Jie Zhou,Qingdi Sun,Yuhan Qin,Hao Liu,Peng Hu,Chao Xiong,Hongbing Ji
Propane dehydrogenation (PDH) has been an outstanding technique with a bright prospect, which can meet the growing global demand for propylene. However, undesired side reactions result in the deactivation of the Pt-based catalysts, which contribute to the insufficient lifetime of the catalysts. Herein, we describe a novel catalyst by encapsulating bimetallic CoCu-modified Pt species in S-1 zeolite for efficient dehydrogenation of propane, which synergizes the confinement of zeolites and the geometric and electronic effects on Pt species for enhancing the catalyst stability. The introduction of bimetallic additives efficiently promotes the dispersion of platinum and the electron transfer between Pt species and the additives, which greatly prolongs the lifetime of the catalysts. Particularly, no obvious deactivation is observed on 0.2Pt0.3Co0.5CuK@S-1 after 93 h on stream with a weight hourly space velocity (WHSV) of 5.4 h −1 , revealing an ultralow deactivation constant of 0.0011 h −1 (t = 909 h). The formation rate of propylene still maintains at a high value of 407 mol g Pt -1 h −1 (WHSV = 21.6 h −1 ) at 580 ℃ even after on pure propane stream for 42 h. The catalyst with the bimetallic CoCu-modified Pt species in S-1 zeolite reveals ultra-high activity and stability for PDH, which is ascribed to the highly dispersed Pt species and the stabilization effect of bimetallic additives on Pt species.
Jie Zhou,Hao Liu,Chao Xiong,Peng Hu,Hao Wang,Xuyu Wang,Hongbing Ji
Propane dehydrogenation (PDH) has been a promising method to satisfy the increasing demand for propylene, but Pt-based catalysts always suffer from sintering and coke formation. Developing stable and efficient catalysts for PDH is of great significance for the industry. Herein, the paper reports that a catalyst with potassium-promoted Pt-In bimetallic clusters encapsulated in silicalite-1 (S-1) zeolite works as an efficient and stable catalyst for PDH. The catalyst achieves a propane conversion of 43.73 % with 97.14 % selectivity of propene and an extremely high propylene productivity of 20.33 mol g Pt -1 h -1 with a weight hourly space velocity (WHSV) of 6.75 h −1 . No obvious deactivation occurs after 48 h on stream, affording an extremely low deactivation constant of 0.0025 h −1 . The introduction of indium species greatly improves the propene selectivity and restricts the coke formation. The introduction of K + into S-1 can significantly enhance the catalytic activity and the stability of the catalyst. The catalyst with excellent activity and stability is potential for industrial application.
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