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