Catalytic Combustion of Propane over Pt-Mo/ZSM-5 Catalyst: The Promotional Effects of Molybdenum

Abstract

To improve propane combustion activity and illustrate the promotional effects of molybdenum doping, Pt-Mo/ZSM-5 catalysts with different Mo amounts were prepared by the co-impregnation method. XRD, Raman, H2-TPR, NH3-TPD, in situ DRIFTs, XPS and other characterizations were performed. The results indicated that the concentration of Pt0 in Pt/ZSM-5 catalyst increased after the doping of Mo and the content of Pt0 had a positive correlation with the reaction turnover frequency value. The propane combustion activity of Pt/ZSM-5 catalyst was significantly improved after the doping of molybdenum species. Among all the catalysts, Pt-6Mo/ZSM-5 catalyst (Pt/ZSM-5 with 6 wt.% Mo modification) showed the lowest T50 and T90 for propane catalytic combustion. Moreover, the Pt-Mo/ZSM-5 catalyst exhibited outstanding catalytic stability.

Influence of Mo modification on coaromatization coupling methanol with n-hexane over [Zn,Mo]/HZSM-5 catalysts

“…In addition, the BE of Mo shifted higher with increasing Mo loading, which was related to the interactions between the metal and support. 41…”

Pt on Atomic-Layered WO3 Islands: Electronic Tuning of Platinum–Tungsten Heterostructures for Highly Efficient Low-Temperature VOC Combustion

“…Enriching the electron density of the Pt surface through electronic metal–support interaction, ,,, variations in work functions of metal and support, as well as distinct reduction procedures , can facilitate oxygen activation and reactant adsorption, thus accelerating oxidation rates. Previous work has demonstrated that secondary promoters can adjust the electronic state of Pt, thereby affecting catalytic performance. − For instance, d-block transition metal oxides like VO x , , WO 3 , ,, and MoO 3 ,,− can modulate the electron density of neighboring Pt when placed in proximity, demonstrating promotional effects such as tailoring adsorption behavior and enhancing ability to oxidize VOCs. However, a fundamental understanding of the underlying principles governing these “electro-tuning” phenomena, encompassing both the spatial and electronic structures of Pt and the secondary metal oxides, and how these relate to reactant adsorption and activation, is still largely missing.…”

“…Considerable efforts have focused on strategies to improve supported Pt nanocatalysts, including metal–support interactions, promoters, and structural adjustments. − Tailoring Pt’s electronic properties to enhance its interactions with reactants like VOCs and oxygen is of particular interest. Enriching the electron density of the Pt surface through electronic metal–support interaction, ,,, variations in work functions of metal and support, as well as distinct reduction procedures , can facilitate oxygen activation and reactant adsorption, thus accelerating oxidation rates.…”