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Experimental Study on Photocatalytic Oxidation of NO Over Pt and Pd Doped TiO2 Catalysts

Author: SongShuZhen
Tutor: LiuYue
School: Zhejiang University
Course: Environmental Engineering
Keywords: TiO2 Photocatalytic Oxidation NO Precious Metals TNTs
CLC: X701
Type: Master's thesis
Year: 2012
Downloads: 48
Quote: 0
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Abstract


TiO2 photocatalytic oxidation of NO technology has reaction conditions are mild , low energy consumption , and does not produce secondary pollution , etc. , has a good prospect of application in the control of NOx . The text focused on the precious metals platinum and palladium modified TiO2 photocatalytic oxidation of NO systematic experimental study , the study focused on the preparation conditions on the Pt/TiO2 and the Pd/TiO2 catalyst to obtain optimal prepared conditions , and by XRD characterization methods such as XPS , TPD and PL analysis of the mechanism of the preparation conditions on the catalytic activity . Finally, in order to further improve the efficiency of TiO2 photocatalytic preparation of the surface structure better titanium nanotubes (TNTs) photocatalysts , and precious metals modified TNTs photocatalytic oxidation of NO . First, using the deposition precipitation method were prepared under different pH values ??, the number of Pt loading TiO2 photocatalyst , the effects of pH impact on the the Pt/TiO2 catalysts physicochemical properties and photocatalytic oxidation of NO activity , optimal pH preparation conditions. The results show that when the activity of the catalyst is prepared by the pH at 7 near the highest . In addition, we also investigated the precipitating agent catalyst results prepared when the precipitating agent photocatalytic oxidation of NO with ammonia activity than do the preparation of the catalyst of the precipitating agent increased slightly with NaOH . Secondly , the use of palladium (Pd) modified titania prepared by impregnation , emphasis on the palladium source and calcination temperature on the physical and chemical properties and photocatalytic oxidation of NO activity Pd/TiO2 catalyst , and come to the best preparation conditions . The research results show that after palladium modified catalyst activity has been greatly improved , and the calcination temperature on the catalytic activity , calcination temperature can lead to polymorph composition of the catalyst , the oxidation state of the palladium and adsorption of NO performance changes , thereby affecting the catalyst activity . Finally, a strong alkali hydrothermal method to prepare titanium nanotubes were modified with palladium , effects of calcination temperature , the modified method , the doping concentration of palladium Pd / of TNTs catalyst polymorphs , morphology and photocatalytic oxidation of NO activity . The study results showed that the optimum calcination temperature is 400 ° C , the best modification method using palladium chloride solution to be impregnated after the calcination TNTs-0 , the optimum doping concentration of 0.02% .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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