Journal
ACS CATALYSIS
Volume 7, Issue 5, Pages 3147-3151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b00312
Keywords
single-site catalyst; layered double hydroxide; ruthenium; CO2 hydrogenation; formic acid
Categories
Funding
- JST-PRESTO
- Japan Society for the Promotion of Science (JSPS) [26220911, 25289289, 26630409, 26620194]
- MEXT
- Grants-in-Aid for Scientific Research [16K14478, 26220911] Funding Source: KAKEN
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In order to achieve an economical CO2-mediated hydrogen energy cycle, the development of heterogeneous catalysts for CO2 hydrogenation to formic acid is an urgent and challenging task. In this study, a stable and well-defined single-site Ru catalyst on the surface of a layered double hydroxide (LDH) in a basic medium is proven to be efficient for selective hydrogenation of CO2 to formic acid under mild reaction conditions (2.0 MPa, 100 degrees C). The electron-donating ability of triads of basic hydroxyl ligands with a particular location is crucial for an active electron-rich Ru center. There is a strong correlation between catalytic activity and adjustable CO2 adsorption capacity in the vicinity of the Ru center. Such electronic metal-support interactions and a CO2 concentration effect result in a significant positive influence on the catalytic activity.
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