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Volume 188, 2016
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Modelling metal centres, acid sites and reaction mechanisms in microporous catalysts

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Abstract

We discuss the role of QM/MM (embedded cluster) computational techniques in catalytic science, in particular their application to microporous catalysis. We describe the methodologies employed and illustrate their utility by briefly summarising work on metal centres in zeolites. We then report a detailed investigation into the behaviour of methanol at acidic sites in zeolites H-ZSM-5 and H-Y in the context of the methanol-to-hydrocarbons/olefins process. Studying key initial steps of the reaction (the adsorption and subsequent methoxylation), we probe the effect of framework topology and Brønsted acid site location on the energetics of these initial processes. We find that although methoxylation is endothermic with respect to the adsorbed system (by 17–56 kJ mol−1 depending on the location), there are intriguing correlations between the adsorption/reaction energies and the geometries of the adsorbed species, of particular significance being the coordination of methyl hydrogens. These observations emphasise the importance of adsorbate coordination with the framework in zeolite catalysed conversions, and how this may vary with framework topology and site location, particularly suited to investigation by QM/MM techniques.

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Publication details

The article was received on 01 Feb 2016, accepted on 03 Feb 2016 and first published on 03 Feb 2016


Article type: Paper
DOI: 10.1039/C6FD00010J
Citation: Faraday Discuss., 2016,188, 235-255
  • Open access: Creative Commons BY license
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    Modelling metal centres, acid sites and reaction mechanisms in microporous catalysts

    A. J. O'Malley, A. J. Logsdail, A. A. Sokol and C. R. A. Catlow, Faraday Discuss., 2016, 188, 235
    DOI: 10.1039/C6FD00010J

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