Abstract
This chapter describes Bronsted sites of enhanced acidity in zeolites. The nature of enhanced Bronsted acidity remains one of the key questions in mechanistic studies of the acid–base reactions on zeolites. The enhancement in acid strength is believed to be a result of the interaction between Bronsted sites and Lewis sites, created during steaming procedures, since both are present, and since it is known that, in solution, enhanced Brensted acidity can be generated by adding Lewis acid to Bronsted acid. However, as yet there is no direct proof that Lewis sites participate in the enhancement of Bronsted acidity. The chapter deals with reversible adsorption of a Lewis acid, BF 3 , on two zeolite materials in the H-form: EMT and ZSM-5, with the aim of creating a model system which demonstrates enhanced acidity without destruction of the zeolitic framework. Finally, it is important to note, that behavior of these two zeolite materials in terms of enhancement of Bronsted acidity due to interaction with Lewis acid BF 3 is in remarkable parallel with enhancement of their acidity as a result of steaming.
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