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One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40032 45843 2013 5 PDF Available
Title
One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation
Abstract

•Potassium-loaded MgAl oxides were synthesized by one-pot process.•The materials show superbasicity.•The materials show high catalytic activity in Knoevenagel condensation.•It opens up a new route for design of superbases using mixed oxides as supports.

We report a new strategy for one-pot synthesis of potassium-loaded MgAl oxides using KOH to adjust the pH value of the reaction system. The as-prepared solid superbases were studied by N2 physisorption method, energy-dispersive X-ray spectroscopy, powder X-ray diffraction, and Fourier transform infrared. The superbasic sites were characterized by the use of Hammett indicators and CO2 temperature-programmed desorption. We found that with a base strength (H–) above 26.5, the potassium-loaded MgAl oxides showed high catalytic activity for Knoevenagel condensation at room temperature. Furthermore, the higher the superbasicity and/or the more the amount of superbasic sites, the better is the catalytic activity. The findings open up a new route for the synthesis of new functional superbases using composite oxides as supports.

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Keywords
Solid superbase; MgAl oxides; Catalyst; Knoevenagel condensation
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One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 467, 2 October 2013, Pages 33–37
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
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