Synchrotron infrared microspectroscopy has identified with high temporal resolution (down to 0.25 s) the initial events occurring when methanol vapour is contacted with a crystal of zeolite HZSM-5. The first alkenes are generated directly from methoxy groups formed at the acid sites via their deprotonation. These alkenes can either desorb directly or oligomerise and cyclise to form dimethylcyclopentenyl cations. The oligomeric and dimethylcyclopentenyl cations are the first major components of the hydrocarbon pool that precede aromatic hydrocarbons and lead to indirect alkene formation. The technique observes these events in real time.
- synchrotron infrared microspectroscopy
- hydrocarbon pool
- carbon-carbon bond formation
ASJC Scopus subject areas
Minova, I. B., Matam, S. K., Greenaway, A., Catlow, C. R. A., Frogley, M. D., Cinque, G., ... Howe, R. F. (2019). Elementary Steps in the Formation of Hydrocarbons from Surface Methoxy Groups in HZSM-5 seen by Synchrotron Infrared Microspectroscopy. ACS Catalysis, 9(7), 6564-6570. https://doi.org/10.1021/acscatal.9b01820