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Selective oxidation of styrene over Mg–Co–Al hydrotalcite like-catalysts using air as oxidant

Paper ID Volume ID Publish Year Pages File Format Full-Text
49760 46764 2014 5 PDF Available
Title
Selective oxidation of styrene over Mg–Co–Al hydrotalcite like-catalysts using air as oxidant
Abstract

•The successful substitution of Mg2 + by Co2 + in Mg/Al hydrotalcite•Co2 + in hydrotalcite is essential for the epoxidation of styrene.•A good activity in the styrene oxidation under mild condition•A higher selectivity to epoxide styrene over the cobalt-richer hydrotalcite

A set of synthesized Mg/Co/Al hydrotalcites was synthesized and characterized by XRD, XPS, BET, SEM, TEM, and FT-IR physical techniques. The partial substitution of Mg2 + by Co2 + in brucite layers has not significantly affected the layered double hydroxide structure, but plays a crucial role in the oxidation of styrene in the presence of air. The prepared Mg/Co/Al hydrotalcite-like compounds express a good activity and stability in the oxidation of styrene in the free-solvent condition. Both styrene conversion and desired product selectivities are strongly dependent on the cobalt substitution content. The intra-hydrotalcite lattice Co2 + ions are active sites for the epoxidation of styrene.

Graphical abstractA strong correlation between catalytic activity in the oxidation of styrene and Co2 + in brucite-like layers of layered double hydroxides (other products: phenyl acetaldehyde, benzoic acid, styrene glycol, benzyl benzoate, and polymerized products).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Metal-doped hydrotalcite; Styrene oxidation; Benzaldehyde; Epoxide; Mg–Co–Al
First Page Preview
Selective oxidation of styrene over Mg–Co–Al hydrotalcite like-catalysts using air as oxidant
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 45, 5 February 2014, Pages 153–157
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis