关键词: 1, 4-丁二醇, 吡咯, Cu/ZnO催化剂, 共沉淀法

Abstract: Cu/ZnO catalysts were prepared by the co-precipitation method for synthesis of pyrrole from 1,4-butanediol and were characterized by XRD, TPR and N2O adsorption-decomposition techniques to analyze the roles of Cu0 and ZnO. The product was identified by GC-MC, IR. The study suggested that Cu0 was the active site and ZnO played a role of dispersing and stablizing copper particles. It was due to the formation of two kinds of precursors CuZn(OH)2CO3 and (CuZn)5(OH)6(CO3)2 during the catalyst preparation process. Although Cu0 is the active site, the catalytic activity of Cu/ZnO catalyst was not linear with Cu0 surface area. The result indicated that the synthesis of pyrrole could be a structure-sensitive reaction over Cu/ZnO catalysts. When the molar ratio of Cu/Zn was 1∶1, the suitable reaction conditions were determined as follows: atmospheric pressure, reaction temperature of 280 ℃, 1,4-butanol weight space velocity of 0.46 h?1 and molar ratio of ammonia to 1,4-butanol of 1.1∶1. Conversion of 1,4-butanediol was100% and selectivity of pyrrole was 58% under such conditions.

Key words: 1,4-butanediol, pyrrole, Cu/ZnO catalyst, co-precipitation method