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Influence of partial Mn-substitution on surface oxygen species of LaCoO3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55103 47040 2013 5 PDF Available
Title
Influence of partial Mn-substitution on surface oxygen species of LaCoO3 catalysts
Abstract

A series of LaCo1−xMnxO3 (x = 0.05, 0.1, 0.3, 0.5, 0.7) perovskite-type catalysts were prepared by citric acid sol–gel method to study the influence of partial Mn-substitution on the catalytic performance and surface oxygen species of LaCoO3 perovskite-type catalysts. Their catalytic performances for particulate matters (PM) oxidation were investigated by a technique of temperature-programmed oxidation reaction (TPO), indicating that the catalytic performance of LaCo0.95Mn0.05O3 is better. The catalysts were characterized by XRD, BET, IR, H2-TPR, O2-TPD and XPS. The results show that LaCo1−xMnxO3 catalysts have perovskite-type structures after partially substituted by Mn. There are three kinds of oxygen species, lattice oxygen ion O2−, peroxide ion O− and superoxide ion O2−, are present on the surfaces of catalysts. The content of surface oxygen species varies with Mn-substitution amount. Superoxide ion O2− and surface oxygen vacancy play an important role in the reaction of PM oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (80 K)Download as PowerPoint slideHighlights► A small amount of Mn-substitution promotes PM oxidation. ► There are three kinds of surface oxygen species on the surface of the catalysts. ► Mn-substitution amounts affect the contents of lattice oxygen ion and superoxide ion. ► Superoxide ion and oxygen vacancy play role in the reaction of PM oxidation.

Keywords
LaCoO3; Surface oxygen species; Particulate matters; Partial substitution
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Influence of partial Mn-substitution on surface oxygen species of LaCoO3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 98–102
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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