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The Catalytic Performance of 14-Membered Ring Zeolites

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
182
Issue
2
Identifiers
DOI: 10.1006/jcat.1998.2367

Abstract

Abstract We have synthesized and carried out extensive characterization (IR, MAS NMR, TPD, Ar and N 2adsorption, and scanning electron microscopy) of two unidirectional 14-membered ring zeolites (CIT-5 and UTD-1) and one unidirectional 12-membered ring zeolite (SSZ-24). All three samples have comparable acidic properties and are of comparable crystal size. The performance of these three zeolite samples in the catalytic cracking of n-decane, triisopropylbenzene, and a complex industrial feed (vacuum gas oil) have been evaluated. The performance of CIT-5, a 14-membered ring zeolite, is indistinguishable from that of SSZ-24, a 12-membered ring zeolite. A large, flat molecule—such as triisopropylbenzene—can be converted inside the 14-membered ring channels of a UTD-1 zeolite, but not inside the pores of CIT-5 or SSZ-24. In the catalytic cracking of complex feedstock, all three of the unidirectional zeolites are inferior in performance to the conventional tridirectional zeolites, such as USY or Beta zeolites.

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