采用共沉淀法制备了 CuO/ZnO/CeO2/ZrO2甲醇水蒸气重整制氢催化剂,探讨了沉淀温度对催化剂活性和 CO 选择性的影响,并采用 N2吸附-脱附、X 射线衍射、程序升温还原和 N2O 滴定等手段对催化剂进行了表征.结果表明,沉淀温度对CuO/ZnO/CeO2/ZrO2催化剂结构和性质的影响很大.当沉淀温度为60°C 时,所得催化剂的性能最佳.与工业催化剂相比,以CeZr 取代 Al2O3为载体,可大幅度提高催化剂低温活性,有效抑制 CO 的生成,简化了后续 CO 的处理过程.这对甲醇燃料电池重整制氢体系的应用具有重要意义.
A series of CuO/ZnO/CeO2/ZrO2 catalyst samples for methanol steam reforming were prepared by a co-precipitation procedure, and the effect of precipitation temperature on the catalytic performance was investigated. All the samples were characterized by N2 adsorp-tion, X-ray diffraction, temperature-programmed reduction, and N2O titration. It is shown that the precipitation temperature remarkably in-fluenced the catalyst structure and property. When the precipitation temperature was 60 oC, the catalyst exhibited the best activity with sup-pressed CO formation. Compared with commercial catalyst (CB-7), the CeZr as support instead of the Al2O3 can dramatically improve the conversion at low temperature, effectively inhibit the CO generation, reduce the subsequent CO removing process, which was helpful for methanol stream reforming technology using in the proton exchange membrane fuel cell applications.
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