The diffusion of methanol in ZSM-5
The reaction of methanol over a ZSM-5 catalysts to light olefins and gasoline (methanol-to-hydrocarbons, MTH) is a process that is attracting increasing interest, both academically and industrially. Absolutely crucial to the process is the diffusion of methanol into the catalyst. QENS measurements using the backscattering spectrometer OSIRIS at ISIS, show no translational diffusion in the time window. This is consistent with a 1986 measurement by Jobic et al using IN10 that found a translational diffusion constant "“on the order of 10-11 m2 s-1 at 300 K". This measurement was at the limit of IN10, thus an instrument with better resolution so that it can access slower motions is required. This appears ideally suited to spin echo spectroscopy on WASP. We propose to measure the translational diffusion of methanol in an industrial ZSM-5 sample in the empty state and after adsorption of methanol. Three temperatures will be measured to obtain both the diffusion constants and the activation energy. This pilot study will use fresh ZSM-5; if this is successful, then future work will use steam dealuminated ZSM-5, which is more representative of the catalyst as used industrially.
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PARKER Stewart F; FOUQUET Peter and LENNON David. (2021). The diffusion of methanol in ZSM-5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-530
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