纳米TiO_2光催化氧化乙醇反应机理的研究

STUDY ON MECHANISM OF PHOTOCATALYTIC OXIDATION OF CH_3CH_2OH BY NANOSCALE TiO_2

以纳米TiO2 为催化剂 ,主波长为 36 4nm的汞灯为光源 ,通过气相色谱测定反应物和生成物的浓度变化 ,分别研究了体积量浓度为 0 1mol·L- 1 的CH3CH2 OH、CH3CHO和CH3COOH水溶液进行光催化氧化反应的速率。经Langmuir Hinshelwood方程进行核算 ,证明该组反应均为零级反应。TEM、XRD、SSA和FT IR PAS对催化剂进行了表征。根据FT IR PAS的检测结果提出了CH3CH2 OH光催化氧化反应的机理 :CH3CH2 OH [O] CH3CHO[O] CH3COOH [O] 碳 碳键断开[O] … [O] CO2 +H2

Nanoscale TiO 2 is used as the photocatalyst in the process of oxidization of CH 3CH 2OH, CH 3CHO, and CH 3COOH with the concentration of 0 1?mol·L -1 aqueous solution respectively Mercury Lamp with the main wavelength of 364?nm is adopted as the light source, and O 2 as reactant From the change of the concentration of the reactant and product detected by gas chromatographs, the reaction's order is confirmed as zero order respectively TiO 2 was characterized by TEM, XRD, SSA and FT IR PAS respectively The FT IR PAS spectra of TiO 2 before and after reaction show that the mechanism of photooxidization for CH 3CH 2OH is: CH 3CH 2OHCH 3CHOCH 3COOHC-C Bond broken...CO 2+H 2O