL;DR: In this article, the authors developed a novel catalytic process for hydrogen and syngas production from biomass at very low temperature using an excellent catalyst (Rh/CeO 2 /SiO 2 ) in a continuous-feeding fluidized-bed reactor using cellulose as a model compound.

TL;DR: In this paper, a solid catalyst for propylene carbonate synthesis from supercritical CO 2 and propylene oxide is presented, which requires no additional organic solvents and the product is automatically separated out from the CO 2 phase.

TL;DR: In this article, the effect of chloride on the catalytic performances of highly active Au/Al 2 O 3 catalysts in the selective catalytic oxidation of CO (SCO) was probed.

TL;DR: The effect of oxidation treatments of the support on the properties of carbon-supported platinum catalysts has been analyzed in this paper, where a set of activated carbon carriers has been prepared by oxidative treatments of a commercial carbon in liquid as well as in gas phase.