Zeolite SSZ-53: An Extra-Large-Pore Zeolite with Interesting Catalytic Properties

摘要

Zeolites have found widespread use as catalysts in petroleum refining and petrochemistry and as selective adsorbents in separation and purification. A special class of zeolites comprises high-silica zeolites with extra-large pores (the term extra-large encompasses zeolites with pore openings delimited by rings with more than 12 tetrahedral (SiO4 or AlO4) centers)). Although such materials possess considerable potential in catalysis (and adsorption) with larger molecules, their catalytic potential has only scarcely been explored so far. One of the more recently discovered extra-large-pore zeolites is SSZ-53, which was discovered in the Chevron laboratories.[1], [2] Its pore system consists of linear, non-interconnected channels with pore openings formed from elliptical 14-rings with an approximate size of 0.65?.85 nm2.[3] The framework topology of SSZ-53 has been assigned the three letter code SFH by the Structure Commission of the International Zeolite Association.[4] Herein, we report on the hydrothermal synthesis of zeolite SSZ-53 and on its catalytic properties in the acid-catalyzed disproportionation of ethylbenzene and the conversion of n-decane on a bifunctional form of the zeolite.