Ring hydrogenation of aromatic compounds in aqueous suspensions of an Rh-loaded TiO2 photocatalyst without use of H2 gas,Catalysis Science & Technology

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Ring hydrogenation of aromatic compounds in aqueous suspensions of an Rh-loaded TiO2 photocatalyst without use of H2 gas
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-11-13 00:00:00 , DOI: 10.1039/c7cy01929g
Kousuke Nakanishi _{1,

2,

3,

4,

5} , Ryosuke Yagi _{1,

2,

3,

4,

5} , Kazuya Imamura _{3,

4,

5,

6,

7} , Atsuhiro Tanaka _{3,

4,

5,

6,

7} , Keiji Hashimoto _{3,

4,

5,

6,

7} , Hiroshi Kominami _{3,

4,

5,

6,

7}

Affiliation

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.

中文翻译：

在不使用H ₂气体的情况下，Rh负载的TiO ₂光催化剂的水悬浮液中芳族化合物的环氢化

在氧化钛（IV）（TiO ₂）光催化剂上，尤其是无H ₂和化学选择性CPR上，助催化剂辅助的光催化还原（CPR）有多种可能性。我们研究了在H ₂下金属负载的TiO _2上具有羧基的芳族化合物的光诱导环氢化无条件的条件下，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，芳族化合物几乎被定量氢化为相应的具有羧基的环己烷。还研究了不同的金属助催化剂，溶剂和空穴清除剂对环氢化的影响。根据在各种条件下获得的结果，讨论了芳族化合物和空穴清除剂的光依赖性和吸附行为，TiO ₂和助催化剂的功能以及反应过程。

更新日期：2017-11-23

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