Department of Physics, Baylor University, Waco, TX 76798, USA.
Phys Chem Chem Phys. 2013 Sep 7;15(33):13897-901. doi: 10.1039/c3cp51695d. Epub 2013 Jul 11.
Understanding the interaction of O2 with ketones on metal oxide surfaces is important for the photo-oxidation of toxic organic molecules. The consecutive reaction steps of acetone molecules with oxygen adatoms (Oa's) on partially oxidized TiO2(110) surfaces have been studied using high-resolution scanning tunneling microscopy (STM) at 300 K. The sequential isothermal STM images reveal two types of acetone-Oa species as a result of reactions of acetone with an oxygen adatom and a bridging bound oxygen vacancy (V(O)). One such species is the Ti5c-bound acetone-Oa diolate formed from Ti5c-bound acetone reacting with Oa. The diolate is mobile at 300 K and can assist the diffusion of surface Oa by exchanging the acetone oxygen with the Oa. The second acetone-Oa species is the V(O)-bound acetone-Oa complex formed from a V(O)-bound acetone reacting with an Oa located on the neighboring Ti row. The V(O)-bound complex is stationary at 300 K. This species has not been reported previously.
理解氧气与金属氧化物表面上的酮之间的相互作用对于有毒有机分子的光氧化非常重要。在 300 K 下，使用高分辨率扫描隧道显微镜（STM）研究了部分氧化 TiO2（110）表面上氧原子（Oa）与丙酮分子的连续反应步骤。顺序等温 STM 图像显示了两种类型的丙酮-Oa 物质，这是由于丙酮与氧原子和桥接氧空位（V（O））的反应所致。其中一种物质是 Ti5c 结合的丙酮-Oa 二醇酸酯，由 Ti5c 结合的丙酮与 Oa 反应形成。二醇酸酯在 300 K 下是可移动的，并且可以通过与 Oa 交换丙酮氧来协助表面 Oa 的扩散。第二种丙酮-Oa 物质是 V（O）结合的丙酮-Oa 络合物，由 V（O）结合的丙酮与位于相邻 Ti 行上的 Oa 反应形成。V（O）结合的络合物在 300 K 下是静止的。这种物质以前没有报道过。
