The influence of nonstoichiometry on LaMnO3 perovskite for catalytic NO oxidation

CHEN Jiahao; SHEN Meiqing; WANG Xinquan; WANG Jun

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The influence of nonstoichiometry on LaMnO3 perovskite for catalytic NO oxidation

CHEN Jiahao 1 #,SHEN Meiqing 2 *,WANG Xinquan 3,WANG Jun 2

1.Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, TianJin 300072

2.Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China

3. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, PR China

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.20090032110020）

Opened online:18 December 2012

Accepted by: none

Citation: CHEN Jiahao,SHEN Meiqing,WANG Xinquan.The influence of nonstoichiometry on LaMnO3 perovskite for catalytic NO oxidation[OL]. [18 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4500817

A series of structural modified LaxMnO3 (x = 0.9, 0.95, 1, 1.05, 1.11) perovskites used for NO oxidation was synthesized by a sol-gel method and characterized by XRD, BET, XPS, EPR and H2-TPR. La0.9MnO3 sample exhibits superior activity, and a 50% NO conversion at 250 C is obtained. XPS and EPR results reveal a higher Mn4+/Mn3+ ratio in Mn-rich samples, which induce more active oxygen bonding to Mn4+ due to the need for balancing the chemical states and stabilizing the structure. Easily regenerated oxygen associated with Mn4+ catalyzes the low-temperature NO oxidation. The constant activation energy (44.8 kJ/mol) obtained in the kinetics tests indicates the same mechanism of NO oxidation operated on all the samples.

Keywords:NO oxidation; Mn4+/Mn3+ ratio; Nonstoichiometry; LaMnO3 perovskite

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