Photo Selective Catalytic Reduction of NO Pollutant
碩士 === 國立臺灣大學 === 化學工程學研究所 === 96 === Photo-assisted selective catalytic reduction of nitric oxide (NO) was studied over a series of metal-loaded P25 at room temperature. Propane was used as a reducing agent. The activities of metal-loaded M (Pd, Rh)/TiO2 photocatalysts, prepared via the incipient w...
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| Format: | Others |
| Language: | en_US |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/09851817615667124438 |
| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 96 === Photo-assisted selective catalytic reduction of nitric oxide (NO) was studied over a series of metal-loaded P25 at room temperature. Propane was used as a reducing agent. The activities of metal-loaded M (Pd, Rh)/TiO2 photocatalysts, prepared via the incipient wetness impregnation method, were compared using a continuous flow reactor. Under UV (350-500nm) irradiation, Pd/TiO2 showed superior photo activity when compared to PdRh/TiO2 and Rh/TiO2. Propane adsorption on the photocatalyst plays a significant role in photo-SCR reaction to react with adsorbed NO. The activity of the Pd/TiO2 catalyst could be significantly increased after reduction with hydrogen at 500°C for 2hr. A possible reaction mechanism was proposed based on the product species found from IR spectroscopy. Nitrous oxide (N2O) was observed on the surface of catalysts loaded with palladium and could be a reaction intermediate or by-product. However N2O was either not present in the gas phase or its concentration was below the detection limit of gas chromatography. The results indicate that Pd/TiO2 under UV irradiation using propane reducing agent can effectively reduce NO pollutant at room temperature to harmless N2.
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