前驱体和沉淀剂浓度对CuO/ZnO/CeO<sub>2</sub>-ZrO<sub>2</sub>甲醇水蒸气重整制氢催化剂性能的影响

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: 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0.1mol/L,沉淀剂浓度为0.5mol/L时,所得催化剂CO选择性最小,催化活性最佳。在360h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。

Abstract: 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 0.1mol/L and the precipitant concentration was 0.5mol/L, the catalyst exhibited the best activity with suppressed CO formation. During 360h 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 360h run time.