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[EN] Unlike homogeneous catalysts that are often designed for particular reactions, zeolites are heterogeneous catalysts that are explored and optimized in a heuristic fashion. We present a methodol. for synthesizing active and selective zeolites by using org. structure-¿directing agents that mimic the transition state (TS) of preestablished reactions to be catalyzed. In these zeolites, the pores and cavities could be generated approaching a mol.-¿recognition pattern. For disproportionation of toluene and isomerization of ethylbenzene into xylenes, the TSs are larger than the reaction products. Zeolite ITQ-¿27 showed high disproportionation activity, and ITQ-¿64 showed high selectivity for the desired para and ortho isomers. For the case of a product and TS of similar size, we synthesized a catalyst, MIT-¿1, for the isomerization of endo-¿dicyclopentane into adamantane.Reserva de todos los derechosAbiertohttp://hdl.handle.net/10251/105508American Association for the Advancement of Science (AAAS)application/pdf Mª Teresa Portilla Ovejero Cecilia Gertrudis Paris-Carrizo Efigenio Alejandro Leon Escamilla Mercedes Boronat Zaragoza Manuel Moliner Marin Avelino Corma CanósScienceInglés
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