采用原位漫反射红外光谱研究了温和条件下1%Pt/TiO_2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/TiO_2催化剂在室温条件下即可将甲醛氧化成H_2O和CO_2,100℃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100℃即可将甲酸根完全分解并恢复催化剂的活性.
The adsorption and oxidation of formaldehyde over 1%Pt/TiO_2 under ambient conditions were investigated by in-situ diffuse re-flectance infrared Fourier transform spectroscopy (DRIFTS), and the deactivation of the catalyst was analyzed. It was found that formalde-hyde could be oxidized to H_2O and CO_2 over Pt/TiO_2 at ambient temperature, and the decomposition of formate was the key step below 100 ℃. 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/TiO_2 could be decomposed completely by increasing the reaction temperature to 100℃, and the catalyst activity could be recovered simultaneously.
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