No abstract

No abstract

ᠪҽ╫ɩɋȵ֭ᥴకᲦȡ᧸ǦǮɩɇɖʀɳȤոɛ‫ك‬ᕮ⋛ᕧტ‫ۀ‬අ Pd ╮ǽΰ⓯ ତአ↽ᨇ í ɿ‫ޗ‬ቆᗱ౪ɿ‫ڢ‬ᑼӡడଉ ɿ͑ʅᨇ ኇ‫ل‬গકগકрకકᮾ᳣ᲇ‫ك‬કకકଗფࢫ980-8579 ͜۞లԂ⊡ٚ∕ఫઆԂ⊡ 6-6-07 ଉ ᮸႒ᰓʄకᏡጋ࣠ᬬᮾ᳣ཀࢫ235-8501 ᑥᘛలᰚٚᄽ˛‫ڤ‬ᨊ A previously proposed method for depositing Ag nanoparticles on silica particles was extended to the preparation of ZnO-supported Pd PdZnO catalysts. The method presented in this work consists of two steps: 1 Sn 2ࢪ ions are adsorbed on the surfaces of ZnO particles, and 2 Pd 2ࢪ ions added are reduced by oxidization of Sn 2ࢪ to Sn 4ࢪ 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 PdZnO attained CH 3 OH conversion efficiencies of 35-50ಚ at reaction temperatures of 310-370c C.