Raising the CO x Methanation Activity of a Ru/γ-Al 2 O 3 Catalyst by Activated Modification of Metal-Support Interactions

Ru/Al O is a highly stable, but less active catalyst for methanation reactions. Herein we report an effective approach to significantly improve its performance in the methanation of CO /H mixtures. Highly active and stable Ru/γ-Al O catalysts were prepared by high-temperature treatment in the reduct...

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Bibliographic Details
Published inAngewandte Chemie International Edition Vol. 59; no. 50; pp. 22763 - 22770
Main Authors Chen, Shilong, Abdel-Mageed, Ali M, Dyballa, Michael, Parlinska-Wojtan, Magdalena, Bansmann, Joachim, Pollastri, Simone, Olivi, Luca, Aquilanti, Giuliana, Behm, R Jürgen
Format Journal Article
LanguageEnglish
Published Germany 07.12.2020
Subjects
particle shape
Metal-support interactions
CO2 methanation
Lewis basic sites
operando spectroscopy
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Summary:Ru/Al O is a highly stable, but less active catalyst for methanation reactions. Herein we report an effective approach to significantly improve its performance in the methanation of CO /H mixtures. Highly active and stable Ru/γ-Al O catalysts were prepared by high-temperature treatment in the reductive reaction gas. Operando/in situ spectroscopy and STEM imaging reveals that the strongly improved activity, by factors of 5 and 14 for CO and CO methanation, is accompanied by a flattening of the Ru nanoparticles and the formation of highly basic hydroxylated alumina sites. We propose a modification of the metal-support interactions (MSIs) as the origin of the increased activity, caused by modification of the Al O surface in the reductive atmosphere and an increased thermal mobility of the Ru nanoparticles, allowing their transfer to modified surface sites.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202007228