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In the biomass combustion process, fuel N in biomass can be oxidized into NO x , causing acid rain and photochemical smog. Some measures should be taken to control NO x emissions from biomass combustion. In this paper, NO reduction over rice husk char in the combustion process was studied in a fixed-bed reactor to optimize the biomass combustion process. The results showed that biomass char was more active in the presence of oxygen to reduce NO than it was in the inert atmosphere. With the increase of oxygen, more NO can be reduced by biomass char. From 973 to 1173 K, NO reduction over rice husk char increased with increasing temperature, whereas the difference between NO reduction with and without oxygen decreased with increasing temperature. Moreover, the presence of CO and SO2 in the combustion process was shown to enhance NO reduction over biomass char to different degrees. Therefore, it is an effective way to reduce NO from biomass combustion by emphasizing NO reduction over biomass char.

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