表面修饰对金属负载型MZSM-5催化剂乙烯齐聚性能的影响

在较温和的中压条件下，研究了金属负载型MZSM-5分子筛经表面修饰制备的MZSM-5L催化剂的乙烯齐聚反应，并对各催化剂进行了表征．结果表明，MZSM-5L催化剂经有机碱表面修饰后，催化剂表面酸性降低，孔分布向有利于择形生成线性分子的小孔方向移动，催化乙烯齐聚反应活性适中、稳定性较好，反应产物以C10～C16烯烃为主，α-烯烃选择性大幅提高．择形生成α-烯烃的催化活性中心的强弱是由催化剂内表面的B酸位和L酸中心所决定的．

Influence of Surface-Modified on Ethylene Oligomerization Performance of Metal-Loaded MZSM-5 Catalysts

The reactions of ethylene oligomerization on the MZSM-5L catalysts obtained from the catalyst of MZSM-5 by surface modified, were studied under moderate pressure and the MZSM-5L catalysts were characterized. The results showed that the catalysts had suitable activities, higher stabilities and better selectivities of alpha olefins. The main products were C_(10)~C_(16) olefins. The surface acid sites of MZSM-5L decreased and the percentage of small pores forming linear molecule increased in their effective pore distributions after the surface of catalysts were modified by organic base. IR results exhibited that B and L acid sites on the inside surface of the catalysts decided activities of the catalysts.