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Multifunctional hydrotalcite-derived K/MnMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot-NOx removal
Li, Q; Meng, M; Dai, FF; Zha, YQ; Xie, YN; Hu, TD; Zhang, J; Xie YN(谢亚宁); Hu TD(胡天斗); Zhang J(张静)
2012
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume184Pages:106-112
AbstractA series of hydrotalcite-derived K/MnMgAlO catalysts were synthesized by co-precipitation and impregnation methods. Their catalytic performances for soot combustion, NOx storage and simultaneous soot-NOx removal were evaluated, respectively. Techniques of TG/DTA, BET, XRD, EXAFS, and in situ DRIFTS were employed for catalyst characterization. The catalyst K/Mn1.5Mg1.5AlO containing 7.5 wt% K shows not only the highest soot oxidation rate of 58.0 mu gs(-1) per gram catalyst, but also the maximal NOx reduction percentage of 26.9%. Over the catalysts containing K less than 10 wt%, the soot combustion follows oxygen spillover mechanism, while over those containing more than 10 wt% K it follows a different mechanism involving the participation of potassium nitrate species. In situ DRIFTS results indicate that introduction of proper amount of K can facilitate the formation of monodentate nitrate, which shows higher reactivity with soot than nitrite, chelating bidentate nitrate and ionic nitrate species. In the catalysts promoted by K, a new phase namely K2Mn4O8 was identified, which is highly active for soot combustion and NOx reduction by soot. (C) 2012 Elsevier B.V. All rights reserved.
KeywordHydrotalcite Soot combustion NOx storage NOx reduction Mechanism
Subject AreaEngineering
DOI10.1016/j.cej.2012.01.009
Indexed BySCI
WOS IDWOS:000301908100013
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/223845
Collection多学科研究中心
Recommended Citation
GB/T 7714
Li, Q,Meng, M,Dai, FF,et al. Multifunctional hydrotalcite-derived K/MnMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot-NOx removal[J]. CHEMICAL ENGINEERING JOURNAL,2012,184:106-112.
APA Li, Q.,Meng, M.,Dai, FF.,Zha, YQ.,Xie, YN.,...&张静.(2012).Multifunctional hydrotalcite-derived K/MnMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot-NOx removal.CHEMICAL ENGINEERING JOURNAL,184,106-112.
MLA Li, Q,et al."Multifunctional hydrotalcite-derived K/MnMgAlO catalysts used for soot combustion, NOx storage and simultaneous soot-NOx removal".CHEMICAL ENGINEERING JOURNAL 184(2012):106-112.
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