Showing papers in "Catalysis Today in 2008"

TL;DR: In this article, it was shown that the interaction of adsorbed CO and O is mainly responsible for CO 2 formation on Mn 2 O 3 and MnO 2 catalysts, following either the Langmuir-Hinshelwood mechanism or Eley-Rideal mechanism.

TL;DR: In this article, the authors highlight some recent experimental and theoretical studies of both unpromoted MoS 2 and promoted CoMoS and NiMoS nanostructures, and show that the Ni-MoS structures may in some instances differ from the CoMo-S analogues.

TL;DR: The reactivity of a commercial Fe-exchanged zeolite catalyst is analyzed in the NH 3 -SCR reactions of interest for industrial applications to the aftertreatment of diesel exhausts as discussed by the authors.

TL;DR: In this article, a heterogeneous catalyst system was developed for the production of biodiesel from used VOs using a continuous process, where free fatty acids (FFA) contained in the used VO, which cause several severe problems in transesterification catalysis, were converted to fatty acid methyl esters (FAME) before the main biodiesel production process.

TL;DR: In this paper, the authors described the acetylation of glycerol with acetic acid catalyzed by different solid acids, which was carried out in batch mode under reflux.

TL;DR: The results showed that Mnx+ cations entered into the ceria lattice to form solid solutions, which increased the amount of oxygen vacancies and promoted surface oxygen chemisorption as mentioned in this paper.

TL;DR: In this article, a microwave-solvothermal process was used to synthesize a nanocrystalline Bi 2 WO 6 photocatalyst with nanosheet morphology, which was successfully synthesized by using X-ray diffraction technique (XRD), BET surface area analysis, Uvvis diffuse reflectance spectrum (Uv-vis DRS), field emission scanning electron microscopy (SEM), transmission electron microscope (TEM), and Xray photoelectron spectroscopy (XPS).

TL;DR: In this paper, the catalytic activity and selectivity of several compounds of the alkaline and alkaline-earth metals in the transesterification with methanol at 323 K of refined sunflower oil have been evaluated.

TL;DR: In this article, the photocatalytic activity of the titanate nanotubes was evaluated using the photooxidation of a dye, amaranth, as probe reaction.

TL;DR: In this article, the authors combine X-ray Photoelectron Spectroscopy (XPS), catalytic tests, and density functional theory (DFT) modeling for determining the optimized Co edge decoration according to the stability and reactivity of the CoMoS active phase.

TL;DR: In this article, a comparative study of unsupported MoS 2 and Me/MoS 2 (Me = Co, Ni) catalysts prepared by hydrothermal synthesis in a laboratory was conducted.

TL;DR: The phase diagrams and equilibrium 2D-morphologies of Co(Ni)MoS nano-crystallites with various promoter contents are determined by periodic DFT calculations coupled to a thermodynamic model as discussed by the authors.

TL;DR: In this article, a detailed microkinetic model for methane oxidative coupling has been developed including so-called catalyst descriptors, which can capture the trends in productivity and selectivity on different catalysts.

TL;DR: In this article, the effect of the Ni2+ and Ce3+ incorporation methods in the hydrotalcite-type structure was studied, and the results demonstrate the formation of solids with mixed crystalline phases of NiO−MgO (periclase) type and CeO2 (fluorite) as well as other types of reducible species.

TL;DR: In this paper, the authors summarized studies carried out recently by French scientists in three directions, the improvement of the preparation and activation methods of molybdenum or tungsten sulfide based catalysts, the search for new active phases based on solid state chemistry concept or bifunctional mechanism, and the design of new supports.

TL;DR: In this paper, the authors studied the performance of the transesterification of soybean oil with methanol over basic solid catalysts such as: MgO, ZnO, Al 2 O 3, and mixed oxides derived from hydrotalcite-like compounds (Mg/Al and Zn/Mg /Al).

TL;DR: In this article, the additive effect of noble metals such as Pt, Pd, Rh and Ru to the Ni/CeO2/Al2O3 catalyst was investigated.

TL;DR: In this paper, Ni catalysts supported with both CeO2 and ZrO2 are shown to be promising catalysts for dry reforming of methane with carbon dioxide within a certain composition range.

TL;DR: In this paper, the authors investigated the power-law kinetics of CO and H 2 oxidation over a CuO-CeO 2 catalyst under reaction conditions of preferential CO oxidation (PROX) in hydrogen-rich mixtures with CO 2 and H2 O. The experimental results showed that the CO oxidation rate was essentially independent of H 2 and O 2 concentrations.

TL;DR: In this paper, a novel visible light sensitive photocatalyst, AgSbO3, was prepared by a conventional solid-state reaction method, which can absorb visible light with wavelength up to about 480nm.

TL;DR: In this paper, a novel TiO 2 immobilized hydrophobic montmorillonite photocatalysts were designed and prepared for the advanced oxidation of persistent organic pollutants in water, which combined the pre-adsorption and concentrated effects for aqueous micro-organic pollutants with the photocatalysistic destruction of organic pollutants.

TL;DR: In this paper, a simple kinetic model incorporating the coupled effect of the adsorptive photocatalytic reduction and oxidation was developed to model the formation rates of hydrogen and methane through photocatallytic reduction of carbon dioxide with water vapour.

TL;DR: In this paper, perovskite-type oxides LaRu x Ni 1-x O 3 (0.0 < x < 1.0) were studied in order to find alternative catalysts, which can be more resistant against coke deactivation.

TL;DR: In this paper, the authors investigated the promotional effect of alkali metals in the soot combustion activity of ceria-based catalysts and pointed out that the order of activity in soot oxidation depends on the nature of the catalysts, the amount of the metal and the choice of the precursors.

TL;DR: In this paper, the reaction was studied under continuous flow using an mixture of CH 4 :CO 2 ǫ = 1:1, and the solids were characterized by X-ray diffraction, BET specific surface area and temperature-programmed reduction (TPR).

TL;DR: In this article, a study on the removal of cadmium ions from aqueous solutions by synthetic hydroxyapatite (Ca(10)(PO(4))(6)(OH)(2), HAP) with different morphologies was conducted in batch conditions, such as equilibration time, initial concentration of metal ion, the amount of HAP, pH value of solution and specific surface area on the sorption amount of Cd(2+) were studied and discussed.

TL;DR: In this paper, the results of adsorption and temperature-programmed desorption of NO were explained using diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) coupled with temperatureprogrammed experiments in environmental cell.

TL;DR: In this article, a simplified mechanism for the catalytic oxidation of o-xylene over Pd/Al(2)O(3) was proposed, based on the behavior of adsorbed species.

TL;DR: In this article, the reduction of NOx species adsorbed at different temperatures was investigated over a model LNT Pt-Ba/Al2O3 catalyst and over the corresponding Ba/Al 2O3 system to address the role of the noble metal component in such mechanisms.

TL;DR: In this paper, high-surface area and well-ordered mesoporous Cr-incorporated SBA-15 (Cr-SBA15) and SBA15-supported chromia (CrOx/SBA-2015) with Cr surface density = 0.05-1.11 and 0.53-Cr-atom/nm2, respectively, were obtained using the one-step synthesis and incipient wetness impregnation method, respectively.