Effects of CH4 and CO on the reduction of nitric oxide to nitrogen in a discharge reactor.
Additives are often added to enhance the efficiency of NO removal. This study uses a radio frequency (rf) discharge to consider the effect of added CH4 and CO to simulated NO/N2/O2/H2O mixtures on the elevation of NO conversion and the reduction of NO into N2. The enhancement levels of NO conversion when using various additives were found to be in this order: +CH4 > +CO > no additive. NO conversion reached 99.3%, 86.2%, and 77.6% when adding CH4, CO, and without additive, respectively, at inlet additive/NO molar ratio (R) = 5 and at 120 W. Moreover, the fraction of total N atoms converted from NO into N2 (FN2) was very high, reaching 99.4% and 99.5% when adding CH4 and CO, respectively, at R = 1 and at 120 W. The better operating conditions are using CH4 as the additive at R > or = 1 and a power of > 60 W to reach a higher NO conversion with a higher FN2. However, it should be noted that this rf plasma approach is not practical at this stage because of its relative low pressure.
Tsai
Cheng-Hsien
CH
Department of Chemical and Material Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, Republic of China. chtsai@cc.kuas.edu.tw
Hsieh
Lien-Te
LT
Chang
Juu-En
JE
Kuo
Yi-Ming
YM
Tsai
Ying-I
YI
D002248:Carbon Monoxide / Q000737:chemistry*; D005740:Gases / Q000032:analysis; D008697:Methane / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction
D005740:Gases; D009569:Nitric Oxide; D002248:Carbon Monoxide; D009584:Nitrogen; D008697:Methane