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首页> 外文期刊>RSC Advances >Mechanistic study of selective catalytic reduction of NO with NH3 over highly dispersed Fe2O3 loaded on Fe-ZSM-5
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Mechanistic study of selective catalytic reduction of NO with NH3 over highly dispersed Fe2O3 loaded on Fe-ZSM-5

机译：在Fe-ZSM-5上加入高度分散的Fe2O3的NH3选择性催化还原NO选择性催化还原的机械研究

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摘要

ZSM-5 supported highly dispersed Fe _( x ) O _( y ) clusters were prepared by a sol–gel method for selective catalytic reduction (SCR) of NO with NH _(3) . XRD, SEM, UV-vis, H _(2) -temperature-programmed reduction (H _(2) -TPR), NH _(3) -temperature-programmed desorption (NH _(3) -TPD), and BET analyses all indicated that Fe species mainly existed as highly dispersed surface Fe _( x ) O _( y ) clusters with a Fe ~(3+) concentration of 22 wt%. NO-temperature-programmed oxidation (NO-TPO) revealed that the Fe _( x ) O _( y ) clusters promoted the oxidation of NO to NO _(2) , which promoted the low temperature NO _( X ) removal. NH _(3) was activated above 250 °C and over-oxidation of NH _(3) to NO _( X ) was not observed, as a result, a NO _( X ) removal efficiency of 91% was achieved at 400 °C. Moreover, the SCR reaction route was found to be temperature dependent, below 200 °C, the NO _( X ) reduction followed the reaction between NO _(2) and non-activated NH _(3) . Fast SCR reaction dominated the NO _( X ) removal in the temperature window of 200–325 °C. At temperatures above 250 °C, the normal reaction between activated NH _(3) and NO compensated the thermodynamic limitation induced suppression of fast SCR.
机译：ZSM-5支持高度分散的Fe _（X）O _（Y）簇通过溶胶 - 凝胶法制备用于选择性催化还原（SCR）的NH _（3）。 XRD，SEM，UV-VI，H _（2） - 编程减小（H _（2）-TPR），NH _（3） - 编程 - 编程解吸（NH _（3）-TPD）和下注分析表明Fe种主要存在于具有22wt％的Fe〜（3+）浓度的Fe〜（3+）浓度的高度分散的表面Fe _（x）o_（y）簇。无温度编程的氧化（NO-TPO）显示Fe _（x）O _（Y）簇促进NO至NO _（2）的氧化，该氧化物促进低温NO _（X）去除。 NH _（3）以高于250℃，并未观察到NH _（3）至No _（X）的过氧化，结果，在400时实现了91％的NO _（x）去除效率°C。此外，发现SCR反应途径为温度依赖性，低于200℃，否_（x）还原遵循NO _（2）和非活化NH _（3）之间的反应。快速SCR反应在200-325°C的温度窗口中占据了NO _（x）的去除。在高于250℃的温度下，活性NH _（3）之间的正常反应，没有补偿热力学限制诱导的快速舒缓抑制。

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