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不同热解活化条件下制备的污泥炭常温催化氧化NO

周易 邓文义 胡明涛 许铈尧 苏亚欣

周易, 邓文义, 胡明涛, 许铈尧, 苏亚欣. 不同热解活化条件下制备的污泥炭常温催化氧化NO[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60160-3
引用本文: 周易, 邓文义, 胡明涛, 许铈尧, 苏亚欣. 不同热解活化条件下制备的污泥炭常温催化氧化NO[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60160-3
ZHOU Yi, DENG WenYi, HU MingTao, XU ShiYao, SU YaXin. Low temperature catalytic oxidation of NO over sludge char under different pyrolysis activation conditions[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60160-3
Citation: ZHOU Yi, DENG WenYi, HU MingTao, XU ShiYao, SU YaXin. Low temperature catalytic oxidation of NO over sludge char under different pyrolysis activation conditions[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60160-3

不同热解活化条件下制备的污泥炭常温催化氧化NO

doi: 10.1016/S1872-5813(21)60160-3
基金项目: 上海自然科学基金(19ZR1400700)、中央高校基本科研业务费专项资金(2232019D3-24)和上海市科委科研计划(19DZ1204903)资助项目
详细信息
    作者简介:

    周易:zhouyi201508@163.com

    通讯作者:

    Tel:021-67792555,E-mail:dengwy@dhu.edu.cn

  • 中图分类号: X511

Low temperature catalytic oxidation of NO over sludge char under different pyrolysis activation conditions

Funds: The project was supported by the Shanghai Natural Science Foundation (19ZR1400700), the Fundamental Research Funds for the Central Universities (2232019D3-24), and the Scientific Research Project from Science and Technology Commission of Shanghai Municipality (19DZ1204903)
  • 摘要: 以市政污泥为原料制备污泥炭(SC),开展了SC常温催化氧化NO的实验研究。通过对不同热解温度(600 ℃、700 ℃和800 ℃)和不同干基污泥(DS)/KOH混合质量比下(4∶1、3∶1、2∶1和1∶1)的NO脱除特性研究,探究了污泥裂解活化工艺对NO常温催化氧化的影响规律和作用机理。结果表明,热解温度和KOH活化均对SC的催化活性有显著影响,当热解温度由600 ℃升至800 ℃,裂解样的NO转化率由12%升至36%;不同热解温度下,SC的催化活性均随KOH用量增加呈先增大后减小趋势;当热解温度为700 ℃、DS/KOH = 3∶1时,SC的催化活性最优,达到56%;对该样品进一步进行氢气还原处理后,其脱硝效率进一步提升,达到76.5%。研究发现,SC的催化活性与其比表面积有强相关性,其反应机理遵循Eley-Rideal(E-R)模型。
  • 图  1  常温催化氧化NO反应系统

    1.质量流量计;2.气体混合器;3.转化阀门;4.石英管;5.温控仪;6.烟气分析仪;7.热电偶;8.旁通管;9.SC样品;10.加热带

    Figure  1  Reaction system of catalytic oxidation of NO at ambient temperature

    1. Mass flow meter; 2. Gas mixer; 3. Switching valve; 4. Quartz tube; 5. Temperature controller; 6. Gas analyzer; 7. Thermocouple; 8. Bypass tube; 9. SC sample; 10. Heating belt.

    图  2  不同成品SC(从左到右依次为SC-600 ℃(1∶1), SC-700 ℃(2∶1)和 SC-700 ℃(1∶1))

    Figure  2  Different SCs (From left to right are SC-600 ℃ (1∶1), SC-700 ℃ (2∶1), and SC-700 ℃ (1∶1), respectively.)

    图  3  不同SC样品的XRD表征(a:SC-600 ℃(1∶1);b:SC-700 ℃(2∶1);c:SC-700 ℃(1∶1))

    Figure  3  XRD profiles of SCs (a:SC-600 ℃ (1∶1); b: SC-700 ℃ (2∶1); c: SC-700 ℃ (1∶1))

    图  4  SC表面形貌的SEM表征(a:SC-600 ℃;b:SC-700 ℃;c:SC-800 ℃;d:SC-600 ℃(2∶1);e:SC-700 ℃(3∶1);f:SC-800 ℃(4∶1))

    Figure  4  the SEM of SCs (a:SC-600 ℃; b: SC-700 ℃; c: SC-800 ℃; d:SC-600 ℃ (2∶1); e: SC-700 ℃ (3∶1); f: SC-800 ℃ (2∶1))

    图  5  不同SC的碘值

    Figure  5  Iodine value of different SCs

    图  6  不同SC的脱硝曲线图(a: 未添加KOH;b: DS/KOH = 4∶1;c: DS/KOH = 3∶1;d: DS/KOH = 2∶1;e: DS/KOH = 1∶1;f: SC-700°C(3∶1)-H2;反应温度30 ℃,总流量0.5 L/min,NO浓度450 μL/L,O2浓度20 vol.%)

    Figure  6  Denitration curves of different SCs (a: SC without KOH addition; DS/KOH = 4∶1; c: DS/KOH = 3∶1; d: DS/KOH = 2∶1; e: DS/KOH = 1∶1; f: SC-700(3∶1)-H2; Reaction temperature of 30 ℃, total flow rate of 0.5 L/min, inlet NO = 450 μL/L, O2 = 20 vol.%).

    图  7  不同SC的稳态NO转化率

    Figure  7  NO conversion of different SC at stable stage

    图  8  SC的NO转化率与其碘值的联系

    Figure  8  Correlation of NO conversions and iodine values

    图  9  SCs脱硝前后的FITR表征

    Figure  9  FITR of SCs before and after catalytic oxidation of NO

    表  1  DS及不同工况样品的工业成分分析

    Table  1  Proximate analysis of DS and SCs

    SamplesAsh wt.%Volatile matter wt.%Fixed carbon wt.%
    DS43.2449.647.12
    SC-600 ℃6722.6910.31
    SC-600 ℃(4∶1)54.3317.3928.27
    SC-600 ℃(3∶1)53.1220.9325.95
    SC-600 ℃(2∶1)59.4222.1218.46
    SC-600 ℃(1∶1)64.2624.9610.78
    SC-700 ℃73.2214.0812.7
    SC-700 ℃(4∶1)54.2318.1627.61
    SC-700 ℃(3∶1)53.7420.2226.04
    SC-700 ℃(2∶1)56.7622.7720.47
    SC-700 ℃(1∶1)73.8716.239.9
    SC-800 ℃75.0910.8914.02
    SC-800 ℃(4∶1)53.9717.6128.42
    SC-800 ℃(3∶1)55.8318.9425.23
    SC-800 ℃(2∶1)61.9319.2118.86
    SC-800 ℃(1∶1)69.8219.2310.95
    下载: 导出CSV

    表  2  DS的灰分分析

    Table  2  Ash components in DS

    SpeciesFe2O3SiO2Al2O3SO3P2O5TiO2CaOK2O
    wt.%36.64 ± 0.2428.31 ± 0.2310.61 ± 0.159.58 ± 0.157.29 ± 0.132.03 ± 0.071.82 ± 0.071.21 ± 0.05
    下载: 导出CSV
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  • 收稿日期:  2021-06-16
  • 修回日期:  2021-08-24
  • 网络出版日期:  2021-09-20

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