Acylation of 2-methoxynaphthalene in the presence of modified zeolite HBEA

The influence of postsynthesis treatment such as calcination and acid treat ment of zeolite HBEA has been studied in the acylation of 2-methoxynaphthal ene with acetic anhydride. The contribution of the inner and outer surface of zeolite HBEA is examined by conversion and product selectivity to a bulk y product, which can be formed only on the outer surface of HBEA, and to a linear product, which can be formed on the inner and outer surfaces. Calcin ation under high heating rate enhances the catalytic activity of the inner surface due to the formation of extraframework alumina species in the micro pores. FTIR-adsorption experiments of the bulky probe molecule 2,4,6-tri-te rt-butylpyridine, which does not fit into the micropores, revealed that the se alumina species are located preferentially in the micropores of HBEA. Ac id treatment increases the catalytic activity of the outer surface due to t he extraction of catalytically active extraframework alumina species out of the micropores and due to the formation of silanol groups, respectively. ( C) 1999 Academic Press.