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Effect of pretreatment methods on the performance of Cu-Zr-Ce-O catalyst for CO selective oxidation

机译:预处理方法对Cu-Zr-Ce-O催化剂进行CO选择性氧化性能的影响

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摘要

用一起沉淀方法准备的 Cu-Zr-Ce-O 催化剂为公司选择氧化展出了更好催化的性能。有不同方法的 Cu-Zr-Ce-O 催化剂 pretreated 被 CO-TPR 和 XPS 技术学习。结果证明有氧的 Cu-Zr-Ce-O 催化剂 pretreated 展出了最好的催化表演并且有最宽的操作温度窗户,与从 160 ~ 200 ° C 的超过 99% 的公司变换。O 2 预告的处理在 Cu 活跃种类上引起了氧 storaged 的丰富并且支持了吸附的氧的变换进表面格子氧。它也改进了 Cu +/Cu2+ 的数量离子的对,然后为选择公司氧化在催化剂上便于 CuO 活跃种类的形成。
机译:The Cu-Zr-Ce-O catalysts prepared using the coprecipitation method exhibited better catalytic performance for CO selective oxidation. The Cu-Zr-Ce-O catalysts pretreated with different methods were studied by CO-TPR and XPS techniques.The results showed that the Cu-Zr-Ce-O catalyst pretreated with oxygen exhibited the best catalytic performance and had the widest operating temperature window, with CO conversion above 99% from 160 to 200 ℃. The O2 pretreatment caused an enrichment of the oxygen storaged on the Cu active species and promoted the conversion of adsorbed oxygen into surface lattice oxygen. It also improved the amount of Cu+/Cu2+ ionic pair, and then facilitated the formation of CuO active species on the catalyst for selective CO oxidation.

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