Abstract
Hydrogen production by partial oxidation of methanol (CH 3OH+1/2 O 2 ⇄2 H 2+CO 2) was studied over ZnO- and ZrO 2-supported Pd catalysts. Catalyst performance was investigated under feed ratios O 2/CH 3OH (molar) of 0.3 and 0.5 at 503–543 K. Irrespective of the large difference in BET area of Pd/ZnO and Pd/ZrO 2 catalysts, significant differences were observed when comparing H 2 selectivities. For the 1% Pd/ZnO catalyst, reaction occurs through consecutive oxidation → reforming steps. However, the behavior of catalyst 1% Pd/ZrO 2 approached that expected for Group 8 metals, that is, although the oxidation products are observed as for the catalyst 1% Pd/ZnO, the decomposition reaction seems to occur to a greater extent. Catalyst characterization by TPR, X-ray diffraction and XPS revealed that PdZn alloys can be formed upon reduction of Pd/ZnO catalysts at moderate temperatures.
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