丙烷脱氢用高稳定性Pt基催化剂研究进展

Propene is an important organic chemical, and its demand has been increasing all over the world recently, resulting in a short supply. Propane dehydrogenation (PDH) is an on-purpose propene production process using propane as the raw material. PDH has attracted much attention due to the advantages of abundant raw materials, high propene selectivity, easy separation of products, etc. The review mainly describes the research progress of structure regulation of high stable Pt based catalysts and processes for PDH in the last ten years. It is concluded that the Pt based catalysts showed the highest activity and propene selectivity. However, Pt based catalysts are easier to deactivate by coking and tend to sinter at high temperature, leading to catalyst stability decease. In order to improve the stability of Pt based catalysts, researches are mainly focused on the design of catalyst structure and the optimization of process conditions. In the regulation of Pt active site, methods of ① modifying the structure properties of Pt sites, such as dispersion, particle size; ② introducing metal promoter, such as Sn, Cu, Ga, Zn; ③ regulating the properties of support, such as its acidity, surface area, porous structure, and metal-support interaction, could be adopted to improve the anti-sintering and anti-coking properties of Pt based catalyst. In process optimization, co-feeding CO₂, H₂, steam or other alkanes with propane, could greatly improve the anti-coking stability of Pt based catalyst and propene yield. Lastly, it is pointed out that effective coupling of the structure of Pt based catalyst and process condition is the key for improving the catalyst stability and propene yield in the future.