首页|Mn-doped SrCoO3-δ Perovskite Oxides for Ethylene Production via Chemical Looping Oxidative Dehydrogenation of Ethane
Mn-doped SrCoO3-δ Perovskite Oxides for Ethylene Production via Chemical Looping Oxidative Dehydrogenation of Ethane
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Chemical looping oxidative dehydrogenation(CL-ODH)is an economically promising method for converting ethane into higher value-added ethylene utilizing lattice oxygen in redox catalysts,also known as oxygen carriers.In this study,perovskite-type oxide SrCoO3-δ and B-site Mn ion-doped oxygen carriers(SrCo1-xMnxO3-δ,x=0.1,0.2,0.3)were prepared and tested for the CL-ODH of ethane.The oxygen-deficient perovskite SrCoO3-δ exhibited high ethylene selectivity of up to 96.7％due to its unique oxygen vacancies and lattice oxygen migration rates.However,its low ethylene yield limits its application in the CL-ODH of ethane.Mn doping promoted the reducibility of SrCoO3-δ oxygen carriers,thereby improving ethane conversion and ethylene yield,as demonstrated by characterization and evaluation experiments.X-ray diffraction results confirmed the doping of Mn into the lattice of SrCoO3-δ,while X-ray photoelectron spectroscopy(XPS)indicated an increase in lattice oxygen ratio upon incorporation of Mn into the SrCoO3-δ lattice.Additionally,H2 temperature-programmed reduction(H2-TPR)tests revealed more peaks at lower temperature reduction zones and a decline in peak positions at higher temperatures.Among the four tested oxygen carriers,SrCo0.8Mn0.2O3-δ exhibited satisfactory performance with an ethylene yield of 50％at 710℃ and good stability over 20 redox cycles.The synergistic effect of Mn plays a key role in increasing ethylene yields of SrCoO3-δ oxygen carriers.Accordingly,SrCo0.8Mn0.2O3-δ shows promising potential for the efficient production of ethylene from ethane via CL-ODH.
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