The influence of support in using the different sources (commercial ox ides, metal alkoxides, TiCl4, Ti(SO4)2) of metal oxides as supports (TiO2 (anatase), γ-Al2O3) and of the pretreatment of the oxides (evacuation at 773 K) on the activity of Pd catalysts has been studied to find a favorable catalyst for methanol decomposition to H2 and CO. The pretreatment by evacuation gave somewhat high surface area as well as high catalytic activity in comparison with that by no-evacuation. Catalytic activity (conversion to CO) increased as the surface area of these catalysts increased. The specific activity for TiO2-support was higher than that for Al2O3-support (Fig.1). The catalytic activity was found to be proportional to the degree of dispersion of Pd on both TiO2 and Al2O3 supports (Fig.2).
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