前驱体和沉淀剂浓度对CuO/ZnO/CeO2-ZrO2甲醇水蒸气重整制氢催化剂性能的影响

摘要

A series of CuO/ZnO/CeO2-ZrO2 catalysts for methanol steam reforming were prepared by a co-precipitation procedure, and the effect of precursor and precipitant concentration on the catalytic perforemance was investigated. All the catalysts were characterized by N2 adsorption, XRD, H2-TPR, and XPS. It is shown that the precursor and precipitant concentration remarkably influenced the catalyst structure and property. When the precursor concentration was 0. 1 mol/L and the precipitant concentration was 0. 5 mol/L, the catalyst exhibited the best activity with suppressed CO formation. During 360 h run time, the highest methanol conversion reached 100%, the H2 concentration was above 74. 5%, and the CO concentration was below 0. 8%in the reforming gas. The catalyst had excellent reforming performance without deactivation during 360 h run time.%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,探讨了前驱体和沉淀剂浓度对催化剂性能的影响,并采用BET、XRD、H2-TPR和XPS等手段对催化剂进行了表征。结果表明,前驱体和沉淀剂浓度对催化剂的结构和性能影响很大,当前驱体浓度为0.1 mol/L,沉淀剂浓度为0.5 mol/L时,所得催化剂CO选择性最小,催化活性最佳。在360 h稳定实验中,甲醇最高转化率达100%,重整尾气中H2含量保持在74.5%以上,CO含量低于0.8%,催化剂稳定性良好。