M/V-Al-2O_3型催化剂的制备、表征及催化性能研究  

Preparation,characterization of M/υ-Al_2O_3 catalyst and its catalytic performance studies

作　　者：陈波[1] 李明时[1] 鲁墨弘[1] 朱建军[1] 单玉华[1] 

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化学研究与应用》2012年第10期1505-1509,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(20976076)资助

摘　　要：采用等体积浸渍法制备了M/γ-Al2O3系列催化剂,M为NaOH、KOH、MgO,通过XRD、BET等测试技术对催化剂进行了表征,并将催化剂应用于二乙醇胺催化脱水制备吗啉反应中,实验考察了修饰剂及负载量、反应温度、压力等对催化剂活性的影响。结果表明,NaOH/γ-Al2O3、KOH/γ-Al2O3、MgO/γ-Al2O3催化剂具有高的催化活性及对吗啉制备的高选择性,其原因是此反应需要中强酸及弱酸中心,强酸中心易使催化剂表面积炭,经过NaOH、KOH、Mg(OH)2修饰的γ-Al2O3其强酸中心减少而中强酸和弱酸中心相应增加,从而提高了催化剂的活性、选择性和稳定性。A series of γ-Al2O3 catalysts modified by alkali （ NaOH, KOH, Mg（OH） 2 ） were prepared by incipient impregnation meth- od,and characterized by XRD and BET. Their catalytic performances were investigated in the dehydration of diethanolamine to mor- pholine. The influences of modifier, modifier content, reaction temperature and pressure were investigated. It was shown that alkali/ γ-Al2O3 catalyst exhibits high catalytic activity and selectivity to morpholine. The intermediate strength acid sites and weak acid sites are favorable for the reaction, while the stronger acid sites may cause catalyst deactivation due to carbon deposition. Adding alkali to γ-Al2O3 may decrease the number of stronger acid sites and increase the number of intermediate strength and weak acid sites. Therefore,the γ-Al2O3 modified by alkali can improve its catalytic activity, selectivity, and stability for the dehydration of di- ethanolamine to morpholine.

关 键 词：吗啉 二乙醇胺 Γ-AL2O3 催化脱水 

分 类 号：O643.3[理学—物理化学]