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Phase structures, morphologies, and NO catalytic oxidation activities of single-phase MnO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
38938 45798 2016 11 PDF Available
Title
Phase structures, morphologies, and NO catalytic oxidation activities of single-phase MnO2 catalysts
Abstract

•γ-MnO2 showed superior NO oxidation activity in comparison to α-, β- and δ-MnO2.•γ-MnO2 had a special random-tunnel structure which easily created structural faults.•The structural faults in γ-MnO2 facilitated the adsorption and activation of NO and O2.

The NO catalytic oxidation activities of single-phase α-, β-, γ-, and δ-MnO2 were investigated. All the catalysts were systematically characterized using various techniques. The results showed that the catalytic activities were significantly affected by the MnO2 phase structures. Among the four catalysts, the urchin-like γ-MnO2 showed the best NO catalytic oxidation activity across the studied temperature range, with the largest NO conversion, namely 88%, at 280 °C. This is good activity, even compared with those of noble-metal-based catalysts. It also displayed the best activity during long reaction times. The NO catalytic oxidation activities of the other three catalysts decreased in the order α- > β- > δ-MnO2. The various phase structures of MnO2 contain the same [MnO6] octahedral units, but with different linking modes. γ-MnO2 has a disordered structure, resulting in larger numbers of active oxygen species, leading to a better catalytic performance.

Graphical abstractγ-MnO2 displayed the best NO catalytic oxidation activity, especially in the low temperature range. The large specific surface area and pore volume of the γ-MnO2 were supposed to have beneficial effect, besides, the active oxygen in the γ-MnO2 resulted from the random structure of γ-MnO2 was also responsible for the superior activity.Figure optionsDownload full-size imageDownload high-quality image (113 K)Download as PowerPoint slide

Keywords
Single-phase MnO2; NO catalytic oxidation; Tunnel structure; Morphology; Activated oxygen
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Phase structures, morphologies, and NO catalytic oxidation activities of single-phase MnO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 514, 25 March 2016, Pages 24–34
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us