Abstract
AbstractThe nature of the hydrocarbon pool at different stages of the methanol‐to‐hydrocarbons reaction over ZSM‐5 is examined. A combination of reaction testing, analytical and spectroscopic techniques is employed to investigate changes in the nature and form of the hydrocarbon pool as a function of reaction conditions and reaction time. It is shown that inelastic neutron scattering spectroscopy (INS) complements other spectroscopic methods for observing molecular components in the hydrocarbon pool of working catalysts. INS is uniquely able to spectroscopically identify the form of coke species present in deactivated catalysts.
Highlights
The methanol-to-hydrocarbons (MTH) reaction over an acidic zeolite catalyst such as ZSM-5 is an important class of reaction to produce olefins and methylated aromatics, with the reaction thought to proceed by a ‘hydrocarbon pool’ (HCP) mechanism
inelastic neutron scattering spectroscopy (INS) spectroscopy has been used as the principal probe to interrogate the ZSM-5/MTH reaction system, with an emphasis on the form of the hydrocarbon pool
The following conclusions have been drawn. * At short reaction times the INS spectra indicate a mixture of hydrocarbons to be present but with no singular molecular entity dominant (Figure S6). * The INS spectra for longer run samples recorded at 300 and 350 °C exhibit the same spectral pattern as previously reported (Figure 4) and may be characterised as the vibrational fingerprint of the working hydrocarbon pool (HCP)
Summary
The methanol-to-hydrocarbons (MTH) reaction over an acidic zeolite catalyst such as ZSM-5 is an important class of reaction to produce olefins and methylated aromatics, with the reaction thought to proceed by a ‘hydrocarbon pool’ (HCP) mechanism. UV-VIS spectroscopy has been used extensively to identify individual components of the HCP, but interpretation of the broad overlapping bands can be problematical, at longer reaction times.[14,18,19,20,21,22,23,24,25,26,27] NMR spectroscopy is highly successful at providing insight in the initial and steady state stages. There is a gap in literature pertaining to the study of large-scale samples, and how the change in sample size could affect the MTH reaction
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