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, Shik Chi Edman Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Zeolites have found tremendous applications in the chemical industry. However, the dynamic nature of their active sites under the flow of adsorbate molecules for adsorption and catalysis is unclear, 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.

Original languageEnglish
Article numbere202204500
JournalAngewandte Chemie - International Edition
Volume61
Issue number27
DOIs
Publication statusPublished - 4 Jul 2022

Keywords

  • Active Sites
  • Frustrated Lewis Pair
  • Solid-State Nuclear Magnetic Resonance
  • Synchrotron X-Ray Diffraction
  • Zeolites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Fingerprint

Dive into the research topics of 'Thermal Alteration in Adsorption Sites over SAPO-34 Zeolite'. Together they form a unique fingerprint.

Cite this