| Environmental Engineering |
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| Effect of nitrogen doping on the reduction of nitric oxide with activated carbon in the presence of oxygen |
| Xian-kai WAN, Hui-xiang SHI, Xue-quan ZOU, Peng GE, Da-hui WANG |
| Institute of Environmental Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract Nitrogen doping of activated carbon (AC) was performed by annealing both in ammonia and nitric oxide, and the activities of the modified carbons for NO reduction were studied in the presence of oxygen. Results show that nitrogen atoms were incorporated into the carbons, mostly in the form of pyridinic nitrogen or pyridonic nitrogen. The effect of nitrogen doping on the activities of the carbons can be ignored when oxygen is absent, but the doped carbons show desirable activities in the low temperature regime (≤500 °C) when oxygen is present. The role of the surface nitrogen species is suggested to promote the formation of NO2 in the presence of oxygen, and NO2 can facilitate decomposition of the surface oxygen species in the low temperature regime.
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Received: 20 July 2007
Published: 25 November 2007
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