Department of Chemistry
One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation
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. © 2013 Elsevier B.V. All rights reserved.
Catalyst, Knoevenagel condensation, MgAl oxides, Solid superbase
Source Publication Title
Applied Catalysis A: General
Link to Publisher's Edition
Zhao, J., Xie, J., Au, C., & Yin, S. (2013). One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation. Applied Catalysis A: General, 467, 33-37. https://doi.org/10.1016/j.apcata.2013.06.054