碱土金属对CuZrO2催化剂上乙醇制备酮类化合物性能的影响

Effect of alkaline earth on the performance of ketones prepared by ethanol over CuZrO2 catalyst

摘要:

分别以碱土金属Mg、Ca、Sr和Ba为助剂改性CuZrO2催化剂，并将其用于催化乙醇一步法制备酮类化合物的反应中。结果表明，以碱土金属Ba改性的Ba-CuZrO2催化剂上Cu电子结合能较高，有利于乙醇分子中O—H键断裂形成乙醛，且该催化剂表面乙醛脱附量最大、中强碱性位（晶格氧）碱性最强，明显促进了缩合反应的进行，酮类产物选择性最高，催化剂性能最佳。另外，碱土金属Ba改性的催化剂具有较好的稳定性。

Abstract:

CuZrO2 catalysts were modified with alkaline earth metals Mg, Ca, Sr and Ba as additives, and used to catalyze the one-step preparation of ketones from ethanol. The results showed that the CuZrO2 catalyst modified with alkaline earth metal Ba had higher Cu electron binding energy on the catalyst, which was favorable to the breakage of O-H bonds in ethanol molecules to form acetaldehyde. Thus, the content of desorbed acetaldehyde was the largest on Ba-CuZrO2 catalyst. In addition, the alkalinity of medium strength alkaline site (lattice oxygen) on Ba-CuZrO2 catalyst surface was the strongest, which had a significant promotion effect on the condensation reaction. The selectivity of ketones on Ba-CuZrO2 Catalyst was the highest and the performance of the catalyst was the best. In addition, Ba-CuZrO2 catalyst had a good stability.