Journal
APPLIED CATALYSIS A-GENERAL
Volume 578, Issue -, Pages 83-88Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2019.04.001
Keywords
Photocatalyst; TiO2; Ring hydrogenation; Phenol; Cyclohexanol
Categories
Funding
- JSPS KAKENHI [17H03462, 17H04967]
- Precursory Research for Embryonic Science and Technology (PRESTO)
- Japan Science and Technology Agency (JST)
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities
- MEXT and Kindai University
- Japan Society for the Promotion of Science (JSPS) [15J11412]
- Faculty of Science and Engineering, Kindai University
- Grants-in-Aid for Scientific Research [17H03462, 17H04967, 15J11412] Funding Source: KAKEN
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Since photocatalytic reactions are almost consistent with the concept of green chemistry, substance conversion using photocatalysts has recently attracted the attention of researchers in the fields of organic chemistry, physical chemistry and material chemistry. We investigated photoinduced ring hydrogenation of phenol over a metal-loaded titanium(IV) oxide (TiO2) photocatalyst without the use of H-2 gas and we report here the effects of various parameters, including the type and amount of metal co-catalyst loaded on TiO2 and the kinds of solvents and hole scavengers, on the ring hydrogenation. We found that the combination of an Rh co-catalyst, water and oxalic acid resulted in the highest yield of cyclohexanol. Detailed analyses revealed that phenol was first hydrogenated to cyclohexanone via keto-enol tautomerism of cyclohexenol followed by hydrogenation of cyclohexanone to cyclohexanol and that adsorption of phenol onto Rh-TiO2 is a factor of great importance for the ring hydrogenation.
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