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Kinetics of n-hexane cracking over ZSM-5 zeolites : Effect of crystal size on effectiveness factor and catalyst lifetime

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Title: Kinetics of n-hexane cracking over ZSM-5 zeolites : Effect of crystal size on effectiveness factor and catalyst lifetime
Authors: Konno, Hiroki Browse this author
Okamura, Takuya Browse this author
Kawahara, Takahito Browse this author
Nakasaka, Yuta Browse this author →KAKEN DB
Tago, Teruoki Browse this author →KAKEN DB
Masuda, Takao Browse this author →KAKEN DB
Keywords: Nano-zeolite
ZSM-5
Naphtha
Catalytic cracking
Kinetic
Thiele modulus
Issue Date: 1-Oct-2012
Publisher: Elsevier B.V.
Journal Title: Chemical Engineering Journal
Volume: 207-208
Start Page: 490
End Page: 496
Publisher DOI: 10.1016/j.cej.2012.06.157
Abstract: 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 923 K 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 123-128 kJ mol^[-1]. Compared with the macro-sized zeolite, the nano-sized zeolites exhibited high n-hexane conversion with stable activity for 50 h. 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/51051
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 多湖 輝興

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