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Kinetics of the catalytic cracking of naphtha over ZSM-5 zeolite: effect of reduced crystal size on the reaction of naphthenes

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Title: Kinetics of the catalytic cracking of naphtha over ZSM-5 zeolite: effect of reduced crystal size on the reaction of naphthenes
Authors: Konno, Hiroki Browse this author
Ohnaka, Ryota Browse this author
Nishimura, Jun-ichi Browse this author
Tago, Teruoki Browse this author →KAKEN DB
Nakasaka, Yuta Browse this author →KAKEN DB
Masuda, Takao Browse this author →KAKEN DB
Keywords: Effectiveness factor
Thiele modulus
Mass transfer
Catalytic cracking
Naphtha
Naphthene
Issue Date: 1-Dec-2014
Publisher: Royal Society of Chemistry
Journal Title: Catalysis science & technology
Volume: 4
Issue: 12
Start Page: 4265
End Page: 4273
Publisher DOI: 10.1039/c4cy00733f
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/59518
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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