Hawkins, A. P. , Zachariou, A., Parker, S. F., Collier, P., Silverwood, I. P., Howe, R. F. and Lennon, D. (2020) Onset of propene oligomerization reactivity in ZSM-5 studied by inelastic neutron scattering spectroscopy. ACS Omega, 5(14), pp. 7762-7770. (doi: 10.1021/acsomega.9b03503) (PMCID:PMC7160849)
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Abstract
The techniques of quasi-elastic and inelastic neutron scattering (QENS and INS) are applied to investigate the oligomerization of propene over a ZSM-5 zeolite. Investigations are performed at low temperatures, allowing identification of the onset of the oligomerization reaction and observation of the low-energy spectral changes due to intermediate formation that are difficult to observe by optical methods. Oligomerization proceeds via formation of a hydrogen-bonded precursor by an interaction of the propene with an internal acid site followed by protonation and chain growth with protonation being the rate-limiting step. The use of quasi-elastic neutron scattering to observe changes in system mobility with temperature via the elastic window scan technique allows identification of the active temperature range where catalyst activity commences and permits targeting of the more time-consuming INS investigations to conditions of interest. From examination of the product’s spectrum, the structure of the resulting oligomer is deduced to be primarily linear.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Zachariou, Miss Andrea and Lennon, Professor David and Hawkins, Alexander |
| Authors: | Hawkins, A. P., Zachariou, A., Parker, S. F., Collier, P., Silverwood, I. P., Howe, R. F., and Lennon, D. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | ACS Omega |
| Publisher: | American Chemical Society |
| ISSN: | 2470-1343 |
| ISSN (Online): | 2470-1343 |
| Published Online: | 30 March 2020 |
| Copyright Holders: | Copyright © 2020 American Chemical Society |
| First Published: | First published in 5(14):7762-7770 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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