活性炭表面含氧基团对NO的还原作用

NO Reduction by Surface Oxygen-Containing Groups on Active Carbons

通过Ｃ、Ｈ、Ｎ元素分析和Ｂｏｅｈｍ滴定及ＮＨ_３－ＴＰＤ实验揭示了活性炭表面含氧基团数量及分布情况。结果表明，表面含氧基团数量和分布决定了活性炭自身还原性及对ＮＯ的还原能力。活性炭表面含氧基团，特别是－ＣＯＯ基团，可能是最重要的ＮＯ还原反应活性中心。提出了该还原反应的机理。

Four kinds of active carbons(AC) were investigated,which were made of coconut shell(CS),hawthorn nut (HN), mountain peach nut(PN)and coal(C),respectively.Elementary analyses showed that HNAC and PNAC were rich in oxygen-containing,however it was few in CSAC and CAC. Oxygen-containing groups,especially carboxyl groups on active carbons were found to have a great influence on the reducibilities of active carbons. And yet,the carboxyl groups were abundant on HNAC and PNAC,but scarce on CSAC and CAC illustrated by Boehm's titration and NH_3-TPD,Meanwhile,HNAC and PNAC also exhibited much better performance on NO reduction than CSAC and CAC.This revealed that oxygencontaining groups indeed acted as the reactive centers of NO reduction,especially-COOwas the most important.The reaction mechanism of NO reduction was thus proposed.