Improved Pd/gamma-Al2O3-Ce catalysts for benzene combustion
Por:
Padilla J.M., Del Angel G., Navarrete J.
Publicada:
1 abr 2008
Resumen:
The catalytic oxidation of benzene on Pd (0.5 wt%)/gamma-Al2O3-Ce catalysts with 1, 5 and 10 wt% Ce was investigated. The alumina-Ce supports were prepared by adding a Ce-nitrate precursor to an aluminum boehmite. The presence of Lewis acid sites was determined by FTIR-pyridine adsorption spectroscopy. By FTIR-CO adsorption, it was found that the presence of Ce leads to the stabilization of PdO on the supports. The presence of the PdO species on the Pd/gamma-Al2O3-Ce catalysts was confirmed by X-ray photoelectron spectroscopy (XPS). The combustion of benzene (2600 ppm) in air was carried out at atmospheric pressure. Two behaviors were observed: for the catalysts with low Ce content (1%) and without Ce, the combustion occurs in a broad temperature range 100-280 degrees C, meanwhile, catalysts with high Ce contents (5, 10%), the benzene combustion occurs in the range 220-280 degrees C. An activation treatment on Pd/gamma-Al2O3-Ce catalysts with a reactant mixture at 250 degrees C for 20
Filiaciones:
Padilla J.M.:
Universidad Autónoma Metropolitana, Departamento de Química, Area Catalisis, Av. San Rafael Atlixco No. 186, Iztapalapa, AP. 55-534, Mexico, D.F., Mexico
Del Angel G.:
Universidad Autónoma Metropolitana, Departamento de Química, Area Catalisis, Av. San Rafael Atlixco No. 186, Iztapalapa, AP. 55-534, Mexico, D.F., Mexico
Navarrete J.:
Instituto Mexicano del Petróleo, Programa de Ingeniería Molecular, México, D.F. 07730, Mexico
|