利用原子层沉积技术在载体TiO₂上沉积尺寸均一的Pt纳米粒子得到Pt/TiO₂催化剂，研究了不同还原温度对其催化肉桂醛加氢性能的影响。结果表明，与未经高温还原的Pt/TiO₂相比，经700℃还原的催化剂Pt/TiO₂-700对肉桂醛的加氢活性提高了29.2%，对肉桂醇的选择性提高了40.5%。通过TEM、XPS和XRD等分析手段对催化剂的形貌、电子状态及晶体结构等进行表征，结果表明，高温还原有利于增大Pt纳米粒子和改变电子状态，从而提高其催化性能。

The uniform Pt nanoparticles are deposited on TiO₂ supporters by atomic layer deposition to prepare Pt/TiO₂ catalyst.Effect of temperature on catalytic properties of Pt/TiO₂ catalyst in the hydrogenation of cinnamaldehyde is studied.It is verified that compared with the Pt/TiO₂ catalyst not reduced at high temperature, there is an increase of 29.2% for the hydrogenation activity for cinnamaldehyde over the Pt/TiO₂ catalyst that has been reduced at 700℃ and an increase of 40.5% for the selectivity to cinnamyl alcohol.Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) are used to characterize the morphology, electronic stats and crystal structure of Pt/TiO₂-700 catalyst, and the results state that high temperature reduction is beneficial to the increase of Pt nanoparticles' size and the change of the electronic state, and therefore promotes catalytic performances.

郝佳伟(1991-),男,硕士研究生,研究方向为多相催化,jiawei91@outlook.com。