温和条件下甲醛在Pt/TiO_2上催化氧化反应的原位漫反射红外光谱研究  

In-Situ DRIFTS Study on Catalytic Oxidation of Formaldehyde over Pt/TiO_2 under Mild Conditions

作　　者：何运兵[1] 纪红兵[1] 

机构地区：[1]中山大学化学与化学工程学院,广东省低碳化学与过程节能重点实验室,广东广州510275

出　　处：《催化学报》2010年第2期171-175,共5页

基　　金：国家自然科学基金(20776053);新世纪优秀人才支持计划(NCET-06-740)

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.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 formalde- hyde could be oxidized to H2O and CO2 over Pt/TiO2 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/TiO2 could be decomposed completely by increasing the reaction temperature to 100℃, and the catalyst activity could be recovered simultaneously.

关 键 词：原位漫反射红外光谱 甲醛氧化 铂 二氧化钛 

分 类 号：O643.32[理学—物理化学]