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Study on the Mechanism of Acidity in the Process of Heterogeneous Photocatalysis

Author: WangXinChen
Tutor: LiuPing；FuXianZhi
School: Fuzhou University
Course: Physical and chemical
Keywords: Photocatalytic Sulfated TiO2 Titania Zirconium dioxide Solid superacid Solid acid
CLC: O643.3
Type: Master's thesis
Year: 2002
Downloads: 270
Quote: 3
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Abstract


Sol - gel prepared TiO 2 TiO 2 < / sub > - ZrO 2 < / sub > solid acid and SO 4 2 - / TiO 2 solid superacid photocatalysts , ethylene and methyl bromide photocatalytic degradation reaction indicators reactions , the use of X-ray diffraction , surface area measurement , Fourier transform infrared characterization methods of spectroscopy , X - ray photoelectron spectroscopy , surface photovoltage \u0026 P and Hammett indicator method , the system compares the three series catalyst morphology , surface acidity , spectral characteristics and photocatalytic properties . Also , the use of dual-function probe molecule pyridine as a the photocatalytic reaction probe and the surface acidity of the basic probe , in place of the acidic nature of the surface of the photocatalyst and its photocatalytic properties . The results show that the surface acidification especially super acidification , can significantly improve the catalyst activity, selectivity and moisture resistance , improve the photocatalytic performance possible reasons : 1. Improve the physical and chemical properties of the catalyst , super acidification is the ratio of the catalyst surface increases, the grain refinement, and also inhibit the phase change of the catalyst ; improve the effective separation rate of photoinduced electron - hole pairs , super acidified greatly enhanced acidity of the catalyst surface , the as Brφnsted acid surface bonded together hydroxy photo holes capture center of the bridge super- enhanced bidentate structure of the surface sulfur complex species of photo-generated electron capture trap ; 3. Activated photocatalytic reaction product water , the water molecules through the Brφnsted acid centers of the catalyst surface and Lewis acid centers synergy converted to reactive hydroxyl groups . Based on these results , the paper presents a model of the the superacid Center heterogeneous photocatalytic process , a final design of the in situ experiments confirmed that the model is reasonable .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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