Design of Hybrid Pellet Catalysts of WO3/Si-Al and PtIn/hydrotalcite Via Dehydrogenation and Metathesis Reactions for Production of Olefins from Propane

The design of hybrid pellet catalysts for dehydrogenation and metathesis of propane to olefins was investigated. Reaction kinetics and mathematical models of pellet catalysts in a reactor were developed and simulated using gPROMS. Three types of pellet catalysts including uniformly mixed, dehydrogenationcore (MDM) and dehydrogenation-shell (DMD) were compared with physically mixed pellet catalysts. A sensitivity analysis of operating conditions, ratios, types and sizes of pellet catalysts were performed to determine the optimal parameters offering a maximum alkene yield. The most suitable pellet catalyst type was DMD. Depending on operating conditions, the optimal DMD had a core metathesis diameter of between 0.28 and 3.43 mm, with spherical particles between 1 and 7 mm in diameter. The optimal DMD showed increased alkene yield up to 43%, while alkene selectivity improved by 25-35% from the base case. The amount of dehydrogenation catalysts reduced from the base case by approximately 59%. (c) 2020 Elsevier Ltd. All rights reserved.