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 the catalytic cracking of naphtha over ZSM-5 zeolite: Effect of reduced crystal size on the reaction of naphthenes
掲載誌名	正式名：Catalysis Science and Technology ISSNコード：2044-4753/2044-4761
巻・号・頁	4(12),4265-4273頁
著者・共著者	Hiroki Konno,Ryota Ohnaka,Jun Ichi Nishimura,Teruoki Tago,Yuta Nakasaka,Takao Masuda
担当区分	筆頭著者
発行年月	2014/12/01
概要	© 2014 the Partner Organisations. The catalytic cracking of model naphthenes (cyclohexane and methylcyclohexane) over ZSM-5 zeolites of different crystal sizes (macro- and nano-ZSM-5) was examined at reaction temperatures ranging from 748 to 923 K under atmospheric pressure, focusing on the associated reaction rate constants and activation energies. The catalytic cracking was found to follow first-order kinetics with respect to the naphthene concentrations and the activation energies for cyclohexane and methylcyclohexane cracking over nano-ZSM-5 were determined to be 119 and 116 kJ mol-1, respectively. In order to elucidate the rate-limiting step in the cracking process, the Thiele modulus and the effectiveness factor obtained from cracking over the two ZSM-5 zeolites were evaluated. Cracking with nano-ZSM-5 proceeded under reaction-limiting conditions, whereas the reaction over macro-ZSM-5 at 923 K took place under transition conditions between reaction- and diffusion-limiting. Nano-ZSM-5 was applied to the catalytic cracking of a model naphtha and the results demonstrated that this catalyst was both effective and stable and generated a high yield of light olefins.
DOI	10.1039/c4cy00733f
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