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Issue 11, 2019
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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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Supplementary files

Article information


Submitted
16 Dec 2018
Accepted
11 Feb 2019
First published
11 Feb 2019

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2019,10, 3161-3167
Article type
Edge Article

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, 10, 3161
DOI: 10.1039/C8SC05608K

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