Effect of Surface Acidity/Basicity of Cr/Zn−BEA Zeolite Catalysts on Performance in CO₂‐PDH Process release_bygndhkorfhhxhkuvrem7srqp4

Abstract

<jats:title>Abstract</jats:title>The 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 CO<jats:sub>2</jats:sub> to propylene. It was established (based on the XRD, low–temperature (77 K) ad/desorption of N<jats:sub>2</jats:sub>, TPR−H<jats:sub>2</jats:sub>, TPD−MSC−NH<jats:sub>3</jats:sub>(CO<jats:sub>2</jats:sub>), C<jats:sub>3</jats:sub>H<jats:sub>8</jats:sub>(C<jats:sub>3</jats:sub>H<jats:sub>6</jats:sub>), 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 CO<jats:sub>2</jats:sub>−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.
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