Journal
CHEMICAL SCIENCE
Volume 10, Issue 11, Pages 3161-3167Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc05608k
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Funding
- National Key R&D Program of China [2016YFB0600901]
- National Natural Science Foundation of China [21525626, 21603159, 21676181]
- Program of Introducing Talents of Discipline to Universities [B06006]
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Oxide-supported Rh nanoparticles have been widely used for CO2 hydrogenation, especially for ethanol synthesis. However, this reaction operates under high pressure, up to 8 MPa, and suffers from low CO2 conversion and alcohol selectivity. This paper describes the crucial role of hydroxyl groups bound on Rh-based catalysts supported on TiO2 nanorods (NRs). The RhFeLi/TiO2 NR catalyst shows superior reactivity (approximate to 15% conversion) and ethanol selectivity (32%) for CO2 hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion and high-density hydroxyl groups on TiO2 NRs. Hydroxyls are proven to stabilize formate species and protonate methanol, which is easily dissociated into *CHx, and then CO obtained from the reverse water-gas shift reaction (RWGS) is inserted into *CHx to form CH3CO*, followed by CH3CO* hydrogenation to ethanol.
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