Matam, S.K. et al. (2018) The effects of MTG catalysis on methanol mobility in ZSM-5. Catalysis Science and Technology, 8(13), pp. 3304-3312. (doi: 10.1039/C8CY00422F)
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Abstract
We analyse the dynamics of methanol in ZSM-5 catalysts both with and without the hydrocarbon pool, resulting from the methanol to gasoline (MTG) reaction taking place at 623 K and 673 K for three days, to determine the effects of catalyst use on molecular mobility. Using quasielastic neutron scattering (QENS), we observe that methanol is immobile on the QENS instrumental time scale in the fresh catalyst (ZSM-5-F) and in the sample used to convert methanol for 3 days at 623 K (ZSM-5-623). However, in zeolite ZSM-5-673 (MTG at 673 K for 3 days) we observe isotropic methanol rotation with an immobile fraction of 0.58 and a rotational diffusion coefficient of DR = 3 × 1010 s−1. The observed differences between the zeolites in methanol dynamics are attributed to the development of mesoporosity in ZSM-5-673 due to the high reaction temperature of 673 K, leading to dislodgement of lattice Al as is evident from NMR data.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Zachariou, Miss Andrea and Lennon, Professor David and Hawkins, Alexander |
| Authors: | Matam, S.K., O'Malley, A.J., Catlow, C.R.A., Suwardiyanto, , Collier, P., Hawkins, A., Zachariou, A., Lennon, D., Silverwood, I., Parker, S.F., and Howe, R.F. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Catalysis Science and Technology |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 2044-4753 |
| ISSN (Online): | 2044-4761 |
| Published Online: | 12 June 2018 |
| Copyright Holders: | Copyright © 2018 The Royal Society of Chemistry |
| First Published: | First published in Catalysis Science and Technology 8(13):3304-3312 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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