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Effect of Fe content on physical properties of BaO–CeOx–FeOy catalysts for direct NO decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
47054 46457 2011 7 PDF Available
Title
Effect of Fe content on physical properties of BaO–CeOx–FeOy catalysts for direct NO decomposition
Abstract

The physical properties of the Ba-loaded Ce–Fe mixed oxide catalysts, which exhibited high activity for NO decomposition to N2, were investigated. The optimum Fe/(Ce + Fe) molar ratio was 0.02. The X-ray absorption near edge structure, electron spin resonance, and diffuse reflectance UV–vis spectra indicated that the optimum catalyst had the highest proportion of isolated tetrahedral Fe3+ ions in all the Fe species. Raman spectra suggested that incorporation of Fe3+ in the fluorite structure of CeO2 caused an increase in the concentration of oxygen vacancies, which play an important role in the NO decomposition activity of the catalysts. Temperature-programmed desorption (TPD) of O2 showed that the addition of the Fe component to BaO/CeO2 enhanced O2 uptakes and facilitated oxygen desorption. NO-TPD profiles showed that NO desorption was associated with the desorption of O2, indicating that these two species are formed by decomposition of surface nitrate species.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CeO2–Fe2O3 solid solutions with the CeO2 cubic fluorite structure are formed. ► Local structure of iron had a tetrahedral coordination environment. ► Incorporation of Fe3+ in fluorite structure causes the formation of oxygen vacancies. ► Oxygen vacancies play important roles in the NO decomposition activity.

Keywords
Ce–Fe mixed oxide; Oxygen vacancy; O2-TPD; NO-TPD; NO decomposition
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Effect of Fe content on physical properties of BaO–CeOx–FeOy catalysts for direct NO decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 1–2, 21 July 2011, Pages 142–148
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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