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Title: 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
Authors: Lo, BTW 
Lin, WC
Li, MMJ 
Day, S
Tang, C
Tsang, SCE
Issue Date: 25-Apr-2020
Source: Applied catalysis. A, General, 25 Apr. 2020, v. 596, 117528
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.
Keywords: Methanol conversion
Product distribution
SAPO-34 zeolite
Surface methoxy surface
Synchrotron X-ray powder diffraction
Publisher: Elsevier
Journal: Applied catalysis. A, General 
EISSN: 0926-860X
DOI: 10.1016/j.apcata.2020.117528
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