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Investigation of NO conversion by different types of sewage sludge chars under low temperature

机译:低温下不同类型污泥焦转化为NO的研究

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摘要

Different types of sludge chars, i.e. the original (S1), HNO3washed (S2), KOH activated (S3), and H2reduced chars, were prepared to investigate their performances for NO conversion under low temperature. Results indicated that the surface area of the sludge chars did not play key role on NO conversion. S1 showed the higher NO conversion performance than S2 and S3, due to the reducing effect of iron components in S1 (mainly FeS and Fe2P). Both H2reduction at high temperature and the followed cooling atmosphere (H2or N2) have great influences on the activity of S1. H2reduction can promote the reducing capacity of the iron components, thus the performance of S1 for NO conversion was also significantly enhanced. However, NO conversion over S1 decreased in the presence of O2, because the iron components were more quickly oxidized in O2atmosphere. Results of duration tests showed that the activity of S1 decreased with time, but it can be recovered by calcination in N2. The profiles of the temperature programmed desorption (TPD) of CO and CO2indicated that CO and CO2emissions are mainly from the decomposition of oxygen functional groups (OFGs), including anhydrides, phenols, esters, and carboxylic acid. Furthermore, mechanisms of NO adsorption and conversion by S1−S3 were explored by an in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). It was found that NO adsorbed on the sludge chars mainly transferred into NO2species at 50 °C, and then NO2species were gradually oxidized to nitrate species with the increase of temperature. Finally, the possible reaction routes for NO conversion were proposed based on experimental data.
机译:准备了不同类型的污泥炭,即原始(S1),HNO3洗涤(S2),KOH活化(S3)和H2还原的炭,以研究其在低温下NO转化的性能。结果表明,污泥炭的表面积对NO的转化没有关键作用。由于S1中铁元素(主要是FeS和Fe2P)的还原作用,S1显示出比S2和S3更高的NO转化性能。高温下的H2还原和随后的冷却气氛(H2或N2)都对S1的活性有很大的影响。 H 2的还原可以促进铁组分的还原能力,因此S1的NO转化性能也得到了显着提高。但是,在O2存在下,S1上的NO转化率降低了,因为铁组分在O2气氛中被更快地氧化。持续时间测试的结果表明,S1的活性随时间降低,但可以通过在N2中煅烧来恢复。 CO和CO2的程序升温脱附(TPD)曲线表明,CO和CO2排放主要来自氧官能团(OFG)的分解,包括酸酐,酚,酯和羧酸。此外,通过原位漫反射红外傅里叶变换光谱(DRIFTS)探索了S1-S3对NO的吸附和转化机理。发现在50°C时,吸附在污泥炭上的NO主要转移到NO2物种中,然后随着温度的升高,NO2物种逐渐被氧化成硝酸盐。最后,根据实验数据提出了可能的NO转化反应路线。

著录项

  • 来源
    《Journal of Environmental Management》 |2018年第1期|236-244|共9页
  • 作者单位

    College of Environmental Science and Engineering, Donghua University;

    College of Environmental Science and Engineering, Donghua University;

    College of Environmental Science and Engineering, Donghua University;

    College of Environmental Science and Engineering, Donghua University;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sludge char; Pyrolysis; NO conversion; FeS and Fe2P; Activation;

    机译:污泥焦;热解;NO转化;FeS和Fe2P;活化;
  • 入库时间 2022-08-17 13:31:52

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