Cu-Zn-Al-Zr催化剂在CO_2加氢制甲醇反应中的性能研究

Study on performance of Cu-Zn-Al-Zr catalyst in hydrogenation of CO_2 to methanol

采用共沉淀法制备了Cu-Zn-Al-Zr复合氧化物催化剂用于CO2加氢制甲醇反应。与工业用Cu-Zn-Al催化剂进行了比较,同时进行了Cu-Zn-Al-Zr催化剂稳定性试验和试验前后样品的物化表征。结果表明:在相同的反应条件下,用Cu-Zn-Al-Zr催化剂的甲醇收率较用Cu-Zn-Al催化剂得到显著提高;在200 h的稳定性试验中,Cu-Zn-Al-Zr催化剂显示较好的催化稳定性;催化剂诱导期性能的下降归因于金属Cu晶粒的长大和表面沉积物的形成,而催化剂中的微孔分布对反应影响不显著。

Cu-Zn-Al-Zr composite oxides catalyst is prepared and used for hydrogenation of CO2 to methanol.The performance between the Cu-Zn-Al-Zr catalyst and the industrial Cu-Zn-Al catalyst is compared.Meanwhile,the catalytic stability test of the Cu-Zn-Al-Zr catalyst in hydrogenation of CO2 to methanol is investigated,and the catalysts samples before and after test are physicochemically characterized.The results show that the methanol yield over Cu-Zn-Al-Zr catalyst is considerably increased compared with that over Cu-Zn-Al catalyst under the same test conditions.The Cu-Zn-Al-Zr catalyst showes good catalytic stability during the test period of more than 200 h.The slight decrease of catalytic performance in the induction phase should be attributed to the growing-up of copper crystallites and the formation of surface deposit.The influence of the micropore distribution in catalyst on the reaction is non-significant.