Abstract
The direct hydrogenation of CO 2 to higher alcohols has the potential to turn the main contributor of global warming into a valuable feedstock. However, for this technology to become attractive, more efficient and, especially, selective catalysts are required. Here we present a high throughput study on the influence of different promoters on the CO 2 hydrogenation performance of Rh-SiO 2 catalysts. Fe and K promoters were found to improve ethanol selectivity at the expense of undesired CH 4 . The best-performing catalyst, with a composition 2 wt.% K, 20 wt.% Fe, and 5 wt.% Rh, displays an EtOH selectivity of 16% at CO 2 conversion level of 18.4% and CH 4 selectivity of 46%. The combination of different characterization techniques and catalyst screening allowed us to unravel the role of each catalyst component in this complex reaction mechanism.
Original language | English (US) |
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Journal | ChemCatChem |
DOIs | |
State | Published - Apr 21 2021 |
Bibliographical note
KAUST Repository Item: Exported on 2021-04-27Acknowledgements: Saudi Aramco is gratefully acknowledged for financial support. The authors acknowledge Jullian Vittenet (KAUST) for ICP-OES measurements, Anissa Bendjeriou Sedjerari (KAUST) and Tiny Verhoeven (TU/e) for their assistance.
ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Organic Chemistry
- Catalysis