Ring hydrogenation of aromatic compounds in aqueous suspensions of an Rh-loaded TiO2 photocatalyst without use of H2 gas
Ring hydrogenation of aromatic compounds in aqueous suspensions of an Rh-loaded TiO2 photocatalyst without use of H2 gas
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DOI：
10.1039/c7cy01929g
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发表时间：
2018-01
影响因子：
5
通讯作者：
Kousuke Nakanishi;R. Yagi;Kazuya Imamura;A. Tanaka;K. Hashimoto;H. Kominami
中科院分区：
文献类型：
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作者：
Kousuke Nakanishi;R. Yagi;Kazuya Imamura;A. Tanaka;K. Hashimoto;H. Kominami
在钛（IV）氧化物（TiO 2）光催化剂上存在助催化剂辅助的光催化还原（CPR）的各种可能性，特别是无H2和化学选择性的CPR。我们研究了在无H2条件下，在负载金属的TiO 2上具有羧基的芳香族化合物的光诱导环氢化，发现当分别使用铑、水和草酸作为金属助催化剂、溶剂和空穴清除剂时，芳香族化合物几乎定量地氢化成相应的具有羧基的环己烷。考察了不同金属助催化剂、溶剂和空穴清除剂对环加氢反应的影响。根据不同条件下的实验结果，讨论了芳烃和空穴清除剂的光依赖性和吸附行为、TiO2和助催化剂的作用以及反应过程。
There are various possibilities of co-catalyst-assisted photocatalytic reduction (CPR) over a titanium(IV) oxide (TiO2) photocatalyst, especially H2-free and chemoselective CPR. We examined the photoinduced ring hydrogenation of aromatics having a carboxyl group over metal-loaded TiO2 under H2-free conditions and found that the aromatics were almost quantitatively hydrogenated to the corresponding cyclohexanes having a carboxyl group when rhodium, water and oxalic acid were used as a metal co-catalyst, solvent and hole scavenger, respectively. The effects of different metal co-catalysts, solvents and hole scavengers on the ring hydrogenation were also examined. Based on the results obtained under various conditions, the light dependency and adsorption behavior of the aromatics and hole scavengers, the functions of TiO2 and the co-catalyst, and the reaction process are discussed.