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Reactions of Dimethylether in Single Crystals of the Silicoaluminophosphate STA-7 Studied via Operando Synchrotron Infrared Microspectroscopy

DOI: 10.1007/s11244-018-0890-9 DOI Help

Authors: Russell F. Howe (University of Aberdeen) , Suwardiyanto Suwardiyanto (University of Aberdeen) , David J. Price (University of St Andrews) , Maria Castro (University of St Andrews) , Paul A. Wright (University of St Andrews) , Alex Greenaway (University of St Andrews) , Mark D. Frogley (Diamond Light Source) , Gianfelice Cinque (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Topics In Catalysis , VOL 36

State: Published (Approved)
Published: January 2018
Diamond Proposal Number(s): 11766 , 13725

Open Access Open Access

Abstract: Synchrotron infrared micro-spectroscopy has been applied to measure in situ the reaction of dimethylether in single crystals of the silicoaluminophosphate STA-7. The crystals are found to contain a uniform and homogeneous distribution of acidic hydroxyl groups. Dimethylether is hydrogen bonded to the hydroxyl groups at low temperatures, but evidence is found for dissociation to form surface methoxy groups above 473 K, and aromatic hydrocarbon pool species above 573 K. From time resolved infrared measurements coupled with MS analysis of evolved products it is concluded that alkene formation occurs via a direct mechanism from reaction of dimethylether with surface methoxy groups.

Journal Keywords: Infrared microspectroscopy; STA-7; Dimethylether; Hydrocarbon pool

Subject Areas: Chemistry


Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Documents:
10.1007_s11244-018-0890-9.pdf