Morphology‐Engineered Highly Active and Stable Ru/TiO 2  Catalysts for Selective CO Methanation | Zendy

Chen Shilong | Zendy; AbdelMageed Ali M. | Zendy; Li Dan | Zendy; Bansmann Joachim | Zendy; Cisneros Sebastian | Zendy; Biskupek Johannes | Zendy; Huang Weixin | Zendy; Behm R. Jürgen | Zendy

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Morphology‐Engineered Highly Active and Stable Ru/TiO 2 Catalysts for Selective CO Methanation

Author(s) -

Chen Shilong,

AbdelMageed Ali M.,

Li Dan,

Bansmann Joachim,

Cisneros Sebastian,

Biskupek Johannes,

Huang Weixin,

Behm R. Jürgen

Publication year - 2019

Publication title -

angewandte chemie international edition

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.831

H-Index - 550

eISSN - 1521-3773

pISSN - 1433-7851

DOI - 10.1002/anie.201903882

Subject(s) - methanation , catalysis , anatase , materials science , chemical engineering , ruthenium , nanocrystal , nanoparticle , transition metal , adsorption , nanotechnology , inorganic chemistry , photocatalysis , chemistry , organic chemistry , engineering

Ru/TiO 2 catalysts exhibit an exceptionally high activity in the selective methanation of CO in CO 2 ‐ and H 2 ‐rich reformates, but suffer from continuous deactivation during reaction. This limitation can be overcome through the fabrication of highly active and non‐deactivating Ru/TiO 2 catalysts by engineering the morphology of the TiO 2 support. Using anatase TiO 2 nanocrystals with mainly {001}, {100}, or {101} facets exposed, we show that after an initial activation period Ru/TiO 2 ‐{100} and Ru/TiO 2 ‐{101} are very stable, while Ru/TiO 2 ‐{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 TiO 2 ‐{100} and TiO 2 ‐{101} supports stabilize flat Ru nanoparticles, while on TiO 2 ‐{001} hemispherical particles develop. The former MSIs also lead to electronic modifications of Ru surface atoms, reflected by the stronger bonding of adsorbed CO on those catalysts than on Ru/TiO 2 ‐{001}.

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