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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
| 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)
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Submitter: 多湖 輝興
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