Abstract
Mesostructured intercalates belonging to the class of solid acids known as porous clay heterostructures (PCH) have been prepared through the surfactant-directed assembly of mesoporous silica within the galleries of synthetic saponite clays with targeted layer charge densities in the range x = 1.2−1.7 e- units per Q+x[Mg6](Si8-xAlx)O20(OH)4 unit cell. The removal of the intragallery mixture of neutral alkylamine and quaternary ammonium ion surfactant (Q+) by calcination afforded PCH intercalates with basal spacings of 33−35 A, BET specific surface areas of 800−920 m2 g-1, and pore volumes of 0.38−0.44 cm3 g-1. The framework pore sizes were in the supermicropore to small mesopore region ∼15−23 A. Temperature-programmed desorption of chemisorbed cyclohexylamine (CHA) indicated the presence of both weak and strong acid sites, corresponding to desorption temperatures near 220 and 410 °C, respectively. The total acidity (0.64−0.77 mmol CHA g-1) increased with the saponite layer charge density (x), indicating th...
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