中文摘要：

通过程序升温脱附谱的方法探究了266nm激光照射下异丙醇在锐钛矿TiO2（101）表面的光化学，并提出了详细的解离机理．在光照作用下，异丙醇发生分步解离：首先，O-H键断裂生成异丙氧基；然后，仲碳的C-H键在光照的作用下进一步发生解离，从而生成丙酮，两步生成的氢原子均转移到相邻的桥氧上．在升温过程中，这部分氢原子会与分子态的异丙醇发生置换反应，从而以低温水和高温异丙基的形式从表面脱附出来．

英文摘要：

Photocatalysis of 2-propanol on A-TiO2（101） has been investigated using a temperature programed desorption method with 266 nm laser light. A clear mechanism is proposed for photodissociation of 2-propanol on A-TiO2（101）. Acetone product on five coordinate Ti4＋ sites is formed in a stepwise manner in which the O-H dissociation proceeds first and then followed by secondary C-H dissociation of 2-propanol while H atoms are transferred to the adjacent bridge bond oxygen （BBO） sites. Low temperature water is formed in a thermally driven process via H-atom on BBO in exchange with isopropyl groups of molecule 2-propanol, while isopropyl radical desorbs at high temperature during the TPD process. The observation demonstrates the prospect of TiO2 as a photocatalyst for degradation of organics.