摘要
以碱金属Na、K及碱土金属Mg为助剂改性Cu/ZrO_2催化剂,并将其应用于乙醇一步法合成乙酸乙酯反应中。结果表明,以碱土金属Mg改性的催化剂性能最佳,Mg助剂可以中和催化剂表面一部分中强酸中心,减少副反应发生,进而提高乙酸乙酯的选择性。而Na、K的加入不仅中和了副反应所需的活性中心同时也减少了生成乙酸乙酯所需的活性中心,因此导致乙酸乙酯选择性下降。
The effect of adding alkali metal and alkaline earth metal to the Cu / ZrO2 catalyst for ethanol one-step synthesis ethyl acetate was investigated. The highest promotional effect was observed over the Mg-modified Cu / ZrO2 catalyst. Results revealed that the introduction of Mg could neutralize the medium strength acid sites,and inhibit the occurrence of side reactions,enhance the selectivity of ethyl acetate.However,the addition of Na,K decreased the selectivity of ethyl acetate,which may be due to the strong basicity of Na and K,and reduced esterification center.
出处
《应用化工》
CAS
CSCD
北大核心
2016年第10期1938-1941,共4页
Applied Chemical Industry
