Synergistic mechanism of isolated Fe3+ and highly dispersed Ptδ+ over zeolite for boosting propane dehydrogenation

Abstract

AbstractPt‐based catalysts have been widely investigated in propane dehydrogenation (PDH) owing to their high activity in CH activation, while it suffers from Pt sintering and coke deposition. We develop a transition metal Fe and zeolite support synergistic‐modified method to realize the highly dispersed and stable Pt species inside zeolite over Pt/Fe‐silicate‐1. And it shows the excellent PDH performance with propylene generation rate of 51.6 mol C3H6 gPt−1 h−1 and low deactivation rate constant kd of 0.017 h−1 as well as a high TOFPt of 37.6 s−1 at 550°C. The systematic characterizations reveal the isolated Fe3+ species could significantly improve Pt dispersity and regulate Pt electronic density to realize a more positive Ptδ+ species inside Silicalite‐1 pore. And the further in situ DRIFTS experiments demonstrate that the synergistic effect between the appropriate acidic Fe sites and the highly dispersed Ptδ+ species around Fe species are responsible for the superior PDH performance.