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Hydroxyl-mediated ethanol selectivity of CO2 hydrogenation

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Abstract

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 (≈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.

Graphical abstract: Hydroxyl-mediated ethanol selectivity of CO2 hydrogenation

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Publication details

The article was received on 16 Dec 2018, accepted on 11 Feb 2019 and first published on 11 Feb 2019


Article type: Edge Article
DOI: 10.1039/C8SC05608K
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Hydroxyl-mediated ethanol selectivity of CO2 hydrogenation

    C. Yang, R. Mu, G. Wang, J. Song, H. Tian, Z. Zhao and J. Gong, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C8SC05608K

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