n(Zn)/n(Al)对ZnAl催化剂结构及催化合成气制乙醇性能的影响OA

The catalytic conversion of coal-based syngas to ethanol is one of the important pathways for the clean and efficient utilization of coal.ZnAl catalysts prepared using complete liquid-phase method can be employed for the direct catalysis of CO hydrogenation to produce ethanol.A series of ZnAl catalysts with different n(Zn)/n(Al)were prepared via the complete liquid-phase method,and their catalytic performances in syngas to ethanol were evaluated in a slurry bed reactor.The structures of the catalysts before and after reactions were characterized using XRD,N2 adsorption/desorption,FT-IR,NH3-TPD-MS and XPS.The results show that under the conditions of total syngas flow rate of 150 mL/min,V(H2):V(CO)of 2:1,temperature of 280 ℃ and pressure of 4.0 MPa,the catalyst with n(Zn)/n(Al)of 1.0 exhibits relatively optimal catalytic performance over 48 h to 168 h,maintaining total alcohol selectivity of approximately 23％,with the proportion of ethanol in total alcohol(mole fraction)consistently above 60％.The aluminum component content significantly influences the textural property and surface acidity of the catalyst,and adjusting n(Zn)/n(Al)can modulate the surface Zn(2-δ)+(0<δ<2)content of the catalyst,thereby affecting total alcohol selectivity.