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Synthesis and characterization of cobalt-substituted SBA-15 and its high activity in epoxidation of styrene with molecular oxygen

Paper ID Volume ID Publish Year Pages File Format Full-Text
47079 46458 2010 9 PDF Available
Title
Synthesis and characterization of cobalt-substituted SBA-15 and its high activity in epoxidation of styrene with molecular oxygen
Abstract

Cobalt-substituted SBA-15 (Co-SBA-15x) was successfully synthesized by a simple and effective method designated as “pH-adjusting”. Based on series of characterizations, the material still retained a highly ordered mesostructure of SBA-15 when a certain amount of cobalt was introduced. The cobalt species in Co-SBA-15x mainly existed in the single-site Co(II) state. Most of them were incorporated into the silica framework of SBA-15, locating at tetrahedrally coordinated sites. For epoxidation of styrene with O2, Co-SBA-15x exhibited the highest catalytic activity among the cobalt-based catalysts prepared by different method with the same cobalt content, and the single-site Co(II) in Co-SBA-15x was the most active in the reaction. The influences of reaction conditions such as reaction temperature, catalyst amount, solvent, solvent amount, reaction time, oxidant, and oxidant amount on the performance of Co-SBA-15x were also investigated in detail. Co-SBA-15x possessed excellent stability and recyclability in the reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Highly ordered Co-SBA-15 was successfully synthesized by a pH-adjusting method. ▶ Highly dispersed cobalt was mainly in the single-site Co(II) state. ▶ Cobalt was largely incorporated into the framework, in tetrahedral coordination. ▶ Co-SBA-15 showed high activity in epoxidation of styrene with O2. ▶ Co-SBA-15 possessed excellent stability and recyclability in the reaction.

Keywords
Cobalt; SBA-15; Epoxidation; Styrene; Molecular oxygen
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Synthesis and characterization of cobalt-substituted SBA-15 and its high activity in epoxidation of styrene with molecular oxygen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 101, Issues 1–2, 22 November 2010, Pages 45–53
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