The Lewis acidity is due to AI3+ and Fe3+ at the crystal edges, and can be further enhanced by exchange of the interlayer cations Na+ and Ca2+ by AP+ ions on treating the clay with AICl3 solution.
The Lewis acidityis due to AI3+ and Fe3+ at the crystal edges, and can be furtherenhanced by exchange of the interlayer cations Na+ and Ca2+ byAP+ ions on treating the clay with AICl3 solution.