Key role of the pore volume of zeolite for selective production of propylene from olefins.
Key role of the pore volume of zeolite for selective production of propylene from olefins.
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DOI：
10.1039/b921927g
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
To-ru Koyama;Y. Hayashi;Hironori Horie;S. Kawauchi;A. Matsumoto;Y. Iwase;Y. Sakamoto;A. Miyaji
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文献类型：
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作者：
To-ru Koyama;Y. Hayashi;Hironori Horie;S. Kawauchi;A. Matsumoto;Y. Iwase;Y. Sakamoto;A. Miyaji
根据流出的碳氢化合物和 SAPO-34 孔隙中产生的碳氢化合物的量，研究了从乙烯 (C(2)H(4)) 生产丙烯 (C(3)H(6)) 的合理反应机理。丙烯是通过低聚裂解机制生产的。在此机理的基础上，考察了C(2)H(4)、戊烯和己烯的转化。通过比较催化性能，研究8元、10元和12元环沸石的孔容在选择性生产C(3)H(6)中的作用。 C(3)H(6) 的选择性主要取决于沸石的孔体积。从烯烃（C(2)H(4)、戊烯和己烯）高选择性生产 C(3)H(6) 可以通过采用新概念来实现：与传统分子筛方法相反，调整沸石的孔体积以适应烯烃和/或其碳正离子的体积。例如，涉及初级阳离子的戊烯单分子裂解成C(3)H(6)和C(2)H(4)可以通过沸石的孔体积来控制。
A plausible reaction mechanism for propylene (C(3)H(6)) production from ethylene (C(2)H(4)) was investigated, based on the amounts of effluent hydrocarbons and hydrocarbons produced in the pores of SAPO-34. Propylene was produced via an oligomerization-cracking mechanism. On the basis of this mechanism, the conversions of C(2)H(4), pentenes, and hexenes were examined. The catalytic performance was compared, in order to investigate the role of the pore volume of zeolites with 8-, 10-, and 12-membered rings in the selective production of C(3)H(6). The selectivity for C(3)H(6) was crucially dependent upon the pore volume of the zeolite. Highly selective production of C(3)H(6) from olefins (C(2)H(4), pentenes, and hexenes) can be accomplished by employing a new concept: adjusting the pore volume of a zeolite to accommodate the volume of an olefin and/or its carbenium cations, as opposed to a conventional molecular sieve approach. For example, an unimolecular cracking of pentenes into C(3)H(6) and C(2)H(4) involving primary cations can be controlled by the pore volume of a zeolite.