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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 inactivation rules of NKC-03A catalyst for the dehydration of ethanol to ethylene were studied by means of TPD, IR, SEM, BET, ESR, MR and elemental analysis of CH 3. The fresh catalyst surface had B, B + L and L Acid Center. After about 200 hours of reaction, the B acid disappeared and a new absorption peak appeared at the wavenumber of 1385cm -1, indicating that ethylene, the product of ethanol dehydration, could easily polymerize on the Bronic acid center. 1385cm ~ (-1) peak and the polymer. The main active site of the dehydration reaction is the moderate-intensity B acid. During the alcohol dehydration, the L acid can be converted to B acid. The stability of the catalyst is directly related to the B acid content, therefore, controlling the B acid content on the catalyst surface plays an important role in improving the catalyst stability.