激光促进甲醇在杂多化合物上的表面反应

Laser Stimulated Surface Reaction of Methanol on Heteropoly Compounds

利用红外光谱 (IR)、程序升温脱附 (TPD)和激光促进表面反应 (L SSR)技术 ,研究了甲醇吸附于杂多化合物 H3PMo1 2 O40 · x H2 O、H3PW1 2 O40 · x H2 O、H6 PMo6 W6 O40 · x H2 O表面上所形成体系的振动结构、化学吸附形态和光促表面反应规律 .实验结果表明 ,在各固体材料表面上甲醇同时发生分子吸附和解离吸附 ,且在室温条件下体系即发生显著的光促表面反应 ;与甲醇吸附强度和吸附量相比 ,反应体系的振动结构对 L SSR效率起着更重要的作用 .根据表征和反应结果 ,分析了体系中活性物种的产生途径 。

Methanol was selected as a model reactant to carry out laser stimulated surface reaction(LSSR), where heteropoly compounds H 3PMo 12 O 40 · x H 2O? H 3PW 12 O 40 · x H 2O and H 6PMo 6W 6O 40 · x H 2O were used as solid surface materials and a TEA CO 2 laser generator was used as light source. Basing on IR and TPD tests, the vibration modes were discussed. It is shown that methanol is adsorbed on the surfaces in both molecular and decomposed states. The results of reaction experiments show that, methanol decomposition reaction induced by laser takes place at room temperature, and the solid materials are able to increase the methanol conversion obviously. The vibration mode of the reacting system was confirmed to be the most important factor to influence the LSSR efficiency. Finally the routes of active species generation in the system were discussed and the LSSR mechanism of methanol on heteropoly compounds was presented.