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An as-synthesized 8.8wt% Pd/ZnO/Al2O3 catalyst was either pretreated under O2 at 773 K followed by H2 at 293 K or under H2 at 773 K to obtain, respectively, a supported metallic Pd° catalyst (Pd°/ZnO/Al2O3) or a supported PdZn alloy catalyst (PdZn/ZnO/Al2O3). Both catalysts were studied by CO adsorption using FTIR spectroscopy. For the supported PdZn alloy catalyst (PdZn/ZnO/Al2O3), exposure to a...
The species formed by exposure of a Pd/ceria catalyst to SO 2 under various conditions have been studied using temperature-programmed desorption (TPD) and FTIR. For adsorption of SO 2 between 298 and 473 K, a molecular SO 2 species adsorbs on the surface, possibly as a surface sulfite, and this species converts to a sulfate above 473 K. Exposure of Pd/ceria to SO 2 ...
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