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采用浸渍法制备了Cu O/Co3O4-Ce O2(Cu Co Ce10)催化剂,考察了在不同温度(250、300、350、400和450℃)焙烧后的样品在富氢气氛中对CO优先氧化反应的催化性能。应用BET、XRD、H2-TPR及XAFS技术详细表征了催化剂的结构与性能。结果表明,不同温度焙烧的催化剂中,铜物种均主要以Cu O相存在;350℃焙烧的Cu Co Ce10催化剂具有最大的比表面积和最好的氧化还原性能,在98~173℃的温度范围内能够将CO完全转化为CO2,呈现出最宽的CO优先氧化可操作温度窗口,以及良好的催化活性稳定性。
The CuO / Co3O4-CeO2 (CuCo Ce10) catalyst was prepared by impregnation method. The effects of preferential oxidation of CO on hydrogen-enriched carbon in the samples calcined at different temperatures (250, 300, 350, 400 and 450 ℃) The catalytic performance. The structure and properties of the catalysts were characterized in detail by BET, XRD, H2-TPR and XAFS techniques. The results show that the copper species mainly exist as CuO phase in the catalysts calcined at different temperatures. The CuCo Ce10 catalyst calcined at 350 ℃ has the largest specific surface area and the best redox performance. Under the temperature range of 98 ~ 173 ℃ The ability to fully convert CO to CO2 presents the widest CO preferential oxidation operable temperature window and good catalytic activity stability.