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制备工艺对Fe-Ag/Al2O3的C3H6-SCR性能的影响

田凤国 杨溪 温妮妮 苏亚欣

田凤国, 杨溪, 温妮妮, 苏亚欣. 制备工艺对Fe-Ag/Al2O3的C3H6-SCR性能的影响[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60121-4
引用本文: 田凤国, 杨溪, 温妮妮, 苏亚欣. 制备工艺对Fe-Ag/Al2O3的C3H6-SCR性能的影响[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60121-4
TIAN Feng-guo, YANG Xi, WEN Ni-ni, SU Ya-xin. Effect of preparation technique of Fe-Ag/Al2O3 catalysts on C3H6-SCR activity[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60121-4
Citation: TIAN Feng-guo, YANG Xi, WEN Ni-ni, SU Ya-xin. Effect of preparation technique of Fe-Ag/Al2O3 catalysts on C3H6-SCR activity[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60121-4

制备工艺对Fe-Ag/Al2O3的C3H6-SCR性能的影响

doi: 10.1016/S1872-5813(21)60121-4
基金项目: 上海市自然科学基金(19ZR1401800)和中央高校基本科研业务费专项资金和东华大学研究生创新基金(CUSF-DH-D-2021032)资助
详细信息
    作者简介:

    田凤国:fg.tian@dhu.edu.cn

    通讯作者:

    Tel:021-67792552,E-mail:suyx@dhu.edu.cn

  • #: 共同第一作者
  • 中图分类号: X511

Effect of preparation technique of Fe-Ag/Al2O3 catalysts on C3H6-SCR activity

Funds: The project was supported by the Natural Science Foundation of Shanghai (19ZR1401800) and Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (CUSF-DH-D-2021032)
  • 摘要: 本研究选取了三种具有代表性的负载方式,即物理研磨法、直接浸渍法和溶胶-凝胶-浸渍法。对比考察三种不同制备工艺所得样品催化C3H6选择性还原NO活性的变化特点,实验结果表明,三组催化剂都具有很好的抗H2O和SO2的能力。就最大脱硝效率而言,溶胶-凝胶-浸渍法(100%) > 物理研磨法(62%) > 直接浸渍法(58%)。综合多种表征测试认为主要影响因素包括比表面积和铁银之间的相互作用。对于溶胶-凝胶-浸渍法制得样品,第一载体堇青石与第二载体Al2O3共同作用,既能保证很高的比表面积,同时有利于Fe、Ag离子之间的相互作用,形成了AgFeO2双金属氧化物活性成分,还原性最强。对于物理研磨法,催化剂呈粉末状,虽然比表面积最大,但是没有成型载体的多孔表面为Fe3+、Ag+离子提供交互作用空间。两种金属以氧化物形态(Ag2O和Fe3O4)和少许的单质Ag形式存在,其还原能力较弱。对于直接浸渍法,由于缺少第二载体Al2O3的分散作用,Fe、Ag以各自氧化物成方块晶体在催化剂表面团聚,XRD没有检测AgFeO2,比表面积最小,催化活性最低。
    1)  #: 共同第一作者
  • 图  1  不同制备方式催化剂的活性

    Figure  1  Impacts of preparation methods on the catalytic activity

    (${\varphi _{{\rm{NO}}}} = 0.05{\rm{\% }},\;{\varphi _{{{\rm{C}}_3}{{\rm{H}}_6}}}= 0.5{\rm{\% }},\;{\varphi _{{{\rm{O}}_2}}} = 3{\rm{\% }}$, N2 balanced)

    图  2  H2O和SO2对催化剂活性的影响

    Figure  2  Effect of H2O and SO2 on the catalytic activity

    ($ {\varphi _{{\rm{NO}}}}= 0.05{\rm{\% }},\;{\varphi _{{{\rm{C}}_3}{{\rm{H}}_6}}} = 0.5{\rm{\% }},\;{\varphi _{{{\rm{O}}_2}}} = 3{\rm{\% }},\;{\varphi _{{{\rm{H}}_2}{\rm{O}}}}= 8{\rm{\% }} $, $ {\varphi _{{\rm{S}}{{\rm{O}}_2}}}= 0.02{\rm{\% }} $, N2 balanced)

    图  3  催化剂表面形貌的SEM照片(×5000)

    Figure  3  SEM images of catalysts prepared by different methods

    图  4  不同方法所制样品的XRD谱图

    Figure  4  XRD patterns of catalysts prepared by different methods

    图  5  催化剂的N2吸附-脱附等温曲线

    Figure  5  Adsorption isotherms of nitrogen on prepared catalysts at −196 ℃

    (empty symbols = adsorption; solid symbols = desorption)

    图  6  催化剂样品的H2-TPR谱图

    Figure  6  H2-TPR profiles of prepared catalysts

    表  1  催化剂的微孔隙特性

    Table  1  Textural properties of prepared catalysts

    CatalystABET/(m2·g−1)νp/(cm3·g−1)dp/nm
    GR-Fe/Ag/Al2O3370.05820.9
    DP-Fe/Ag/CM50.02610.2
    DP-Fe/Ag/Al2O3/ CM230.0549.23
    下载: 导出CSV
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  • 收稿日期:  2021-04-26
  • 修回日期:  2021-06-01
  • 网络出版日期:  2021-06-25

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