Avoiding Self-Poisoning: A Key Feature for the High Activity of Au/Mg(OH)2 
Catalysts in Continuous Low-Temperature CO Oxidation

Wang, Yuchen; Widmann, Daniel; Lehnert, Felix; Gu, Dong; Schüth, Ferdi; Behm, R. Jürgen

doi:10.1002/anie.201702178

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Avoiding Self-Poisoning: A Key Feature for the High Activity of Au/Mg(OH)₂ Catalysts in Continuous Low-Temperature CO Oxidation

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Gu, Dong
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth, Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Wang, Y., Widmann, D., Lehnert, F., Gu, D., Schüth, F., & Behm, R. J. (2017). Avoiding Self-Poisoning: A Key Feature for the High Activity of Au/Mg(OH)₂ Catalysts in Continuous Low-Temperature CO Oxidation. Angewandte Chemie International Edition, 56(32), 9597-9602. doi:10.1002/anie.201702178.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-18EF-1

Abstract

Au/Mg(OH)₂ catalysts have been reported to be far more active in the catalytic low-temperature CO oxidation (below 0 °C) than the thoroughly investigated Au/TiO₂ catalysts. Based on kinetic and in situ infrared spectroscopy (DRIFTS) measurements, we demonstrate that the comparatively weak interaction of Au/Mg(OH)₂ with CO₂ formed during the low-temperature reaction is the main reason for the superior catalyst performance. This feature enables rapid product desorption and hence continuous CO oxidation at temperatures well below 0 °C. At these temperatures, Au/TiO₂ also catalyzes CO₂ formation, but does not allow for CO₂ desorption, which results in self-poisoning. At higher temperatures (above 0 °C), however, CO₂ formation is rate-limiting, which results in a much higher activity for Au/TiO₂ under these reaction conditions.