光催化降解丙酮的原位红外研究

对催化剂.Pt/V2O5/MgF2在反应温度为120～150℃之间进行了光催化降解丙酮的研究,研究在可见光下进行,发现反应温度对光催化反应有明显的影响.在排除热反应的情况下,温度升高能加速丙酮的光催化反应.丙酮的光催化反应是从它的甲基上开始的,可能先生成了CH3COCH2O-吸附物,它进一步被氧化成丙酮醛、丙酮酸以及碳二醛、乙酸和碳一吸附物种,最终氧化成CO2和水.在没有光和较低的反应温度下,有CO生成,但是在可见光的照射下CO被迅速转化成CO2.研究表明,V2O5/MgF2与Pt/V2O5/MgF2为可见光条件下具备活性的光催化剂.

An In-situ FTIR Investigation of Acetone Photodegradation

The acetone photodegradation over Pt/V2O5/MgF2 catalyst was investigated in the temperature region of 120 to 150 C under visible lights.It was found that the reaction temperature has significant influence on catalytic activity.At conditions of ruling out the thermal reaction(usually set the reaction temperature below that that thermal reaction occurs),high reaction temperature favors the photodegradation of acetone.It was found that the photodegradation of acetone starts from the hydrogen abstraction on the methyl group.Possibly,CH3COCH2O-is the first oxidation species,which could be further oxidized to CH3COCO-,CH3COCO2-,CH3CO-,CH3CO2-,and HCO2-.These species were finally oxidized to CO2 and H2O.The investigation shows that under visible light,CO could be converted to CO2 more rapidly.Both V2O5/MgF2 and Pt/V2O5/MgF2 are visible light active catalysts.