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

Journal article

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.

Authors: Lo, BTW; Lin, W-C; Li, MMJ; Day, S; Tang, C

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Applied Catalysis A: General
• Volume: 596
• Article number: 117528
• Publication date: 2020-03-19
• Acceptance date: 2020-03-15
• DOI: 10.1016/j.apcata.2020.117528
• EISSN: 1873-3875
• ISSN: 0926-860X
• Language: English
• Keywords: surface methoxy surface; synchrotron x-ray powder diffraction; product distribution; methanol conversion; FFR; SAPO-34 zeolite