Experimental Study on the Effect of Metal at A/B Site of ABO3 Oxygen Carrier on the Performance of Chemical Chain Oxidation of Ethane to Ethylene
Perovskite oxygen carriers have attracted much attention due to their low cost,variability of A/B-site metals,and excellent oxygen storage and release performance.They are widely used in the preparation of ethylene in chemical chain oxidation reactions.In this paper,different ABO3 perovskite oxygen carriers are prepared by using the citric acid complexation method.The effect of A/B metal on the reaction performance of oxygen carrier ethane is studied,and the oxygen carrier with the best reaction performance is obtained.The structure of the catalyst is characterized by XPS,O2-TPD and other methods.According to kinetic studies,BaCoO3 has the best reaction performance among the different A/B position metals forming perovskite oxygen carriers,with the highest ethane conversion of 60%,ethylene selectivity of 75%and ethylene yield of 46%,showing its intrinsic reaction characteristics.After 12 cycles of BaCoO3,the specific surface area and pore size decreases slightly,the ethane conversion decreases by about 4%,and the ethylene selectivity remains basically unchanged,indicating that the cycle stability of oxygen carrier is excellent.
ethylenechemical chain oxidationperovskite oxygen carrierradius and valence stateoxidative dehydrogenation
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