Catalytic Properties of Hierarchical CsAlTi-BEA Zeolites in the Process of Conversion of Styrene with Co2 for Cyclic Carbonate Formation

Abstract

Hierarchical CsAlTi-BEA zeolites, due to the presence of a high concentration of Lewis acid sites formed by tetrahedrally coordinated Ti⁴⁺ ions in the zeolite structure and the neutralization of Brønsted acid sites by Cs⁺ cations, exhibit high catalytic activity in the tandem reaction of cyclic carbonate formation from styrene in the presence of tert-butyl hydroperoxide under CO₂ pressure. The conversion of styrene into epoxide and further into carbonate increases with the content of titanium in the samples, while the selectivity for the cyclic carbonate increases with the content of cesium.