The dependence of ZnO surface structure on Pd/ZnO catalyzed methanol decomposition was investigated using model catalysts consisting of Pd films and particles on ZnO 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 and that PdZn alloy formation was more facile on the ZnO(0001) compared to ZnO . Large differences in the amount of CO produced during methanol TPD on the Pd/ZnO(0001) and Pd/ZnO samples was 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.
Revised: March 2, 2020 |
Published: April 30, 2009
Citation
Hyman M.P., V.M. Lebarbier, Y. Wang, A.K. Datye, and J.M. Vohs. 2009.A Comparison of the Reactivity of Pd Supported on ZnO(10(1)over-bar0) and ZnO(0001).Journal of Physical Chemistry C 113, no. 17:7251-7259.PNNL-SA-66002.