载体焙烧气氛对甲醇水蒸气重整制氢CuO/CeO2催化剂的影响

采用沉淀法和浸渍法制备了具有氧空位的CeO₂纳米材料和甲醇水蒸气重整制氢CuO/CeO₂催化剂，探索不同焙烧气氛对CeO₂纳米材料结构、性质和甲醇水蒸气重整制氢性能的影响。采用SEM、XRD、BET、H₂-TPR、N₂O滴定和XPS等手段对催化剂进行了表征。结果表明，CuO/CeO₂催化剂的催化活性与催化剂的Cu比表面积大小、Cu-Ce的相互作用强弱、表面缺陷和表面氧空位的多少有关。其中，在氢气气氛下焙烧所得的CeO₂负载CuO后的CuO/CeO₂-H催化剂催化活性最佳。在反应温度为250℃，水醇物质的量比为1.2时，甲醇气体空速为800 h^-1，甲醇转化率达到了100%，重整尾气中CO含量为0.87%。

Effect of support calcination atmospheres on the activity of CuO/CeO2 catalysts for methanol steam reforming

In this paper, CeO₂ nanomaterials with oxygen vacancies and CuO/CeO₂ catalysts for hydrogen production from methanol steam reforming were prepared by precipitation and impregnation methods. The influence of different calcination atmosphere on the structure and properties of CeO₂ nanomaterials and the hydrogen production performance of methanol steam reforming was investigated. SEM, XRD, BET, H₂-TPR, N₂O titration and XPS were adopted to characterize the catalyst materials. The results showed that the catalytic activity of CuO/CeO₂ catalyst was closely related to the surface area of copper, the strength of Cu-Ce interaction, the number of surface defects and surface oxygen vacancies. When the reaction temperature was 250℃, the molar ratio of water to methanol was 1.2 and the gas hourly space velocity was 800 h^-1, the methanol conversion was 100% and the CO concentration in the offgas was 0.87%.