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Activity of MnOx–CeO2 catalysts in combustion of low concentrated methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
53589 46975 2015 5 PDF Available
Title
Activity of MnOx–CeO2 catalysts in combustion of low concentrated methane
Abstract

•The studied MnOx–CeO2 binary oxides show satisfactory activity in lean CH4 combustion.•Structural heterogeneity of MnOx forms was revealed as a function of MnO2 loading.•A link between catalytic activity, surface heterogeneity, and reducibility was established.•A passage between oxidation states of Mn is vital for efficient catalytic performance.

Due to its warming potential over 20 times higher than that of CO2, methane is classified as one of the most dangerous pollutants. Removal of methane emitted particularly from low calorific sources, such as coal mine ventilation air streams or dumping grounds, falls thus in line with the most important challenges of environmental catalysis. Main goal of this work was to verify the efficiency and to understand the catalytic behavior of a series of coprecipitated MnOx–CeO2 mixed oxide samples, containing nominally 30–80 mol% of MnO2. A plethora of structural (XRD, RS), textural (BET), and spectroscopic (EPR, XPS, and RS) methods have been applied for sample characterization. Catalytic activity has been determined by TPSR in the temperature range from 100 to 700 C. It was shown that catalytic activity of the investigated MnOx–CeO2 samples is strongly related to their structural heterogeneity and reducibility of various manganese centers coexisting within the surface MnOx clusters interacting with nanocrystalline CeO2.

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Keywords
MnOx–CeO2 binary oxides; Environmental catalysis; Lean methane combustion; Structural and spectroscopic characterization; Heterogeneity; Reducibility
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Activity of MnOx–CeO2 catalysts in combustion of low concentrated methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 257, Part 1, 15 November 2015, Pages 131–135
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
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