CO2-Assisted Dehydrogenation of Propane to Propene over Zn-BEA Zeolites: Impact of Acid–Base Characteristics on Catalytic Performance

Research results about the influence of BEA zeolite preliminary dealumination on acid–base characteristics and catalytic performance 1% Zn-BEA compositions in propane dehydrogenation with CO2 are presented. The catalyst samples, prepared through a two-step post-synthesis procedure involving partial or complete specimen followed by introduction Zn2+ cations into T-positions framework, were characterized using XRD, XPS, MAS NMR, SEM/EDS, low-temperature N2 ad/desorption, C3H8/C3H6 (CO2, NH3)-TPD, TPO-O2, FTIR-Py techniques. Full resulted development mesoporous structure specific surface area (BET) twofold decrease total acidity basicity Zn-BEA, formation Lewis acid sites basic predominantly medium strength, as well removal Brønsted from surface. In presence ZnSiBEA catalyst, which had lowest basicity, obtained selectivity 86–94% yield 30–33% for propene (at 923 K) exceeded values ZnAlSiBEA ZnAlBEA. with/without carbon dioxide showed advantages producing target olefin catalysts.