The effects of MTG catalysis on methanol mobility in ZSM-5

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zachariou, 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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
557001Catalytic Science in the Harwell Research CentreDavid LennonEngineering and Physical Sciences Research Council (EPSRC)EP/I019693/1CHEM - CHEMISTRY
654181Catalytic HDO (UK Catalysis hub)Samuel JacksonEngineering and Physical Sciences Research Council (EPSRC)EP/K014706/1CHEM - CHEMISTRY
652891Towards closing the chlorine cycle in large-scale chemical manufacturing processes (UK Catalysis hub)David LennonEngineering and Physical Sciences Research Council (EPSRC)EP/K014854/1CHEM - CHEMISTRY