NO adsorption behaviors of the MnOx catalysts in lean-burn atmospheres
Guo, L; Xian, H; Li, QF; Chen, D; Tan, YS; Zhang, J; Zheng, LR; Li, XG;张静; Zheng LR(郑黎荣)
AbstractNOx emission control of lean-burn engines is one of the great challenges in the world. Herein, the MnOx model catalysts with the different calcination temperatures were synthesized to investigate their NO adsorbability for lean-burn exhausts. The transformation from (beta-)MnO2 to (alpha-)Mn2O3 following the increased calcination temperatures was evidenced from the viewpoint of the local atomic level. Among these samples, the one calcined at 550 degrees C containing the single alpha-Mn2O3 phase displayed the best NO adsorbability: NO was mainly adsorbed in the forms of NO/nitrites and NO2/nitrates at the low and high temperatures, respectively; the NO oxidation ability displayed the volcano-shape following the increased operating temperatures, and reached the maximum, i.e. 92.4% of the NO-to-NO2 conversion, at 250 degrees C. Moreover, this sample presented the efficiently reversible NO adsorption/desorption performance in alternative lean-burn/fuel-rich atmospheres, due to the weakly bonded NO on it. The superficial oxygen species plays a critical role for the NO oxidation over alpha-Mn2O3. The consumed superficial oxygen could be further compensated by the gaseous and lattice oxygen therein. Our findings show that the alpha-Mn2O3 material is a promising NOx adsorber for lean-burn exhausts even at low operating temperatures. (C) 2013 Elsevier B.V. All rights reserved.
KeywordManganese oxides Nitrogen oxides Adsorption Lean-burn Desorption
Subject AreaEngineering; Environmental Sciences & Ecology
Indexed BySCI
WOS IDWOS:000324563500066
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Guo, L,Xian, H,Li, QF,et al. NO adsorption behaviors of the MnOx catalysts in lean-burn atmospheres[J]. JOURNAL OF HAZARDOUS MATERIALS,2013,260:543-551.
APA Guo, L.,Xian, H.,Li, QF.,Chen, D.,Tan, YS.,...&郑黎荣.(2013).NO adsorption behaviors of the MnOx catalysts in lean-burn atmospheres.JOURNAL OF HAZARDOUS MATERIALS,260,543-551.
MLA Guo, L,et al."NO adsorption behaviors of the MnOx catalysts in lean-burn atmospheres".JOURNAL OF HAZARDOUS MATERIALS 260(2013):543-551.
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