Halide ions doped SrMnO3 for chemical looping oxidative dehydrogenation of ethane

Abstract

The chemical looping oxidative dehydrogenation (CL-ODH) of ethane represents a highly effective approach for converting ethane into the value-added product ethylene. This investigation focused on the synthesis of SrMnO₃ and its halide ions doped derivatives (SrMnO₃Cl and SrMnO₃Br) through the sol-gel method. The performance of these perovskites, employed as oxygen carriers in CL-ODH of ethane, was explored. The results unveiled several advantageous outcomes arising from the incorporation of halide ions (Cl⁻ and Br⁻) with larger radius into the oxygen sites of the SrMnO₃ perovskite. Halide ions doping notably induced cell volume expansion and enhanced lattice fringe spacing. Furthermore, it contributed to elevated oxygen vacancy concentration, increased Mn⁴⁺/Mn³⁺ molar ratio, and improved oxygen ions mobility within the bulk lattice. Fixed-bed experiments demonstrated that these redox catalysts, doped with halide ions, exhibited outstanding activity and stability during cycling tests, exhibiting enhanced both ethylene selectivity and yield in CL-ODH of ethane. In summary, the introduction of halide ions into SrMnO₃ emerges as a promising strategy for enhancing the performance of CL-ODH in ethane conversion for SrMnO₃ based oxygen carriers. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.