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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 (C _(3) H _(6) -SCR) in the presence of SO _(2) 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 °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 Br?nsted acid sites and surface active oxygen groups, and improve the redox properties by the redox cycle (Ni ~(3+) + Mn ~(2+) ? Ni ~(2+) + Mn ~(4+) ). Thus, the amount of the reaction intermediates is improved, and the reactivities between C _( x ) H _( y ) O _( z ) species and nitrite/nitrate species are promoted. Furthermore, in the presence of SO _(2) , 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：在存在SO _（2）的情况下，在一系列MN促进的煅烧尼亚水滑石上研究了在存在下存在的丙烯（C _（3）H _（6）-SCR）的选择性催化还原。所得5％Mnnialo催化剂在240℃下表现出优异的转化效率（95％），并且优异的硫中毒抗性。根据几种表征测量提出了催化过程的可能反应途径。结果表明，Mn-Prodaled Nialo催化剂增强了Brα的Nsted酸位点和表面活性氧基，并通过氧化还原循环（Ni〜（3+）+ Mn〜（2+）〜（2 +）+ Mn〜（4+））。因此，改善了反应中间体的量，促进了C _（x）H _（y）o o _（z）物种和亚硝酸盐/硝酸盐物种之间的反应。此外，在如此_（2）存在下，Mnnialo样品可以引起硫酸盐的次要形成，并且由于它们的亚硝酸盐/硝酸盐物种具有更丰富和稳定而抑制竞争吸附。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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