Abstract
Beta zeolite coated on a preshaped medium surface area silicon carbide carrier was prepared via an hydrothermal synthesis. 27Al MAS NMR analysis revealed that all the aluminium was in a tetrahedral coordination and no trace of extraframework aluminium was observed. The Full Width at Half Maximum of the NMR peak was about 10 ppm, which indicates the presence of small zeolite crystals inside the sample. SEM observation has shown that zeolite homogeneousely coated the outer surface of the silicon carbide extrudate support with different size and shape and random orientation. The existence of a layer of silica and silicon oxycarbide on the surface of the support allows a strong anchoring of the coated zeolite. Thus, no zeolite loss was observed after sonication treatment for various durations. The as-prepared catalyst exhibits a high catalytic activity in the acylation of anisole by the anhydride acetic in batch mode configuration.
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