コンノ　ヒロキ   Konno Hiroki   今野　大輝    所属   東邦大学  理学部 生命圏環境科学科    職種   准教授
論文種別	原著
言語種別
査読の有無	査読あり
表題	Kinetics of n-hexane cracking over ZSM-5 zeolites - Effect of crystal size on effectiveness factor and catalyst lifetime
掲載誌名	正式名：Chemical Engineering Journal ISSNコード：1385-8947
巻・号・頁	207-208,490-496頁
著者・共著者	Hiroki Konno,Takuya Okamura,Takahito Kawahara,Yuta Nakasaka,Teruoki Tago,Takao Masuda
担当区分	筆頭著者
発行年月	2012/10/01
概要	The catalytic cracking of n-hexane over ZSM-5 zeolite (MFI-type zeolite, Si/Al=150 and 240) catalysts was examined at reaction temperatures ranging from 823 to 923K under atmospheric pressure. The reaction rate constants and activation energies of n-hexane cracking over ZSM-5 zeolites with various crystal sizes and Si/Al ratios were evaluated. The catalytic cracking of n-hexane was first order with respect to the n-hexane concentration, and the activation energies of n-hexane cracking over ZSM-5 zeolites were found to be approximately 123-128kJmol -1. Compared with the macro-sized zeolite, the nano-sized zeolites exhibited high n-hexane conversion with stable activity for 50h. This is because the cracking reaction with nano-sized zeolite proceeded under reaction-limiting conditions, whereas the reaction with macro-sized zeolite proceeded under transition conditions between reaction- and diffusion-limiting conditions. As a result, the application of nano-zeolite to the catalytic cracking of n-hexane was effective and gave light olefins with high yield and excellent stable activity. © 2012 Elsevier B.V.
DOI	10.1016/j.cej.2012.06.157
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