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
Zhao, Jin, Jun Xie, Chak-Tong Au, and Shuang-Feng Yin. "One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation." Applied Catalysis A: General 467 (2013): 33-37.