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首页> 外文期刊>Catalysis science & technology >Identifying the descriptor governing NO oxidation on mullite Sm(Y, Tb, Gd, Lu)Mn2O5 for diesel exhaust cleaning
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Identifying the descriptor governing NO oxidation on mullite Sm(Y, Tb, Gd, Lu)Mn2O5 for diesel exhaust cleaning

机译：标识符管理不氧化莫来石Sm (Y,结核病,Gd, Lu) Mn2O5柴油废气净化

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摘要

The current fast selective catalytic reduction (fast-SCR) technology shows effectiveness in converting diesel engine generated nitrogen oxides (NOx) to environmentally benign nitrogen (N-2) with the aid of the precious metal catalyst platinum. Driven by the previous finding of the low-cost mullite's great superiority over Pt in terms of NO oxidation, a series of Mn-based oxides Sm(Y, Tb, Gd, Lu)Mn2O5 are synthesized to identify a general descriptor that governs the catalytic performance. Utilizing soft X-ray absorption characterization and molecular orbital theory, here, we show that the catalytic activity difference presents little dependence on the 3d electron occupancy when the A site element is varied (Sm, Tb, Y, Gd, Lu). Instead, strong p-d hybridization between lattice O and octahedral Mn leads to weak bonding strength between external O* and pyramid Mn and essentially increases the catalytic activity for converting NO to NO2.
机译：当前快速选择性催化还原(fast-SCR)技术显示效果将柴油机产生的氮氮氧化物(NOx)环保氮(2)借助贵金属催化剂白金。低成本的莫来石的优势在Pt没有氧化,一系列的锰基氧化物Sm (Y,结核病、Gd Lu) Mn2O5合成确定一个通用描述符管理催化性能。吸收特性和分子轨道理论,在这里,我们表明,催化活性差异提出了对3 d的依赖电子网站元素时占用不同(Sm,结核病,Y, Gd Lu)。晶格O和八面体锰之间的杂交导致疲软的外部之间的结合强度O *和金字塔Mn实际上增加了没有转化为NO2的催化活性。

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