In-Situ DRIFTS Study on Catalytic Oxidation of Formaldehyde over Pt/TiO2 under Mild Conditions

The adsorption and oxidation of formaldehyde over 1%Pt/TiO2 under ambient conditions were investigated by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the deactivation of the catalyst was analyzed. It was found that formaldehyde could be oxidized to H2O and CO2 over Pt/TiO2 at ambient temperature, and the decomposition of formate was the key step below 100 °C. The catalyst deactivation at low temperature was attributed to the overcast of active sites by the formate that was failed to be decomposed in time. Nevertheless, the formate on Pt/TiO2 could be decomposed completely by increasing the reaction temperature to 100 °C, and the catalyst could be recovered simultaneously.

摘要采用原位漫反射红外光谱研究了温和条件下1%Pt/TiO2催化剂上甲醛的吸附和氧化反应,并对催化剂的失活进行了分析.结果表明,Pt/TiO2催化剂在室温条件下即可将甲醛氧化成H2O和CO2,100oC以下甲酸根的分解为决速步骤,低温下催化剂失活是由于表面未能及时分解的甲酸根占据了催化剂的活性位,升温至100oC即可将甲酸根完全分解并恢复催化剂的活性.

Graphical abstractFormaldehyde can be oxidized into CO2 and H2O over Pt/TiO2 at ambient temperature in the presence of oxygen, and the decomposition of formate is the key step in the reaction at low temperature (30–90 °C). The formate can be decomposed completely at above 100 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide