International Tables for Crystallography

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Quick EXAFS studies in catalysis
M. Nachtegaal and R. Frahm. International Tables for Crystallography (2022). Vol. I [ doi:10.1107/S1574870720004826 ]

Abstract

QEXAFS (quick extended X-ray absorption fine structure), or alternatively quick EXAFS, spectroscopy refers to X-ray absorption measurements with a time resolution of a few seconds down to several milliseconds. This is achieved by the fast continuous scanning of a double-crystal monochromator through the Bragg angle and thus a certain energy range. This chapter describes selected applications of state-of-the-art QEXAFS. QEXAFS spectroscopy allows study of the rate of structural change and reaction mechanisms in dynamic systems such as catalysts or during the synthesis of materials. This is illustrated by three examples: identifying the rate-limiting step in the low-temperature reduction of harmful nitrous oxides (as found in diesel-fueled cars) over a copper zeolite, understanding the deactivation mechanism of a nickel-based CO2-methanation catalyst due to intermittent cutoff of renewable hydrogen in the feed, and finally following the growth mechanism and kinetics of iron–organic nanoaggregates under different environmental conditions.


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About International Tables for Crystallography

International Tables for Crystallography is the definitive resource and reference work for crystallography. The multi-volume series comprises articles and tables of data relevant to crystallographic research and to applications of crystallographic methods in all sciences concerned with the structure and properties of materials.