Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 134, Issue -, Pages 251-257Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2013.01.027
Keywords
NO oxidation; Mn4+/Mn3+ ratio; Nonstoichiometry; LaMnO3 perovskite
Funding
- GM Global Research Development [RD-07-312-NV487]
- National High Technology Research and Development Program of China (863 Program) [2011AA03A405]
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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 H-2-TPR. La0.9MnO3 sample exhibits superior activity, and a 50% NO conversion at 250 degrees 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. (C) 2013 Elsevier B.V. All rights reserved.
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