Construction of framework confined ordered mesoporous Pt/TixAlOy catalysts and applied for the catalytic oxidation of propane

• Published in: Microporous and mesoporous materials 2022-08, Vol.341, p.112111, Article 112111
• Main Authors: Liu, Liqiong, Han, Weiliang, Dong, Fang, Feng, Hua, Zhicheng, Tang
• Format: Article
• Language: English
• Subjects: Evaporation-induced self-assembly; Framework confinement; Ordered mesoporous; Propane; Pt/TixAlOy catalysts
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2022.112111

The framework confined Pt/TixAlOy catalysts were prepared by a one-step evaporation-induced self-assembly (EISA) technique, and their activities for the catalytic oxidation of propane were investigated. The Pt/TixAlOy catalysts exhibited high specific surface area due to the ordered mesoporous structure. With the increase of TiO2 contents, the specific surface area and acidic sites of Pt/TixAlOy catalysts increased. The specific surface area and acidic sites could improve the exposure of the active sites and electron transfer of Pt and TiO2, which was beneficial to catalytic oxidation of propane. However, too high acidic sites of catalysts could lead to coke deposition and clogging of the pores, and the addition of TiO2 had the optimal value. The Pt/Ti0.1AlOy catalyst exhibited superior catalytic activity, which could be attributed to the higher specific surface area, higher the percentage of Pt2+ and lattice oxygen, abundant acid sites, and higher redox properties. In addition, the Pt/Ti0.1AlOy catalyst also exhibited superior sulfur resistance due to the multiple acidic sites of catalysts. The framework confined Pt/TixAlOy catalysts with the ordered mesoporous structure were prepared by the one-step evaporation-induced self-assembly (EISA) technique. Among, the order mesoporous Pt/Ti0.1AlOy catalyst had the best catalytic activity, superior thermal stability, and good resistance to water and sulfur due to higher specific surface area, a higher percentage of Pt2+ and lattice oxygen, abundant acid acidic, higher redox properties and confinement effect. [Display omitted] •Ordered mesoporous Pt/TixAlOy catalysts were synthesized by one-step evaporation-induced self-assembly technique.•Pt nanoparticle was confined in the framework of TixAlOy.•Pt/TixAlOy catalysts exhibited excellent thermal stability and water resistance.•The sulfur resistance of Pt/TixAlOy catalysts was improved with the increase of Ti content.