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Evaluation of Brønsted and Lewis acid sites in H-ZSM-5 and H-USY with or without metal modification using probe molecule-synchrotron X-ray powder diffraction

DOI: 10.1016/j.apcata.2020.117528 DOI Help

Authors: Benedict T. W. Lo (University of Oxford; Hong Kong Polytechnic University) , Wei-che Lin (University of Oxford) , Molly Meng Jung Li (University of Oxford; Hong Kong Polytechnic University) , Sarah Day (Diamond Light Source) , Chiu Tang (Diamond Light Source) , Shik Chi Edman Tsang (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Catalysis A: General , VOL 596

State: Published (Approved)
Published: April 2020

Abstract: The adsorbate interactions of furans as probe molecules in H-ZSM-5 and H-USY with and without metal ion modification have been revealed by synchrotron X-ray powder diffraction (SXRD). The Rietveld refinements give both qualitatively and quantitatively the spatial arrangements and adsorption geometries of furan and 2,5-dimethylfuran (DMF) on the Brønsted acid sites (BAS) and metal Lewis acid sites (LAS). The bonding information between the adsorbate-framework can also be correlated with thermogravimetric findings. The use of probe molecule-SXRD can be used as a new characterisation tool which can spatially interrogate the acidity of crystalline porous catalysts, leading to molecular engineering of new catalytic systems.

Journal Keywords: Methanol conversion; SAPO-34 zeolite; Synchrotron X-ray powder diffraction; Product distribution; Surface methoxy surface

Subject Areas: Chemistry


Instruments: I11-High Resolution Powder Diffraction