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活性炭纤维联合脱硫脱硝的机理分析

DOI: 10.13334/j.0258-8013.pcsee.2015.10.016, PP. 2495-2503

Keywords: 活性炭纤维(ACF),脱硫脱硝,傅里叶变换红外光谱分析(FTIR),程序升温脱附试验(TPD)

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Abstract:

在小型固定床吸附试验台上开展了黏胶基活性炭纤维吸附SO2和NO的实验研究,考察样品在N2和O2气氛下单独吸附SO2和NO及NO吸附暂态反应与联合吸附的区别,结合傅里叶变换红外光谱分析(FTIR)、程序升温脱附试验(TPD)分析吸附前后活性炭纤维表面官能团的变化及吸附强度,以此探讨活性炭纤维联合脱硫脱硝的机理。结果表明:氮气气氛下吸附态SO2和NO被活性炭纤维表面含氧官能团氧化。O2气氛下吸附SO2实验过程中,活性炭纤维表面部分含氮官能团被O2氧化为亚硝基基团,此基团为SO2的吸附提供活性位;O2气氛下吸附NO实验过程中,吸附态NO被氧化为—NO3官能团;联合吸附过程中,吸附态的NO在O2气氛下被氧化为—NO2、—NO3基团,吸附态NO被氧化为—NO2和—NO3形式,SO2与此含氮官能团形成络合物,络合过程中—NO2、—NO3基团被还原并释放出NO和NO2气体,吸附态的SO2被氧化为高价氧化态S形式。

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