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Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction	Thermal alteration in adsorption sites over SAPO-34 zeolite Guangchao Li , Tatchamapan Yoskamtorn , Wei Chen , Christopher Foo , Jianwei Zheng , Chiu Tang , Sarah Day , Anmin Zheng , Molly Meng-Jung Li , Edman Shik Chi Tsang Angewandte Chemie International Edition DOI: 10.1002/anie.202204500 Open Access Show Abstract ▼ Abstract: Zeolites have found tremendous applications in the chemical industry. However, it is unclear about the dynamic nature of their active sites under the flow of adsorbate molecules for adsorption and catalysis, especially in operando conditions, which could be different from the as-synthesized structures. In the present study, we report a structural transformation of the adsorptive active sites in SAPO-34 zeolite by using acetone as a probe molecule under various temperatures. The combination of solid-state nuclear magnetic resonance, in-situ variable-temperature synchrotron x-ray diffraction, and in-situ diffuse-reflectance infrared Fourier-transform spectroscopy allow a clear identification and quantification that the chemisorption of acetone can convert the classical Brønsted acid site adsorption mode to an induced Frustrated Lewis Pairs adsorption mode at increasing temperatures. Such facile conversion is also supported by the calculations of ab-initio molecular-dynamics simulations. This work sheds new light on the importance of the dynamic structural alteration of active sites in zeolites with adsorbates at elevated temperatures.	Apr 2022

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I11-High Resolution Powder Diffraction

Thermal alteration in adsorption sites over SAPO-34 zeolite

Guangchao Li , Tatchamapan Yoskamtorn , Wei Chen , Christopher Foo , Jianwei Zheng , Chiu Tang , Sarah Day , Anmin Zheng , Molly Meng-Jung Li , Edman Shik Chi Tsang

Angewandte Chemie International Edition

DOI: 10.1002/anie.202204500