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首页> 外文期刊>Catalysis science & technology >Oxidative, photo-activated TiO2 nanoparticles in the catalytic acetylation of primary alcohols
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Oxidative, photo-activated TiO2 nanoparticles in the catalytic acetylation of primary alcohols

机译：原代醇的催化乙酰化中的氧化，光激活的TIO2纳米颗粒

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摘要

A series of TiO2 particles of varying particle sizes from nano to micro scales was treated with three different oxidants (O2, TBHP, and aqueous H2O2) under irradiation conditions to form activated TiO2 particles bearing surface peroxo Ti(O2) species. The resultant, heterogeneous catalysts were tested for photo-catalytic acetylation of 2-phenylethanol by acetic anhydride in 8 different solvents. The best scenario involves the use of 32 nm grade of TiO2 nanoparticles and aqueous H2O2 for pre-activation and the use of CH2Cl2 as the reaction solvent. The 2-phenethyl acetate product can be completely formed in 10 h and isolated in essential quantitative yield. It was also found that catalysts derived from TiO2 nanoparticles are superior to those from ZrO2, Y2O3 and WO3 nanoparticles by using the oxidative, photo-activation protocol. The newly developed heterogeneous catalytic system can be smoothly applied to photocatalytic acetylation of several representative primary aliphatic and aromatic alcohols. The intermediacy of Ti-OH or Ti=O surface groups was proposed in the photo-catalytic acetylation conditions.
机译：在辐照条件下，用三种不同的氧化剂（O2，TBHP和H2O2水溶液）处理一系列不同粒径的TiO2颗粒，从纳米到微尺度进行处理，以形成具有表面Peroxo Ti（O2）物种的活化的TIO2颗粒。通过乙乙醇在8种不同的溶剂中测试了2-苯基乙醇的光催化乙酰化测试结果的异质催化剂。最好的情况涉及使用32 nm级的TIO2纳米颗粒和H2O2水性用于预激活和将CH2CL2用作反应溶剂。 2-苯基乙酸酯产物可以在10小时内完全形成，并以基本定量产率分离。还发现，源自TIO2纳米颗粒的催化剂优于Zro2，Y2O3和WO3纳米颗粒的催化剂，使用氧化，光激活方案。新开发的异质催化系统可以平滑地应用于几种代表性的原发性脂肪族和芳族醇的光催化乙酰化。在光催化的乙酰化条件下提出了Ti-OH或Ti = O表面基团的中间。

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