Gold Functionalized Supported Ionic Liquids Catalyst for CO Oxidation.

The present study tries to give an insight to the combination of the homogeneous and heterogeneous catalytic properties in a new class of materials. Well dispersed gold nanoparticles on an ionic liquid layer supported on a mineral carrier have been prepared. This work is concentrated on the characterizations and understanding of the interactions between all the components of the catalytic system. The application of the materials in the reaction of oxidation of carbon monoxide shows rather unexpected results¿a good catalytic activity completely independent of the temperature.L. Bobadilla acknowledges Junta de Andalucía (Project PDG-TEP01965). S. Ivanova and A. Penkova acknowledge MEC for their contracts Ramon y Cajal and Juan de la Cierva.Peer Reviewe

Hierarchically Porous Gd3+-Doped CeO2 Nanostructures for the Remarkable Enhancement of Optical and Magnetic Properties

Rare earth ion-doped CeO2 has attracted more and more attention because of its special electrical, optical, magnetic, or catalytic properties. In this paper, a facile electrochemical deposition route was reported for the direct growth of the porous Gd-doped CeO2. The formation process of Gd-doped CeO2 composites was investigated. The obtained deposits were characterized by SEM, EDS, XRD, and XPS. The porous Gd3+- doped CeO2 (10 at% Gd) displays a typical type I adsorption isotherm and yields a large specific surface area of 135 m2/g. As Gd3+ ions were doped into CeO2 lattice, the absorption spectrum of Gd3+-doped CeO2 nanocrystals exhibited a red shift compared with porous CeO2 nanocrystals and bulk CeO2, and the luminescence of Gd3+-doped CeO2 deposits was remarkably enhanced due to the presence of more oxygen vacancies. In addition, the strong magnetic properties of Gd-doped CeO2 (10 at% Gd) were observed, which may be caused by Gd3+ ions or more oxygen defects in deposits. In addition, the catalytic activity of porous Gd-doped CeO2 toward CO oxidation was studied

Procedimiento de preparación de nanopartículas de aleaciones Ni-Sn y su uso en reacciones de reformado

Procedimiento de preparación de nanopartículas de aleaciones Ni-Sn y su uso en reacciones de reformado. La presente invención se refiere a un procedimiento para la preparación de nanopartículas de Ni-Sn que comprende - preparar una disolución de un carboxilato de níquel en el que dicho carboxilato tiene entre 1 y 6 átomos de carbono, y un halogenuro de estaño en un disolvente orgánico - añadir PVP (polivinilpirrolidona) - mantener en agitación hasta obtener una disolución homogénea, - añadir un compuesto reductor inorgánico, - poner a reflujo, obteniendo una disolución coloidal, - añadir un disolvente orgánico polar a la disolución coloidal resultante anteriormente, provocando la precipitación de un sólido, y al uso de dichas partículas en reacciones de reformado.Peer reviewedUniversidad de Sevilla, Consejo Superior de Investigaciones Científicas (España)A1 Solicitud de patentes con informe sobre el estado de la técnic

A new intersecting tunnel structure in the A(I)M(III)[PO3(OH)](2) series for A(I) = Ag, M-III = In: Analysis of structural relationships

International audienceA new indium hydroxyphosphate containing silver, AgIn[PO3(OH)](2), has been synthesized using hydrothermal method. It crystallizes in the P2(1)/c space group with the cell parameters a = 6.6400(2) angstrom, b = 14.6269(6) angstrom, c = 6.6616(4) angstrom, beta = 95.68](5)degrees, V = 643.82(6) angstrom(3), Z = 4. Its three-dimensional framework, built up of corner-sharing PO3(OH) tetrahedra and InO6 octahedra, presents intersecting tunnels running along \textless 111 \textgreater and [100] directions, in which the Ag+ cations are located. The presence of hydroxyl groups has been confirmed from IR spectroscopy studies and hydrogen atoms were located from the single crystal X-ray diffraction study. The structural relationships with the other compounds of general formula A(I)M(III)[PO3(OH)](2) are analyzed. (C) 2008 Elsevier Masson SAS. All rights reserved

A new intersecting tunnel structure in the A(I)M(III)[PO3(OH)](2) series for A(I) = Ag, M-III = In: Analysis of structural relationships

International audienceA new indium hydroxyphosphate containing silver, AgIn[PO3(OH)](2), has been synthesized using hydrothermal method. It crystallizes in the P2(1)/c space group with the cell parameters a = 6.6400(2) angstrom, b = 14.6269(6) angstrom, c = 6.6616(4) angstrom, beta = 95.68](5)degrees, V = 643.82(6) angstrom(3), Z = 4. Its three-dimensional framework, built up of corner-sharing PO3(OH) tetrahedra and InO6 octahedra, presents intersecting tunnels running along \textless 111 \textgreater and [100] directions, in which the Ag+ cations are located. The presence of hydroxyl groups has been confirmed from IR spectroscopy studies and hydrogen atoms were located from the single crystal X-ray diffraction study. The structural relationships with the other compounds of general formula A(I)M(III)[PO3(OH)](2) are analyzed. (C) 2008 Elsevier Masson SAS. All rights reserved

Promoting effect of Sn on supported Ni catalyst during steam reforming of glycerol

The promoting effect of Sn on the catalytic performance of supported Ni catalyst in the reaction of glycerol steam reforming was studied. The physico-chemical properties of the prepared samples were investigated by X-ray fluorescence (XRF), BET surface area, in situ X-ray diffraction (XRD), laser Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and temperature-programmed oxidation (TPO) techniques. The characterization results of the samples after reduction treatment (in the same conditions than the activation before catalytic activity measurements) revealed the formation of Ni-Sn alloy. The Sn-doped catalyst exhibited a high activity and it was demonstrated that the Sn addition increase the catalyst stability and durability by decreasing the coke deposition