大孔-介孔等级孔Cu基催化剂对丁二烯选择性加氢性能研究OA

The current commercial Pd-based catalysts are expensive,so there is a need to develop alternative low-cost metal catalysts.In this study,hierarchical porous copper-based catalysts were synthesized via selective etching by adjusting alkali concentration,and were characterized using techniques including XRD,SEM,BET,MIP,and N2O chemisorption.The hydrogenation performance of the hierarchical porous Cu-based catalyst was evaluated under conditions of GHSV 30 000 h-1 and V(H2)/V(C3H6)/V(C4H6)/V(He)=137:98:1:196.Results indicate that the Cu-based catalyst possesses a hierarchical pore structure comprising macropores(4～5 μm)and mesopores(2～25 nm).The full conversion temperature of the hierarchical porous Cu-based catalyst is as low as 105 ℃,significantly lower than that of commercial Cu powder(220 ℃),while demonstrating stability exceeding 180 hours.The introduction of the hierarchical pore structure increases the active surface area of the catalyst and enhances the number of Cu active sites.Moreover,retaining an appropriate amount of Al species helps maintain the hierarchical pore structure and improves the resistance of Cu active sites to deactivation.