Al3+和Ga3+共掺杂CuZn催化剂催化合成气制低碳醇性能研究OA

With the continuous reduction of fossil fuel reserves,continuous rise of oil prices and increasingly serious environmental problems,people have conducted in-depth research on alternative energy sources.Cu-based catalysts are one of the most important catalysts for the direct conversion of syngas to higher alcohols(C2～C6 alcohols,abbreviated as"C2+alcohols").However,there is a problem ofhigh proportion of methanol and low proportions of ethanol and C2+alcohols.A series of CuZn catalysts with varying n(Al)∶n(Ga)(CuZnAlGa)were synthesized by complete liquid-phase method.Properties such as phase compositions,textural properties and reducibilities were characterized by XRD,N2 adsorption/desorption,H2-TPR,etc.The syngas hydrogenation to C2+alcohols was carried out in a slurry bed reactor,and catalytic performances of CuZnAlGa were analyzed.The results show that the catalyst with n(Al)∶n(Ga)=1∶2 has the highest oxygen vacancy content and shows the best catalytic performance.After reacting for 168 h under the reaction conditions of 553 K,4.0 MPa and n(H2)∶n(CO)=2∶1,the CO conversion rate reaches 11.54％,and the proportions(mole fractions)of ethanol and C2+alcohols in the total alcohol are 71.25％and 86.88％,respectively.