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Perez-Hernandez R.,Instituto Nacional de Investigaciones Nucleares | Avendano A.D.,Centro Universitario Of Vinculacion Buap | Rubio E.,Centro Universitario Of Vinculacion Buap | Rodriguez-Lugo V.,Centro Universitario Of Vinculacion Buap
Topics in Catalysis | Year: 2011

Pd/ZrO2-TiO2 catalysts were synthesized by sol-gel method and studied on the steam reforming of methanol reaction for hydrogen production. X-ray diffraction patterns of the Pd supported on single oxides showed crystalline structures associated with the zirconia or titania respectively. However, the XRD pattern of the mixed ZrO2-TiO 2 oxide showed broad diffraction pattern consistent with an amorphous material. The reducibility of the PdO supported on single and mixed oxides showed a negative peak associated with the desorption of H2 due to the decomposition of Pd-hydride (PdH); as well as, positive peaks related with the hydrogen consumption on the reduction of the PdO supported. Catalytic activity on the palladium supported on the mixed ZrO2-TiO2 oxide showed higher catalytic activity than the Pd supported on the single TiO2 or ZrO2 oxides. This finding was associated at the higher Pd species present in the Pd/ZrO2-TiO2 than on the Pd/ZrO2 or Pd/TiO2 catalysts how was observed by TPR. © 2011 Springer Science+Business Media, LLC.

Perez-Hernandez R.,Instituto Nacional de Investigaciones Nucleares | Gutierrez-Martinez A.,Instituto Nacional de Investigaciones Nucleares | Palacios J.,Instituto Nacional de Investigaciones Nucleares | Vega-Hernandez M.,Autonomous University of Puebla | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2011

Single ZrO2 and mixed CeO2-ZrO2 oxides with different CeO2/ZrO2 ratios were prepared by the sol-gel method and the CeO2 by precipitation. The prepared support were impregnated with an aqueous solution of NiCl2·6H 2O at an appropriate concentration to yield 3 wt.% of nickel respectively in the catalysts. Catalytic materials were characterized by BET (N2 adsorption-desorption), SEM-EDS, XRD and TPR. The oxidative steam reforming of methanol (OSRM) reaction was investigated on these catalysts for H2 production as a function of temperature. Depending of the CeO 2/ZrO2 ratio; the catalysts composition has a significant influence on the surface area (BET), reduction properties and methanol conversion. XRD patterns of the Ni-base catalysts showed well defined diffraction peaks of the metallic Ni except on the Ni/CeO2 catalyst, suggesting that on this sample all of the active phase was highly dispersed. Ni/Ceria-rich catalysts were vastly active for OSRM, giving a total CH 3OH conversion at 325 °C with GHSV = 0.3 × 105 h-1. They also showed close selectivity toward H2, with high selectivity to CO2 in all range of temperatures, this suggests that the reverse WGS reaction does not occur on these samples. It seems that the nickel is the phase mainly responsible of hydrogen production although the CeO2/ZrO2 support reduces the CO formation. Copyright © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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