Evolution of Mn-Modified Silicalite-1 Zeolite-supported Nanocatalysts with the Regulated Pt–Ce Linkages for Propane Dehydrogenation

Propane dehydrogenation (PDH) is a pivotal technology for propylene production. Supported Pt catalysts for PDH are often subjected to nanoparticle agglomeration and coke deposition, thus limiting their stability and efficiency. Herein, we constructed a high-performance Pt-Ce catalyst consisting of CeO x with redox properties and active Pt species with the regulated electronic properties. Through the controllable impregnation, the unique structure of adjacent Pt-CeO x sites were elaborately supported on the Mn-modified Silicalite-1 (Mn-S-1). Characterization results reveal that the generated Ce 3+ /V O species contribute to the formation of electron-deficient Pt 0 -V O -Ce 3+ active sites via hydrogen spillover and electron transfer. Benefiting from the high dispersion of active components, appropriate acidity, redox activity of V O , and electron-deficient Pt 0 sites, the optimal 0.5Pt0.2Ce/Mn-S-1 catalyst exhibits superior propane conversion of 38.23%, propylene selectivity of 88.45%, and excellent coke resistance. This study not only reveals the intrinsic correlation between active Pt and CeO x species but also provides valuable guidance for designing highly efficient catalysts. Graphical A high-performance Pt-Ce catalyst consisting of CeO x with redox properties and active Pt species with the regulated electronic properties was constructed through a controllable impregnation. Benefiting from the high dispersion of active components, appropriate acidity, redox activity of V O , and electron-deficient Pt 0 sites, the optimal 0.5Pt0.2Ce/Mn-S-1 catalyst exhibits superior propane dehydrogenation performance.