Affiliation:
1. Pisarzhevskii Institute of Physical Chemistry of the NASU 03028 Kyiv Ukraine
2. Chuiko Institute of Surface Chemistry of the NASU 03164 Kyiv Ukraine
3. Laboratoire de Réactivité de Surface Sorbonne Université CNRS, UMR 7197 Paris F-75005
Abstract
AbstractThe influence of adding Cr(III) compounds into Zn−BEA zeolite samples (with silicate modulus Si/Al=17, 100, and 1000) on the redox and acid–base characteristics of Cr/Zn−BEA zeolites were studied, and their catalytic properties in propane dehydrogenation with CO2 to propylene. It was established (based on the XRD, low–temperature (77 K) ad/desorption of N2, TPR−H2, TPD−MSC−NH3(CO2), C3H8(C3H6), FTIR−Py data) that the acid–base characteristics of the surface of bifunctional Cr/Zn−BEA catalysts, namely the amount, strength, and nature (Lewis and Brønsted sites), determine their activity/selectivity, and operation stability in the process of CO2−PDH. This indicates that over Cr/Zn−BEA catalysts, the process runs along the route of direct propane dehydrogenation combined with the reverse water gas shift reaction.
Funder
National Research Foundation of Ukraine