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首页> 外文期刊>RSC Advances >Mechanism and regeneration of sulfur-poisoned Mn-promoted calcined NiAl hydrotalcite-like compounds for C3H6-SCR of NO
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Mechanism and regeneration of sulfur-poisoned Mn-promoted calcined NiAl hydrotalcite-like compounds for C3H6-SCR of NO

机译：用于C3H6-SCR的硫中毒Mn-Prodiced煅烧煅烧尼亚水滑石样化合物的机理和再生

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摘要

The selective catalytic reduction of NO with propene (C3H6-SCR) in the presence of SO2 was investigated over a series of Mn-promoted calcined NiAl hydrotalcite-like compounds. The obtained 5% MnNiAlO catalyst exhibits superior NO conversion efficiency (95%) at 240 degrees C, and excellent sulfur-poisoning resistance. The possible reaction pathways of the catalytic process were proposed according to several characterization measurements. It is demonstrated that Mn-promoted NiAlO catalysts enhance the Bronsted acid sites and surface active oxygen groups, and improve the redox properties by the redox cycle (Ni3+ + Mn2+ <-> Ni2+ + Mn4+). Thus, the amount of the reaction intermediates is improved, and the reactivities between CxHyOz species and nitrite/nitrate species are promoted. Furthermore, in the presence of SO2, the MnNiAlO samples can give rise to minor formation of sulfate and inhibit the competitive adsorption effectively due to their nitrite/nitrate species being more abundant and stable. Finally, regeneration was studied using in situ FTIR and the water washing method showed the best performance on the regeneration of S-poisoned catalysts.
机译：在SO 2存在下，在一系列MN促进的煅烧尼亚水滑石上研究了在SO2存在下进行丙烯（C3H6-SCR）的选择性催化还原。所得5％甘尼催化剂在240℃下表现出优于转化效率（95％），优异的硫中毒性。根据几种表征测量提出了催化过程的可能反应途径。证明Mn-Prodaled Nialo催化剂增强了铜酸盐位点和表面活性氧基团，并通过氧化还原循环（Ni3 + + + Mn 2 + - > Ni2 ++ Mn4 +）改善氧化还原性能。因此，改善了反应中间体的量，促进了Cxhyoz物种和亚硝酸盐/硝酸盐物质之间的反应。此外，在SO2的存在下，Mnnialo样品可以产生硫酸盐的次要形成，并且由于其亚硝酸盐/硝酸盐物种更丰富和稳定而有效地抑制竞争吸附。最后，使用原位FTIR进行再生，水洗方法显示出S毒理催化剂再生的最佳性能。

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  • 来源
    《RSC Advances》 |2020年第7期|共10页
  • 作者

    Zhao Ling; Kang Mengdi;

  • 作者单位

    Inner Mongolia Univ Sch Ecol &

    Environm Hohhot Peoples R China;

    Inner Mongolia Univ Sch Ecol &

    Environm Hohhot Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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