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Highly active Ga promoted Co-HMS-X catalyst towards styrene epoxidation reaction using molecular O2

Paper ID Volume ID Publish Year Pages File Format Full-Text
39584 45828 2014 8 PDF Available
Title
Highly active Ga promoted Co-HMS-X catalyst towards styrene epoxidation reaction using molecular O2
Abstract

•Co-HMS-X catalyst showed catalytic activity for direct styrene epoxidation reaction.•Al, Ga and Tl (0.25 mol%) are used as promoters in Co-HMS-X catalyst.•The highly active Ga-Co-HMS-X (Co/Ga = 4) had large number of acidic sites.•The catalyst is stable up to three cycles.•It could epoxide cyclooctene with reasonably good conversion.

Atom efficient synthesis of various value added products has been focused as an intense research area after Kyoto protocol. Styrene epoxidation is a challenging reaction as styrene epoxide is an important monomer for large number of polymers. It has been found that surface acidity and redox property of the catalyst has a major contribution to the catalytic activity for oxidation reaction. In this study Co-HMS-X catalyst was prepared and characterized by BET surface area and porosity measurement, SAXS, SANS, FESEM, HRTEM, UV–vis spectra, FTIR, 29Si NMR, H2-TPR and NH3-TPD techniques. It is observed that 5 mol% Co-HMS-X showed highest catalytic activity for styrene epoxidation reaction using molecular O2 as an oxidant. Interestingly it is found that among three different dopant (Al, Ga, Tl), the Ga promoted Co-HMS-X catalyst (Si:Co:Ga = 100:5:1.25) showed highest catalytic activity in terms of styrene conversion (100%) and styrene epoxide selectivity (68%). The unusual trend of Al, Ga and Tl towards the activity of Co-HMS-X (5 mol%) catalyst has been discussed from the results obtained in the H2-TPR and NH3-TPD study.

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Keywords
Mesoporous silica; Cobalt; Molecular oxygen; Epoxidation; Promoter; Gallium
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Highly active Ga promoted Co-HMS-X catalyst towards styrene epoxidation reaction using molecular O2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 482, 22 July 2014, Pages 61–68
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