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首页> 外文期刊>Catalysis science & technology >Ceria promotion of acetaldehyde photo-oxidation in a TiO2-based catalyst: a spectroscopic and kinetic study
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Ceria promotion of acetaldehyde photo-oxidation in a TiO2-based catalyst: a spectroscopic and kinetic study

机译：基于TIO2的催化剂中乙醛光氧化的销售：光谱和动力学研究

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摘要

A spectroscopic and kinetic study of the photo-oxidation of acetaldehyde with a CeO2-TiO2 composite catalyst is presented. Both UV and visible illumination conditions were tested. The study focuses on analysing the role of ceria in the photocatalytic behaviour by contrasting the CeO2-TiO2 behaviour with that of the appropriate TiO2 reference. To this end, we developed an intrinsic kinetic expression with explicit inclusion of the effect of photon absorption on the reaction rate as well as a reaction scheme proposed on the basis of combined Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and Electron Paramagnetic Resonance (EPR) characterization. The combination of spectroscopic and kinetic tools provides quantitative evidence that the oxide-oxide contact controls the activity of the composite catalyst through the number of hole-related species able to attack the pollutant, this in turn being related to the influence of ceria defects on charge carrier fate. The abovementioned key properties controlling photoactivity are the same for UV and visible excitation, producing a highly active photocatalyst suitable for sunlight applications.
机译：提出了对使用CEO2-TIO2复合催化剂的乙醛光氧化的光谱和动力学研究。测试了紫外线和可见的照明条件。该研究的重点是通过将CEO2-TIO2行为与适当的TIO2参考的CEO2-TIO2行为进行对比，从而分析陶瓷在光催化行为中的作用。为此，我们开发了一种固有的动力学表达，并明确包含了光子吸收对反应速率的影响以及根据组合弥漫性反射率红外傅立叶变换光谱（漂移）和电子磁共振共振（EPR）提出的反应方案（EPR ）表征。光谱和动力学工具的组合提供了定量的证据，表明氧化物 - 氧化物接触通过能够攻击污染物的孔相关物种的数量来控制复合催化剂的活性，这反过来又与陶瓷缺陷对电荷的影响有关承运人命运。对于紫外线和可见的激发，控制光活性的上述关键特性是相同的，可产生适合阳光应用的高度活性光催化剂。

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