The dependence of ZnO surface structure on Pd/ZnO-catalyzed methanol decomposition was investigated by using model catalysts consisting of Pd films and particles on ZnO(101̅0) and ZnO(0001) single crystals. XPS studies showed that vapor-deposited Pd grows two dimensionally at 300 K and agglomerates into particles upon heating. Temperature-programmed desorption (TPD) experiments showed that CO adsorption was weaker on Pd/ZnO(0001) relative to Pd/ZnO(101̅0) and that PdZn alloy formation was more facile on the ZnO(0001) compared to ZnO(101̅0). Large differences in the amount of CO produced during methanol TPD on the Pd/ZnO(0001) and Pd/ZnO(101̅0) samples were also observed and attributed to the presence of highly active sites at the Pd−ZnO(0001) interface. Comparisons to high surface area Pd/ZnO catalysts indicate that similar structural effects may also influence their reactivity.
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Hyman et al. (2009) studied this question.
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