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Catalytic activity of Pt catalysts promoted by MnOx for n-hexane oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46889 46452 2011 6 PDF Available
Title
Catalytic activity of Pt catalysts promoted by MnOx for n-hexane oxidation
Abstract

The deep oxidation of n-hexane was studied over Pt catalysts with small and large Pt crystallites, promoted by MnOx. The Mn was deposited on the Pt/Al2O3 by deposition-precipitation method using two alkalis, ammonia and dimethylamine. The strength of the base influenced morphology and performances of Mn-Pt catalysts. Ammonia formed mostly spherical structure of manganese oxide, while dimethylamine created fibrous needle-like shape of MnOx, typical for cryptomelane phase of manganese oxide. This was confirmed by XPS results that show an oxidation state of Mn close to that for cryptomelane. The Pt-Mn catalysts were more active than catalysts containing Pt only. Promoting effect of MnOx is more pronounced for larger Pt crystallites. Among Pt-Mn samples, catalysts synthesized with dimethylamine exhibited the highest activities. Mobility and reactivity of oxygen from Pt–O–Mn sites associated with cryptomelane phase may be responsible for increased activity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A convenient and effective deposition-precipitation method has been applied to prepare novel Mn-Pt catalysts. ► Ammonia and dimethylamine have been used as reagents for decoration of small and large Pt crystallite by Mn. ► Order of catalysts activity in n-hexane oxidation is Pt-Mn (D) > Pt-Mn (A) > Pt. ► The improvement of the catalytic activity have been attributed to the nature of MnOx phase that is bonded with Pt.

Keywords
Pt/Al2O3 catalyst; Manganese oxide; Deep oxidation; n-Hexane; Promoting effect
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Catalytic activity of Pt catalysts promoted by MnOx for n-hexane oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 107, Issues 3–4, 21 September 2011, Pages 327–332
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