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Selective Photocatalytic CC Coupling of Bioethanol into 2,3‐Butanediol over Pt‐Decorated Hydroxyl‐Group‐Tunable TiO 2 Photocatalysts
Abstract 2,3‐Butanediol (2,3‐BD) was synthesized through TiO 2 ‐photocatalytic CC coupling of bioethanol synchronously with the liberation of an energy H 2 molecule in an anaerobic atmosphere. It was found that the selectivity of 2,3‐BD is controlled by the amount of . OH. The less the . OH, the hi...
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Published in: | ChemCatChem 2015-08, Vol.7 (15), p.2384-2390 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Abstract
2,3‐Butanediol (2,3‐BD) was synthesized through TiO
2
‐photocatalytic CC coupling of bioethanol synchronously with the liberation of an energy H
2
molecule in an anaerobic atmosphere. It was found that the selectivity of 2,3‐BD is controlled by the amount of
.
OH. The less the
.
OH, the higher the 2,3‐BD selectivity. Furthermore, it was revealed that the amount of
.
OH increases with the increasing of the surface OH groups on TiO
2
photocatalyst. The introduction of water is in favor of the CC coupling pathway. This can be attributed to the stronger interaction between water and TiO
2
, which is beneficial to recovering the OH groups and promoting the desorption of
.
CH(OH)CH
3
intermediates, thus suppressing the thermodynamically favorable overoxidation of
.
CH(OH)CH
3
into acetaldehyde and promoting the CC coupling into 2,3‐BD. Based on the findings, the 2,3‐BD selectivity was greatly enhanced from approximately 2.6 % to approximately 65 % over Degussa P25‐TiO
2
photocatalyst through fluorine substitution of surface OH groups. |
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ISSN: | 1867-3880 1867-3899 |
DOI: | 10.1002/cctc.201500326 |