Highly efficient Pd/Al2O3-Ce0.6Zr0.4O2 catalyst pretreated by H2 for low-temperature methanol oxidation
Highly efficient Pd/Al2O3-Ce0.6Zr0.4O2 catalyst pretreated by H2 for low-temperature methanol oxidation
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DOI：
10.1039/c1cy00282a
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发表时间：
2011-10
影响因子：
5
通讯作者：
Yongjin Luo;Yihong Xiao;G. Cai;Yong Zheng;K. Wei
中科院分区：
文献类型：
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作者：
Yongjin Luo;Yihong Xiao;G. Cai;Yong Zheng;K. Wei
研究发现，在Pd/Al_2 O_3-Ce_（0.6）Zr_（0.4）O_2催化剂上进行预还原，可以显著提高甲醇低温完全氧化的催化性能。在67 °C下可以快速达到起燃温度（T50）。TPR图谱表明，氢气预处理后，PdOx和CeO 2之间形成了更强的相互作用，从而使还原度大大提高。XPS分析证实了这一点，并发现了高电荷态Pdδ+（δ > 2）物种的产生。结果表明，预还原后PdOx与CeO 2之间存在较强的相互作用是催化剂活性显著提高的主要原因。
We report an interesting finding that the catalytic performance of Pd/Al2O3-Ce0.6Zr0.4O2 catalyst toward complete oxidation of methanol at low temperature could be greatly enhanced by prereduction in hydrogen. The light-off temperature (T50) could be reached rapidly at 67 °C. TPR patterns showed that the reducibility is highly increased due to the formation of stronger interactions between PdOx and CeO2 after hydrogen pretreatment. It was confirmed by XPS analysis, and the generation of higher charged Pdδ+ (δ > 2) species were discovered. As a result, it was induced that the presence of stronger interactions between PdOx and CeO2 after prereduction mainly contributes to the remarkably enhanced activity.