Conversion of nitric oxide to nitrogen dioxide using hydrogen peroxide

摘要

Detailed chemical kinetic model of hydrogen peroxide (H{sub}2O{sub}2 into diesel exhaust gas has been executed to investigate its effect on the removal of nitric oxide (NO) by changing exhaust gas temperature and H{sub}2O{sub}2 addition amount. Flux analysis has also been done to clarify which reaction mainly affects NO-to-NO{sub}2 conversion. From the results of this study, it is shown that the optimal temperature condition to maximize the removal of NO exists near 500K for OH addition condition, while that for H{sub}2O{sub}O2 addition exists near 800K. It is also shown that temperature window for the removal of NO becomes widened as the initial temperature of the exhaust gas increases, and NO-to-NO{sub}2 conversion rate decreases in proportion to the concentration of hydrocarbon (HC), although that of the total NO{sub}x remains the same level regardless of HC concentration. Finally, it is shown that HO{sub}2+ NO→NO{sub}2+OH is mainly responsible for NO-to-NO{sub}2 conversion.