Removal of NO from flue gas by aqueous chlorine-dioxide scrubbing solution in a lab-scale bubbling reactor.
The present study attempts to clean up nitric oxide from the simulated flue gas using aqueous chlorine-dioxide solution in the bubbling reactor. Chlorine-dioxide is generated by chloride-chlorate process. Experiments are carried out to examine the effect of various operating variables like input NO concentration, presence of SO(2), pH of the solution and NaCl feeding rate on the NO(x) removal efficiency at 45 degrees C. Complete oxidation of nitric oxide into nitrogen dioxide occurred on passing sufficient ClO(2) gas into the scrubbing solution. NO is finally converted into nitrate and ClO(2) is reduced into chloride ions. A plausible reaction mechanism concerning NO(x) removal by ClO(2) is suggested. DeNO(x) efficiency increased slightly with the increasing input NO concentration. The presence of SO(2) improved the NO(2) absorption but pH of solution showed marginal effect on NO(2) absorption. NO(x) removal mechanism changed when medium of solution changed from acidic to alkaline. A constant NO(x) removal efficiency of about 60% has been achieved in the wide pH range of 3-11 under optimized conditions.
Deshwal
Bal Raj
BR
Department of Chemistry, A.I.J.H.M. College, Rohtak 124001, Haryana, India.
Jin
Dong Seop
DS
Lee
Si Hyun
SH
Moon
Seung Hyun
SH
Jung
Jong Hyeon
JH
Lee
Hyung Keun
HK
D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D017606:Chlorine Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009589:Nitrogen Oxides / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013458:Sulfur Dioxide / Q000737:chemistry; D018505:Waste Management / Q000379:methods
D000393:Air Pollutants; D017606:Chlorine Compounds; D009589:Nitrogen Oxides; D016877:Oxidants; D010087:Oxides; D013458:Sulfur Dioxide; D012965:Sodium Chloride; C025109:chlorine dioxide