Abstract
A previously proposed method for depositing Ag nanoparticles on silica particles was extended to the preparation of ZnO-supported Pd (Pd/ZnO) catalysts. The method presented in this work consists of two steps: (1) Sn2+ ions are adsorbed on the surfaces of ZnO particles, and (2) Pd2+ ions added are reduced by oxidization of Sn2+ to Sn4+ and simultaneously adsorbed on the surface. TEM observations revealed that Pd nanoparticles with an average size of 2-3 nm were formed on the 20 nm ZnO particles. The Pd nanoparticles were transformed into a Pd-Zn alloy by partial oxidation and steam reforming of methanol, and consequently the Pd/ZnO attained CH3OH conversion efficiencies of 35-50% at reaction temperatures of 310-370°C.
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