Influence of the support structure and composition of Ni-Cu-based catalysts on hydrogen production by methanol steam reforming

Cu and Ni were supported on ZrO2 by sequential impregnation method, and tested in the steam reforming of methanol (SRM) reaction for H-2 production as a function of temperature. Four bimetallic catalysts were investigated, differing in ratio of nickel and copper (Cu: Ni = 1: 4 or 4: 1) and annealing temperature. The synthesized catalysts were characterized by N-2 physisorption, DSC/TGA, X-ray diffraction, SEM, TEM. It was shown, that support structure has the main influence on composites activity, while the nature of a dominant metal affected on the selectivity of the resulting catalysts. The activity of catalysts decreases with increasing of materials crystallinity degree. The most active were samples coated with amorphous shell. The selectivity of copper catalysts is higher than nickel-based. Among the tested catalysts, the most active and selective catalyst was the sample Ni0.2-Cu0.8/amorphous ZrO2. Copyright (C) 2015, Hydrogen Enerd Publications, LLC. Published by Elsevier Ltd. All rights reserved.