Heterogeneous reaction of formaldehyde on the surface of TiO2 particles
Heterogeneous reaction of formaldehyde on the surface of TiO2 particles
复制标题
TiO2颗粒表面甲醛的非均相反应
DOI：
10.1007/s11426-010-4158-x
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发表时间：
2010-12
期刊：
影响因子：
--
通讯作者：
唐孝炎
中科院分区：
文献类型：
--
作者：
唐孝炎
采用漫反射红外光谱（DRIFTS）结合离子色谱（IC）、X射线衍射（XRD）和透射电子显微镜（TEM）原位研究了甲醛（HCHO）在二氧化钛（TiO 2）表面的非均相反应。甲酸酯，二聚甲醛，甲氧基，和聚甲醛观察到在反应过程中的二氧化钛颗粒的红外光谱。在TiO 2表面，吸附的甲醛首先被氧化成甲醛，然后进一步被氧化成甲酸。研究了温度和紫外线对反应产物和反应吸收系数的影响，结果表明，温度升高和紫外线照射下，反应速率加快。提出了在黑暗和紫外光照射下甲醛在TiO 2表面的非均相反应机理。动力学测量表明，甲酸盐在TiO 2上的形成在甲醛浓度下为二级反应，室温下用Brunauer-Emmett- Teller比表面积计算的初始反应吸收系数为（0.5-5）× 10−8（[甲醛]：1 × 1013−2 × 1014 molecules/cm 3）。吸收系数与浓度之间存在线性函数关系。测定了反应的表观活化能。
The heterogeneous reaction of formaldehyde (HCHO) on the surface of titanium dioxide (TiO2) was investigated in situ using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with ion chromatography (IC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Formate, dioxymethylene, methoxy, and polyoxymethylene were observed in the infrared spectra of TiO2 particles during the reaction. On the surface of TiO2, the adsorbed HCHO was first oxidized to dioxymethylene and further oxidized to formate. The effects of temperature and ultraviolet radiation (UV) on the reaction products and reactive uptake coefficients were studied, and the results indicate that the reaction rate can be accelerated at increasing temperatures as well as under UV. The heterogeneous reaction mechanisms of HCHO on the surface of TiO2 in the dark and under UV irradiation are proposed. Kinetic measurements show that formate formation on TiO2 is second order in HCHO concentration and the initial reactive uptake coefficients at room temperature calculated with the Brunauer-Emmett- Teller specific surface area are (0.5–5) × 10−8 ([HCHO]: 1 × 1013−2 × 1014 molecules/cm3). A linear function relationship exists between the uptake coefficient and the concentration. The apparent activation energy of the reaction was also determined.
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影响因子：
22.1
作者：
C. Raillard;V. Héquet;P. Cloirec;J. Legrand
通讯作者：
C. Raillard;V. Héquet;P. Cloirec;J. Legrand
影响因子：
8.8
作者：
Hongmin Liu;Z. Lian;Xiaojiang Ye;W. Shangguan
通讯作者：
Hongmin Liu;Z. Lian;Xiaojiang Ye;W. Shangguan
影响因子：
6.7
作者：
Xin Zhang;Qingquan Liu
通讯作者：
Xin Zhang;Qingquan Liu
影响因子：
11.4
作者：
GROSJEAN, D
通讯作者：
GROSJEAN, D
影响因子：
1.1
作者：
G. Popova;T. V. Andrushkevich;Y. Chesalov;E. Stoyanov
通讯作者：
G. Popova;T. V. Andrushkevich;Y. Chesalov;E. Stoyanov