【摘 要】
：
A series of triphenylethoxysilane (TPEOS)-modified nanosheet HZSM-5 catalysts (ZN-x,x =4％,8％ and 16％,mass) were synthesized by chemical liquid deposition to selectively change external acidity distri-butions.TPEOS modification was found to passivate some
【机 构】
：
Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering
论文部分内容阅读
A series of triphenylethoxysilane (TPEOS)-modified nanosheet HZSM-5 catalysts (ZN-x,x =4％,8％ and 16％,mass) were synthesized by chemical liquid deposition to selectively change external acidity distri-butions.TPEOS modification was found to passivate some external Brφnsted and Lewis acid sites by 37.8％,in which Brφnsted acid sites (BAS) were found more easily sacrificed by breaking the surface Al-O bond of bridging hydroxyl groups and forming Si-O-Si bonds.The selectivity of ZN-8 catalyst for light olefins (ethylene,propylene and butene) in n-decane catalytic cracking is up to 26％ (450 ℃,WHSV =10.95 h-1),which is ca.78％ higher than that of parent one.The better performance was attrib-uted to the appropriate external acid density in ZN-8,which inhibits bimolecular hydrogen transfer reac-tion of light olefins on the adjacent acid sites,resulting in more olefins,few coke precursors and thus an excellent catalytic stability.
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