In this work, the preparation, modification, and application of mesoporous zeolitic cationites with high sorption and catalytic properties for the synthesis of ethyl tert-butyl ether (ETBE) from an ethanol–isobutene mixture are presented. The acidity distribution (pKa = 0.8–6.4) and isothermal heat of ethanol adsorption were evaluated for sulfonic cation exchangers. Catalytic tests conducted in a continuous fixed-bed reactor (333–373 K; 0.6–1.2 MPa) showed that mesostructured resins such as Amberlite IR-120, Tulsion T-52H, and KU-2-8 exhibit high activity and selectivity, achieving up to 97–99% selectivity toward ETBE. In contrast, Amberlyst 15Dry/36Dry demonstrated lower efficiency due to their smaller mesopores. It was proven that transition pores with diameters greater than 100 Å, which facilitate mass transfer, along with a high concentration of strong Brønsted acid sites, are the decisive factors that increase conversion and selectivity.

Nanomaterials, mesoporous zeolitic cationites, decationization,, modification

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