雷尼铜催化剂的制备及用于醋酸酯加氢反应的研究  

Synthesis and Application of Raney Copper Catalysts

作　　者：吴佳佳 鲁树亮[1] 田保亮[1] Wu Jiajia;Lu Shuliang;Tian Baoliang(Beijing Research Institute of Chemical Industry,Beijing100013,China)

机构地区：[1]中国石油化工股份有限公司北京化工研究院

出　　处：《广东化工》2019年第11期46-49,26,共5页Guangdong Chemical Industry

摘　　要：本文采用高温热熔融法制备出不同成分以及不同金属元素掺杂的Cu-Al合金前驱体,在氢氧化钠溶液中活化后制备出多孔雷尼铜催化剂,分析不同的合金成分对Cu-Al合金在氢氧化钠溶液中活化的过程和纳米多孔铜的形成、结构及形貌的影响并研究了其作为催化剂对醋酸酯加氢反应的影响。对雷尼铜催化剂进行了一系列的物理化学表征发现,催化剂为多孔结构并分析不同的合金成分对Cu-Al合金在氢氧化钠溶液中活化的过程和纳米多孔铜的形成、结构及形貌的影响并研究了其作为催化剂对醋酸酯加氢反应的影响。在醋酸酯加氢反应中,在相同的反应条件下(反应温度为250℃,反应压力为3.0Mpa,摩尔氢酯比为37,醋酸酯的液体空速为0.25h-1),Al原子比例为67%时催化剂具有很高的加氢活性,而Al原子比例为50%时催化剂则不具备有加氢活性。This article introduces a series of Cu-Al alloys which synthesized by the high temperature annealing method.Putting the Cu-Al alloys into NaOH solution will release hydrogen and obtain the Raney copper catalysts.This paper analyzes the reactions of different alloy composition of Cu-Al alloy in the NaOH solutions and the formation of nanoporous copper,the structures and morphology of influence.A series of physical and chemical characterization carried on the Raney catalyst found that the catalyst have loose-like structure,with extensive channels and secondary channels.The high temperature sintering didn’t cause metal particles sintered.The catalyst performance in the hydrogenation reaction was evaluated.Research shows that the CuAl2 based copper alloy phase which has catalytic activity of alloy phase.The Raney copper catalyst which obtained by CuAl2 alloy exhibited high activity and selectivity of the ethanol acetate hydrogenation reaction,but its stability is poor block Raney copper catalyst,deactivation speed.But the stability of Raney copper catalyst is poor,leading to its activity decreased quickly.Under the optimal reaction conditions of temperature 250℃,pressure 3.0 MPa,n(H2)∶n(ethyl acetate)37 and LHSV 0.25h^-1,the catalyst which synthesized by CuAl2 alloy have high activity while the catalyst synthesized by CuAl alloy have no activity in the ethanol acetate hydrogenation reaction.

关 键 词：催化加氢 雷尼催化剂 醋酸酯加氢 

分 类 号：TQ4126.8[化学工程]