REMOVAL OF MULTIPLE AIR POLLUTANTS BY GAS-PHASE REACTIONS OF HYDROGEN PEROXIDE

摘要

This paper demonstrates the feasibility of multiple pollutants removal (NO, SO_3, CH_4, and CO) by hydrogen peroxide injection within reaction times (0.2-2.0 s), temperatures (600-1100 K), and other conditions which are in the practical range for its application in boilers, furnaces, engines and other combustion installations. In the presence of H_2O_2, maximum NO-to-NO_2 conversion was 95% in the flow system and 87% in pilot-scale at H_2O_2/NO = 1.5. SO_3 was effectively converted to SO_2 with up to 85% efficiency. CO-to-CO_2 conversion was slightly enhanced by about 20% at temperatures of about 900 K. Formation of carbon monoxide is incrementally increases when methanol is added to H_2O_2. Mixtures of methanol and hydrogen peroxide can be injected to remove NO and to meet CO regulations at reduced cost for the additive. In the presence of H_2O_2, CH_4 is effectively (70-90%) removed from flue gas at 1000 K and at H_2O_2/NO= 0.9-2.2. Kinetic modeling describes quantitatively or at least qualitatively all substantial features of NO, SO_3, CO and CH_4 reactions with H_2O_2.