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Elucidation of Adsorbate Structures and Interactions on Brønsted Acid Sites in H-ZSM-5 by Synchrotron X-ray Powder Diffraction

DOI: 10.1002/anie.201600487 DOI Help

Authors: Benedict T. W. Lo (University of Oxford) , Lin Ye (University of Oxford) , Jin Qu (University of Oxford) , Junliang Sun (Peking University) , Junlin Zheng (SRIPT-SINOPEC) , Dejing Kong (SRIPT-SINOPEC) , Claire A Murray (Diamond Light Source) , Chiu C Tang (Diamond Light Source) , Edman Tsang (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition

State: Published (Approved)
Published: March 2016

Abstract: Microporous H-ZSM-5 containing one Brønsted acid site per asymmetric unit is deliberately chosen to host pyridine, methanol, and ammonia as guest molecules. By using new-generation in situ synchrotron X-ray powder diffraction combined with Rietveld refinement, the slight but significant alteration in scattering parameters of framework atoms modified by the guest molecules enables the user to elucidate their adsorption geometries and interactions with the Brønsted acid sites in H-ZSM-5 in terms of atomic distances and angles within experimental errors. The conclusion, although demonstrated in the H-ZSM-5, is expected to be transferable to other zeolites. This approach provides a stepping stone towards the rational engineering of molecular interaction(s) with acid sites in zeolitic catalysis.

Journal Keywords: Brønsted acid sites;catalysis;powder X-ray diffraction;Rietveld refinement;zeolites

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction