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Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
48664 46517 2006 6 PDF Available
Title
Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation
Abstract

The influence of low loadings of MnOx on the catalytic activity for n-hexene and CO oxidation over highly dispersed Pt on alumina catalysts has been investigated. The applied deposition–precipitation method allows Mn to be deposited on the Pt containing egg-shell volume. The catalyst samples were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and selective CO chemisorption. Platinum influences the dispersion of deposited MnOx. The dispersion of the MnOx phase is higher on Pt containing samples than on Al2O3. The Pt decoration by Mn is reflected by a low CO uptake and the Pt oxidation state (Pt2+). The addition of Mn lowers the catalytic activity for CO oxidation. This is attributed to a change of the Pt sites such that adsorption of CO is less favorable. The activity of the catalysts in the oxidation of n-hexane showed a significant improvement with addition of MnOx. A light-off shift by about 40 °C was observed. This improvement is attributed to the formation of Mn–Pt oxide like species that primarily weakens the Pt–O bond.

Keywords
Pt/Al2O3 catalyst; Manganese oxide; Deep oxidation; n-Hexane; CO
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Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 64, Issues 1–2, 18 April 2006, Pages 51–56
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
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100% Money Back Guarantee
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