Cr掺杂对Cu-Ce复合催化剂催化甲醇水蒸气重整制氢的影响

采用浸渍法制备了不同Cr含量的Cr/Cu-Ce催化剂,通过N_2O滴定、H_2-TPR和XPS等表征,对其结构、性质和催化性能进行了探究。结果表明,Cr助剂会改变Cu-Ce催化剂的铜比表面积、CuO还原温度以及氧空穴含量。其中,添加3%Cr的催化剂的Cu比表面积较大,CuO还原温度较低,氧空穴较多,进而表现出优良的催化性能。当反应温度为533 K,n(水)∶n(甲醇)=1.2∶1,甲醇和水的进料量为0.072 mL/min时,其催化效率达100%,重整气体组分中的CO体积分数为0.15%。与未掺杂Cr助剂的催化剂相比,其催化效率提高了10%,重整气体组分中的CO体积分数降低了0.34%。

Effect of Cr doping on hydrogen production via methanol steam reforming over Cu-Ce composite catalysts

Cr/Cu-Ce catalyts with different Cr contents were prepared by impregnation method, and their structures, properties and catalytic performance were investigated using N₂O titration, H₂-TPR and XPS techniques. It is found that the Cr doping changs the specific surface area of copper, the reduction temperature of CuO and oxygen vacancies of the Cu-Ce catalysts. In addition, the catalyst with 3% Cr addition has larger Cu specific surface area, lower CuO reduction temperature and more oxygen vacancies, thus exhibits excellent catalytic performance. The catalytic efficiency reaches 100% and CO volume fraction in outlet gas is 0.15% when the reaction temperature is 533 K, n(water):n(methanol) is 1.2:1 and the feeding rate of methanol and water is 0.072 mL/min. Compared with the un-doped Cr catalyst, the catalytic efficiency increases by 10% and the volume fraction of CO in the outlet gas decreases by 0.34%.