以草酸为沉淀剂制备了一种绣球状CuO-CeO₂(简称CuCe)催化剂,考察了其用于富氢条件下CO选择性氧化时工艺条件、活性组分的负载量等对催化性能的影响。结果表明,600℃的焙烧温度有利于催化剂的催化活性;且5% CuCe催化剂具有最佳的催化活性和稳定性。CO完全转化温度区间为105~150℃,且在105℃时O₂对CO的选择性高达95%;同时,在110 h内CO转化率基本保持在100%。XRD与Raman表征结果表明,活性组分CuO被高度分散于载体CeO₂表面,且部分Cu物质与CeO₂晶格形成了Cu-Ce固溶体,从而产生了更多的氧空位和Ce³⁺。XPS测试结果表明,5% CuCe催化剂具有更高的氧空位浓度与Cu⁺的相对质量分数,导致其具有最佳的催化性能。

A kind of hydrangea-like CuO-CeO₂ catalyst for CO selective oxidation in hydrogen-rich condition is prepared by using oxalic acid as the precipitant,and the effects of process conditions and the loading amount of active component on the catalytic performance of CuO-CeO₂ catalyst are investigated.The results indicate that the calcination temperature at 600℃ is more favorable to the catalytic activity.The 5% CuO-CeO₂ catalyst has the best catalytic activity and better stability,over which the temperature window for full conversion of CO is 105-150℃,and the selectivity of O₂ to CO is as high as 95% at T=105℃.Meanwhile,the conversion rate of CO basically maintains at 100% within 110 h of operation time.Through XRD and Raman analysis,it is found that CuO,the active component,disperses highly on the surface of CeO₂ support,and even part of Cu material enters into CeO₂ lattice to form a Cu-Ce solid solution,which generates more oxygen vacancies and Ce³⁺.Through XPS test,it is suggested that 5% CuO-CeO₂ catalyst has more oxygen vacancies and higher Cu⁺ content,which results in the best catalytic activity.

林倩倩(1997-),女,硕士研究生,研究方向为富氢气氛下CO选择性氧化(H₂的纯化),linqianqian0107@163.com。