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通过离子改性、水热处理、表面毒化及预积炭等方法均可提高ZSM-5沸石的择形催化性能.上述方法在改变沸石孔道结构时也明显地改变了沸石的表面酸性质.近年来,采用化学修饰的方法对沸石表面和孔口进行调变的研究已有一些报导.杨儒等用硅烷或SiCl_4等进行气相硅烷化,除缩小孔口尺寸外,还产生了骨架脱铝补硅作用,导致表面酸性质发生变化.王清遐等用正硅酸乙醇浸渍(ZSM-5沸石,随着硅的载入量增加,催化剂酸量和反应活性均降低,而对位选择性增加.Murakami用正硅酸甲
The selective catalytic activity of ZSM-5 zeolite can be improved by ion modification, hydrothermal treatment, surface poisoning and pre-carbon deposition, etc. These methods obviously change the surface acidity of zeolite when the pore structure of zeolite is changed. , The use of chemical modification of the zeolite surface and the orifice of the modulation has been reported in some reports.Yang Ru et al silane or SiCl_4 and other gas-phase silanization, in addition to reducing the size of the orifice, but also produced a framework of aluminum off silicon , Resulting in changes in the surface acid properties Wang Qingxia et al impregnated with orthosilicate ethanol (ZSM-5 zeolite, with the silicon loading increases, the amount of the catalyst acid and reactivity are reduced, and the para-selectivity increases. Murakami Is a silicic acid