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Abstract
The layered precursor of zeolite MCM-22 was pillared with SiO2, Al2O3, MgO−Al2O3, BaO−Al2O3, Al2O3−SiO2, MgO−Al2O3−SiO2, and BaO−Al2O3−SiO2 to generate new derivatives of MCM-36. These nanocomposite materials are characterized by a layered structure consisting of microporous zeolite layers and mesoporous slit-shaped galleries formed by the incorporation of pure and mixed oxides between the zeolitic sheets. Enhanced Lewis acidity is generated by pillaring with (mixed) aluminum oxides. The adsorption of 2.6-di-tert-butyl-pyridine (2.6-DTBPy) demonstrated for all materials an increased accessibility to acid sites at the pore mouth or the outer surface of the zeolite layers compared to MCM-22. For (MgO/BaO)−Al2O3−SiO2−MCM-36 additional Bronsted acid sites of higher strength than the sites in the zeolitic sheets are observed, which are assigned to the silica−alumina clusters in the interlayer galleries. Basic properties were introduced by the incorporation of alkaline earth oxide aluminates (MgO/BaO−Al2O3) int...
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