Synergetic Effects of PdO Species on CO Oxidation over PdO-CeO2 Catalysts
Synergetic Effects of PdO Species on CO Oxidation over PdO-CeO2 Catalysts
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DOI：
10.1021/jp2056688
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发表时间：
2011-10-13
影响因子：
3.7
通讯作者：
Luo, Meng-Fei
中科院分区：
文献类型：
--
作者：
Meng, Lian;Jia, Ai-Ping;Luo, Meng-Fei
The PdO/Ce1-xPdxO2-delta catalyst prepared by a solution-combustion method contained free surface PdO species and PdO species in Ce1-xPdxO2-delta solid solution, whereas the PdO/CeO2 catalyst prepared by an impregnation method contained only free surface PdO species. The free surface PdO species could be removed by nitric acid. Contributions of the PdO species to catalytic CO oxidation were quantitatively evaluated. The free surface PdO species in the PdO/Ce1-xPdxO2-delta catalyst had the highest activity (969.3 mu mol(CO) g(Pd)(-1) s(-1)), those in the PdO/CeO2 catalyst had medium activity (109.0 mu mol(CO) g(Pd)(-1) s(-1)), and the PdO species in the Ce1-xPdxO2-delta solid solution had the lowest activity (13.2 mu mol(CO) g(Pd)(-1) s(-1)). Synergetic effects of PdO species were responsible for the enhanced reactivity of the PdO/Ce1-xPdxO2-delta catalyst, as the free surface PdO species provided CO chemisorption sites and the Ce1-xPdxO2-delta solid solution generated more oxygen vacancies for oxygen activation.
