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Effect of alkali metal promoters on natural manganese ore catalysts for the complete catalytic oxidation of o-xylene

Paper ID Volume ID Publish Year Pages File Format Full-Text
55741 47063 2011 6 PDF Available
Title
Effect of alkali metal promoters on natural manganese ore catalysts for the complete catalytic oxidation of o-xylene
Abstract

A series of alkali metal doped natural manganese ore (NMO) catalysts were prepared by an impregnation method, and tested for the complete catalytic oxidation of o-xylene. The effects of alkali metal on the catalytic performance and structural properties of NMO were examined. Alkali metals were found to enhance the activity of NMO in the following order: Li < Na < Rb < K, Cs. The experimental results showed that NMO-K(Cs)-0.07 could convert o-xylene (0.055 vol.%) into CO2 and H2O at 240 °C, which was 60 °C lower than that of NMO. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) measurements revealed that the primary component of NMO and NMO-K-0.07 were MnO2. It was found that K2O was highly dispersed onto the NMO surface. The addition of K2O did not increase the BET surface area of the NMO. However, it resulted in the binding energy of the Mn 2p of NMO-K-0.07 shifted to a lower value. The results suggested that alkali metals act as electronic promoters, indicating that alkali metal doped NMO are promising catalyst candidates for the catalytic oxidation of VOCs.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (116 K)Download as PowerPoint slideHighlights► A positive effect of alkali metal doping were observed in natural manganese ore (NMO). ► As electronic promoters, alkali promoters improve the reducibility of Mn ions. ► Alkali metals enhance the activity of NMO in this order: Li < Na < Rb < K, Cs. ► NMO-K(Cs)-0.07 could convert o-xylene (0.055 vol.%) into CO2 and H2O at 240 °C.

Keywords
Alkali metal; Natural manganese ore; o-Xylene; Complete catalytic oxidation
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Effect of alkali metal promoters on natural manganese ore catalysts for the complete catalytic oxidation of o-xylene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 196–201
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
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