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采用浸渍法以Cu(CH3COO)2为前驱体,在N2气氛下于不同温度下焙烧,制备了CuOx/CeO2催化剂。结合XRD,H2-TPR,XPS等表征技术,以及CO-PROX(Preferential Oxidation of CO)反应测试,获得了CuOx/CeO2催化剂中不同Cu物种随焙烧温度变化的分布信息及其对CO-PROX催化活性的影响。结果表明:CuOx/CeO2催化剂CO-PROX催化活性变化的趋势与催化剂表面分散态Cu+物种变化趋势一致,随着焙烧温度从200℃升至500℃,催化剂表面的分散态Cu+先增加后减少,当分散态Cu+在焙烧温度250～400℃达到最多时,其催化活性最好,随后下降,说明分散态Cu+对CO-PROX反应活性起关键作用。
The CuOx / CeO2 catalyst was prepared by impregnation method using Cu (CH3COO) 2 as precursor and calcined at different temperatures under N2 atmosphere. Combining the characterization techniques of XRD, H2-TPR, XPS and CO-PROX (Preferential Oxidation of CO) reaction, the distribution information of Cu species in CuOx / CeO2 catalyst with calcination temperature and its catalytic activity on CO-PROX Impact. The results show that the change trend of CO-PROX catalytic activity of CuOx / CeO2 catalyst is consistent with that of Cu + species dispersed on the surface of catalyst. As the calcination temperature increases from 200 ℃ to 500 ℃, the dispersed Cu + of catalyst surface first increases and then decreases. When the calcined temperature is 250 ~ 400 ℃, the Cu + is the most active and then declines, indicating that the dispersed Cu + plays a key role in the CO-PROX reactivity.