Hierarchical MgAl₂O₄ Supported Pt-Sn As A Highly Thermostable Catalyst For Propane Dehydrogenation

The world demand for propylene is growing steadily in recently years. Propane dehydrogenation is an on-purpose and effective technique to increase the production of propylene. The current major hotspot and difficulty in the research of the olefins production is how to improve the platinum catalyst activity and thermal stability. The common methods for industrial catalysts' regeneration is to burn and note the chlorine, however, the addition of chlorine agent can not only increase the production cost, and also cause corrosion of the equipment. So the research of high stability propane dehydrogenation catalysts is of great significance.For the purpose of making comparison with the MgAl2O4 spinel prepared by coprecipitation, a flower-shaped MgAl2IO4 spinel was prepared by alcohol thermal. Under the condition of 800? calcined in air, the effects of carrier morphology on the particle size and dispersion of the metal particles was studied by HRTEM, CO-Chem, SEM, Py-IR and XRD. It drew the conclusion that MgAl2O4 prepared by alcohol thermal is a more stable carrier for Pt. Different proportion of Pt to Sn was supported on the catalyst. The optimal proportion (Pt to Sn is 1:0.3) was chosen by studying the catalytic activity. Under the optimal conditions, stability of the regeneration was studied by repeatedly recycled propane dehydrogenation reaction. This will do much benefit to reduce industrial propane dehydrogenation catalyst regeneration steps and costs.