Effects of Al component contents on performances of CuZnAl catalysts for CO hydrogenation to ethanol and higher alcohols
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％.
Al component contentsCuZnAl catalystscomplete liquid-phase methodethanolhigher alcohols
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