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Fluorine-modified Mg–Al mixed oxides: A solid base with variable basic sites and tunable basicity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42347 45921 2010 7 PDF Available
Title
Fluorine-modified Mg–Al mixed oxides: A solid base with variable basic sites and tunable basicity
Abstract

The fluorine-modified Mg–Al mixed oxides were synthesized by thermal decomposition of the fluorine-containing Mg–Al hydrotalcites, and their physicochemical properties were characterized by ICP, TGA, XRD, FTIR, CO2-TPD and N2 adsorption/desorption techniques. It was found that weak basic sites were gradually transformed into moderate and strong basic sites during thermal decomposition, and thus weak basic sites (OH− groups), moderate basic sites (Mg–O, Mg–F and Al–O pairs) and strong basic sites (coordinatively unsaturated F− and O2− ions) were all produced in the as-prepared samples. Furthermore, the basicity of moderate basic sites could be controlled by the change of fluorine content, which caused the change in the amounts of Mg–F pairs. In the synthesis of propylene glycol methyl ether from methanol and propylene oxide, the base-catalytic performance of the obtained samples was shown to be closely associated with their moderate basic sites.

Graphical abstractSome fluorine-modified Mg–Al mixed oxides could be prepared by thermal decomposition of the fluorine-containing Mg–Al hydrotalcite. The weak, moderate and strong basic sites were all produced in the as-prepared samples. Moreover, the amount of basic sites could be controlled by the changes of decomposition temperature and fluorine content.Figure optionsDownload full-size imageDownload high-quality image (96 K)Download as PowerPoint slide

Keywords
Hydrotalcite; Mg–Al mixed oxides; Fluorine; Tunable basicity; Propylene oxide; Methanol
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Fluorine-modified Mg–Al mixed oxides: A solid base with variable basic sites and tunable basicity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 377, Issues 1–2, 1 April 2010, Pages 107–113
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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