Selecting suitable oxygen carriers for chemical looping oxidative dehydrogenation of propane by thermodynamic method
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The growing demand of propene and its derivatives promotes the development of on-purpose propene production technology. Chemical looping oxidative dehydrogenation of propane (CL-ODHP) is an alternative with several advantages. The research in this paper focuses on selecting suitable oxygen carrier for CL-ODHP process by a comprehensive thermodynamic method. The Gibbs free energy changes of propane oxidative dehydrogenation reactions to temperature for 45 different oxygen carriers are calculated to evaluate their reactivity and availability for propane oxidative dehydrogenation. Meanwhile, the chemical stability including gas oxygen releasing and hydroxides formation of different oxygen carrier systems are considered. Furthermore, the Gibbs free energy minimization method is used to calculate the equilibrium compositions of CL-ODHP reactions system considering side reactions. And propane conversion and propene selectivity of different oxygen carriers under different conditions are obtained. Other important properties are also qualitatively estimated. Among the studied oxygen carriers, Mn-based and Mo-based oxygen carriers would be more suitable for CL-ODHP process than others. And Al2O3, SiO2, TiO2, ZrO2 and Y2O3 can be the suitable binder candidates.
KeywordsPropane oxidative dehydrogenation Propene production Chemical looping Oxygen carrier Metal oxide Thermodynamic method
This research was supported by the China Scholarship Council [CSC201806080086]; the National Natural Science Foundation of China [51604078, 51704071]; the Fundamental Research Funds for the Central Universities [N182504011].