NKC-03A乙醇脱水制乙烯催化剂的活性位和失活规律的研究  

ACTIVE SITES AND DEACTlVATION OF NKC-03A CATALYST FOR ETHANOL DEHYDRATION TO ETHYLENE

作　　者：潘履让[1] 贾春娟[1] 李赫晅 

机构地区：[1]南开大学化学系

出　　处：《Chinese Journal of Catalysis》1989年第4期372-377,共6页催化学报（英文）

摘　　要：用TPD,IR,SEM,BET,ESR,MR和碳氢元素分析方法,研究了NKC-03A催化剂对乙醇脱水制乙烯反应的活性位和失活规律.新鲜催化剂表面存在B,B+L和L酸中心。反应约200小时后B酸消失,与此同时在波数为1385cm^(-1)处出现一个新的吸收峰,说明乙醇脱水的产物乙烯易在B酸中心上聚合。1385cm^(-1)峰与聚合物有关。脱水反应的主要活性位是中等强度的B酸。在醇脱水过程中,L酸可向B酸转化。催化剂的稳定性与B酸含量直接相关,因此,控制催化剂表面B酸含量对提高催化剂稳定性有着重要作用。The active sites and deactivation of NKC-03A catalyst for ethanol dehydration to ethylene have been studied by means of TPD, IR, SEM, ESR and BET methods. It is found that there are B, B+L, and L acid on the surface of fresh catalyst. After reaction for 200 h, B acid sites disappear and a new IR peak appears at wavenumber 1385 cm-1, indicating that the ethylene which formed during ethanol dehydration is polymerized on the B acid sites, and the 1385 cm-1 peak is related to polymers. The B acid of medium acidic strength is the main active sites for dehydration. During ethanol dehydration, L acid may change into B acid. The stability of the catalyst is directly related to B acid content. Therefore, it is of great importance to control the surface B acidcontent of the catalyst for increasing the catalyst stability.

关 键 词：乙醇 脱水 乙烯 NKC-03A 催化剂 

分 类 号：TQ221.211[化学工程—有机化工]