Tuning the Geometric and Electronic Structures in PtMn/SiO 2 Catalysts via Oxygen Plasma Treatment for Enhanced Propane Dehydrogenation

ABSTRACT With the rising global demand for propylene, propane dehydrogenation (PDH) is of great strategic importance, yet precisely regulating the geometric and electronic structures of Pt‐based catalysts remains a key challenge for optimizing their PDH performance. Herein, a low‐temperature oxygen plasma (OP) treatment via a dielectric barrier discharge reactor was developed to regulate the geometric and electronic structures of PtMn/SiO 2 catalysts. OP treatment promotes Pt dispersion, reducing the average Pt particle size of Pt 0.5 Mn 1.25 from 2.7 ± 1.2 nm to 1.2 ± 0.3 nm, and increases the electron cloud density of Pt, realizing electronic structure regulation at the optimal 25 W discharge power. The optimized Pt 0.5 Mn 1.25 ‐25W catalyst exhibits excellent mass‐normalized activity (171 mol C3H8 ·g Pt −1 ·h −1 ) and an ultralow deactivation rate constant ( k d = 0.0058 h −1 ), outperforming most reported Pt‐based catalysts.