Synchrotron infrared micro-spectroscopy of zeolite catalysts

Russell F. Howe*, Paul A. Wright, Ivalina Tuxworth, Mark D. Frogley, Gianfelice Cinque

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This article reviews recent work undertaken at the beamline B22 of the Diamond Light Source using infrared micro-spectroscopy to characterise zeolite catalysts and to study their reactivity in real time. The advantage of vibrational micro- spectroscopic analysis when linked to the brightness and spectral band-width of synchrotron infrared light are illustrated. The high spatial resolution means that the uniformity of acid site concentrations within individual large crystals of zeolites and between different crystals can be readily checked, and changes to acid site concentrations within crystals resulting from steam treatment mapped. When an in-situ reaction cell is coupled with mass spectrometric analysis of evolved gases the rapid time response of the method has provided new insight into the initial stages of the conversion of methanol to hydrocarbons over ZSM-5 and SAPO-34 single crystals. Future prospects for applying the method to other types of zeolite catalysed reactions with improved reaction cell design are also discussed.
Original languageEnglish
JournalJohnson Matthey Technology Review
VolumeIn press
Early online date10 Jan 2024
DOIs
Publication statusE-pub ahead of print - 10 Jan 2024

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