Al组分含量对CuZnAl催化剂CO加氢制乙醇和高级醇性能影响OA北大核心CSTPCD

With the decrease of crude oil reserves and the aggravation of environmental problems,it is urgent to find new technologies for producing fuels and chemicals.Cu-based catalyst is one of the important catalysts for the direct synthesis of ethanol and higher alcohols(C2+alcohols)from syngas,but it has the problem of low selectivity for target products.A series of CuZnAl catalysts(Cat-Alx)with different Al component contents(n(Al)/n(Zn))were prepared by the complete liquid-phase method.The phase compositions,texture properties and reduction properties of the catalysts were characterized by X-ray diffraction,N2 adsorption/desorption and H2-programmed temperature reduction,etc.The catalytic performances of Cat-Alx for CO hydrogenation to ethanol and C2+alcohols were studied in a simulated slurry bed reactor.The results show that Cat-A10.8 has the most abundant Cu+species and more oxygen vacancies on its surface,showing relatively optimal catalytic performance.Reaction under the conditions of 280 ℃,4 MPa and V(H2)/V(CO)=2/1 for 24 h,the CO conversion rate of Cat-A10.8 is 18.45％,and the total alcohols selectivity is 30.34％,and the proportion of ethanol in the total alcohols is 30.19％,and the proportion of C2+alcohols in the total alcohols is 48.08％.