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Understanding the role of redox properties and NO adsorption over MnFeOx for NH3-SCR

机译：了解NH3-SCR的氧化还原性质和无吸附的作用

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摘要

Widening the operational temperature window of the selective catalytic reduction of NO by NH3 (NH3-SCR) is a challenge to meet the increasingly stringent emission control regulations for NOx. Hence, MnFeOx with different molar ratios were prepared and investigated for NH3-SCR. Mn–Fe-0.2 (Mn/Fe molar ratio of 0.2) eliminates more than 80% of NOx in the temperature range of 50 to 360 °C with a N2 selectivity of higher than 90%. In addition, it also presents excellent SO2/H2O tolerance. Doping Mn not only inhibits the phase transformation of iron oxide (Fe2O3) but also strengthens the interaction between MnOx and Fe2O3 due to the electron transfer between them, which leads to the formation of Mn–O–Fe. Meanwhile, the amounts of acid, redox properties, and NO adsorption could also be tuned. The generation of different types of nitrite/nitrate is dependent on the redox properties and NO adsorption strength, whereas the activity of nitrite/nitrate functions in a different reaction temperature zone. Therefore, tuning for moderate redox activity and the NO adsorption strength will help to extend the operational temperature window.
机译：扩大NH3（NH3-SCR）选择性催化降低NO的操作温度窗口是满足NOX日益严格的排放控制法规的挑战。因此，制备具有不同摩尔比的MNFEOX并研究了NH3-SCR。 MN – FE-0.2（MN/Fe摩尔比为0.2）在50至360°C的温度范围内消除了80％以上的NOX，N2选择性高于90％。此外，它还具有出色的SO2/H2O公差。掺杂MN不仅抑制了氧化铁（FE2O3）的相变，而且还可以增强MNOX与Fe2O3之间的相互作用，因为它们之间的电子转移，从而导致MN – O -FE的形成。同时，也可以调整酸，氧化还原性能和无吸附的量。不同类型的亚硝酸盐/硝酸盐的产生取决于氧化还原特性和没有吸附强度，而亚硝酸盐/硝酸盐在不同的反应温度区域的活性。因此，调整中等氧化还原活性和无吸附强度将有助于扩展操作温度窗口。

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