Finely dispersed Pd-Zn catalyst supported on an organized mesoporous alumina for hydrogen production by methanol steam reforming

摘要

This work describes the preparation and the characterization of a catalytic system for the production of hydrogen by oxidative steam reforming of methanol(OSRM),prepared by deposition of palladium acetate on an organized mesoporous alumina,followed by pre-reduction at room temperature with a zinc borohydride solution.This procedure allows one to obtain intimately interacting Pd-Zn species that easily generate the 1:1 Pd/Zn alloy,as a result of thermal treatment in reducing conditions at 500 deg C.The alloy formation was clearly proven by X-ray diffraction measurements.The samples were also characterized by N_2 adsorption-desorption,atomic absorption spectroscopy(AAS),X-ray photoelectron spectroscopy(XPS),infrared spectroscopy(FT-IR).This type of material was found to be active in the oxidative steam reforming of methanol,in the temperature range between 100 and 400 deg C,producing a hydrogen/CO_2 mixture with low concentrations of CO.