研究气体分子在固体表面吸附过程的化学和物理性质在气体传感器研究方面有着重要的意义。尤其是一些小分子与氧化物的作用受到人们广泛的关注.SnO2具有特殊的表面性质,是适合用于催化有机物的光催化剂,同时由于SnO2在易燃易爆危险气体和有机物的检测等方面有着特殊而广阔的应用前景,成为化学工作者研究的热点.甲醇在SnO2表面吸附解离的反应机理研究对许多金属氧化物作为催化剂的化学反应有着重要的理论指导作用.
Density functional theory and slab model are used to investigate methanol adsorption and decomposition on SnO2 (110) surface. The obtained result shows the most favorite adsorption site for methanol is the fivefold-coordinated tin atoms. The hydrogen atom was broken from hydroxyl group and bounded to the bridging oxygen atom (Ob ) of SnO2 to form the new H - O bond. The calculated activation energy barrier for methanol dissociation reaction over SnO2 surface is 44.3 k J/mol.