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-butylpyridine (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)-Al 2 O 3 -SiO 2 -MCM-36 additional Brønsted 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-Al 2 O 3 ) into the interlayer space. Two basic hydroxyl functions were detected by CO 2 adsorption: (i) Mg(Ba)-OH and (ii) Al IV -OH groups on the spinel-type oxide clusters. The latter basic sites are attributed to hydroxyl groups on aluminum ions in a tetrahedral coordination sphere of the defect spinel-type oxide pillaring clusters.
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