Cyclohexylamine (CHA) is used as an important raw material in chemical industries. Since the production of CHA requires a high temperature and excess amounts of hydrogen gas (H₂) and ammonia, the development of a simple reaction operated under milder conditions using a safe compound is indispensable for achieving sustainable chemistry. A highly selective ring hydrogenation of aniline (AN) to CHA over a titanium(IV) oxide photocatalyst having a co-catalyst in water at room temperature, in which oxalic acid was used as the hydrogen source in place of H₂, is described in this paper. Among TiO₂ photocatalysts having co-catalysts, Rh-TiO₂ showed high activity for CHA production, while Pd-TiO₂ and Ru-TiO₂ showed negligible activity. When a bimetallic photocatalyst, Ru/Pd-TiO₂, was used, the yield was larger than that when Rh-TiO₂ was used. Metal particles loaded on TiO₂ were observed by using TEM, and electronic states of Ru and Pd were evaluated by using XPS. Interactions among metal, AN and CHA were investigated through adsorption experiments. Based on the results, active sites for AN hydrogenation are discussed.

环己胺（CHA）在化学工业中用作重要原料。由于CHA的生产需要高温和过量的氢气（H ₂）和氨气，因此，在较温和的条件下使用安全的化合物进行简单反应的开发对于实现可持续的化学是必不可少的。在室温下，在水中具有助催化剂的氧化钛（IV）光催化剂上，苯胺（AN）的高选择性环氢化为CHA，其中草酸代替H ₂用作氢源。这张纸。在具有助催化剂的TiO ₂光催化剂中，Rh-TiO ₂表现出高的CHA生成活性，而Pd-TiO ₂和Ru-TiO₂显示的活性可以忽略不计。当使用双金属光催化剂Ru / Pd-TiO _2时，产率高于使用Rh-TiO ₂时的产率。通过TEM观察负载在TiO ₂上的金属粒子，并通过XPS评估Ru和Pd的电子态。通过吸附实验研究了金属，AN和CHA之间的相互作用。基于结果，讨论了AN加氢的活性位点。