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Elementary steps in the formation of hydrocarbons from surface methoxy groups in HZSM-5 seen by synchrotron infrared microspectroscopy

DOI: 10.1021/acscatal.9b01820 DOI Help

Authors: Ivalina B. Minova (University of St Andrews) , Santhosh K. Matam (UK Catalysis Hub, Research Complex at Harwell; Cardiff University) , Alex Greenaway (UK Catalysis Hub, Research Complex at Harwell) , Richard A. Catlow (UK Catalysis Hub, Research Complex at Harwell; Cardiff University; University College London) , Mark D. Frogley (Diamond Light Source) , Gianfelice Cinque (Diamond Light Source) , Paul A. Wright (University of St Andrews) , Russell F. Howe (University of Aberdeen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Catalysis

State: Published (Approved)
Published: June 2019
Diamond Proposal Number(s): 13725 , 16257 , 20906

Abstract: 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 hydrocar-bon pool that precede aromatic hydrocarbons and lead to indirect alkene formation. This is the first direct observation of these events in real time.

Journal Keywords: synchrotron infrared microspectroscopy; ZSM-5; methanol-to-hydrocarbons; hydrocarbon pool; carboncarbon bond formation

Subject Areas: Chemistry


Instruments: B22-Multimode InfraRed imaging And Microspectroscopy