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Morphology-Engineered Highly Active and Stable Ru/TiO2 Catalysts for Selective CO Methanation.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "Morphology-Engineered Highly Active and Stable Ru/TiO2 Catalysts for Selective CO Methanation."

Ru/TiO2 catalysts exhibit an exceptionally high activity in the selective methanation of CO in CO2 and H2-rich reformates, but suffer from continuous deactivation during reaction. Here we report on a successful attempt to overcome this limitation, fabricating highly active and non-deactivating Ru/TiO2 catalysts by morphology-engineering of the TiO2 support. Using anatase TiO2 nanocrystals with mainly {001}, {100} or {101} facets exposed, we show that after an initial activation period Ru/TiO2-{100} and Ru/TiO2-{101} are very stable, while Ru/TiO2-{001} deactivates continuously. Employing different operando / in situ spectroscopies and ex situ characterizations, we show that differences in the catalytic stability are related to differences in the metal-support interactions (MSIs). The stronger MSIs on the defect-rich TiO2-{100} and TiO2-{101} supports not only stabilize flat Ru nanoparticles, while on TiO2-{001} hemispherical particles develop, but also lead to electronic modifications of Ru surface atoms, reflected by a stronger bonding of adsorbed CO on those catalysts than on Ru/TiO2-{001}. Consequences for the performance of these catalysts are discussed.

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This article was published in the following journal.

Name: Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
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