采用共沉淀法制备了不同Cu/Zn摩尔比的Cu-Zn/Al催化剂,利用N₂-吸脱附、XRD、SEM、H₂-TPR和NH₃-TPD等手段对其进行一系列表征,并评价其催化甲醇裂解为原位氢源再用于乙酸甲酯加氢制乙醇的效果。结果表明,Cu/Zn摩尔比对催化剂的比表面积、铜物种的分散度和表面酸性起着调控作用;n(Cu)∶n(Zn)为1∶2的Cu-Zn/Al催化剂表现出优异的催化活性,在280℃、3 MPa、LHSV为1 h^-1、n(MeOH)∶n(MA)=3的条件下,乙酸甲酯转化率为91.1%,乙醇选择性为83.6%;经过200 h的稳定性测试,催化剂并没有表现出明显的失活。

Cu-Zn/Al catalysts with different Cu/Zn ratios are prepared via co-precipitation method,and characterized by a series of N₂-sorption and desorption,XRD,SEM,H₂-TPR and NH₃-TPD.Their effects are evaluated in catalyzing methanol to crack as an in-situ hydrogen source for the hydrogenation of methyl acetate to ethanol.The results show that Cu/Zn ratio modulates the specific surface area,copper species dispersion and surface acidity of the catalysts.Cu-Zn/Al catalyst with a Cu/Zn ratio of 1/2 exhibits an excellent catalytic activity,over which the conversion of methyl acetate reaches 91.1% and the yield of ethanol reaches 83.6% at 280℃,3 MPa,LHSV=1 h^-1,n(methanol)/n(methyl acetate)=3.After 200 h of stability test,the catalyst does not show significant deactivation.

吴涛(1996-),男,硕士生,研究方向为能源化工,wutao@tyut.edu.cn