不同Cu源与Zn源对CuZnAl催化剂催化合成气制乙醇性能的影响

Effect of the source of Cu and Zn on the ethanol synthesis from syngas over CuZnAl catalyst

摘要: 采用完全液相法以不同的铜源和锌源为原料制备了CuZnAl催化剂,在浆态床反应器中考察了其催化合成气合成乙醇的性能,并采用XRD、H₂-TPR、NH₃-TPD-MS及BET技术对催化剂进行表征。结果表明,以乙酸铜替换硝酸铜,抑制了热处理过程中Cu₂O的还原,提高了催化剂的比表面积,为催化剂具有较高的乙醇选择性提供了适宜的酸中心和孔径,其总醇选择性达45.6%,总醇中乙醇所占比例达28.7%。

Abstract: CuZnAl catalysts were prepared using different sources of copper and zinc through complete liquid-phase technology. The catalytic performances for the ethanol synthesis from syngas were investigated in a slurry phase reactor. The catalysts were characterized by XRD, H₂-TPR, NH₃-TPD-MS and BET technology. The results suggest that replacing copper nitrate with copper acetate would restrain the reduction of Cu₂O in the heat treatment and raise the surface areas of the catalysts. It also provides suitable acid sites and pore sizes for higher ethanol selectivity. The selectivity of total alcohols reaches 45.6% and the ethanol selectivity accounts for 28.7%.