Ethylene production over A/B-site doped BaCoO3 perovskite by chemical looping oxidative dehydrogenation of ethane

Abstract

Ethylene is a valuable and widely used platform inindustrial chemical. Herein, we report a potential route for selective and efficient ethylene production via chemical looping oxidative dehydrogenation of ethane using alkaline, rare earth and transition metals modified BaCoO3 perovskite as the circulative redox catalyst. The catalysts were characterized by XRD, XPS, SEM, TEM, N2 adsorption-desorption, H2-TPR, and O2-TPD analyses. Results showed that ethane conversion and ethylene selectivity were mainly regulated by lattice oxygen and Co valence of the catalysts, respectively. Doping of La to A-site of BaCoO3 promoted ethane conversion while doping of Cu to B-site contributed to ethylene selectivity. Both ethane conversion and ethylene selectivity were enhanced by the co-doping of La and Cu to A/B-site of BaCoO3, obtaining the highest selectivity of 81.2% at ethane conversion of 67.6%. The ethylene yield over Ba0.7La0.3Co0.8Cu0.2O3 was 7.9% higher than that over patent BaCoO3 (53.7% versus 45.8%). In addition, the Ba0.7La0.3Co0.8Cu0.2O3 catalyst also exhibited a stable catalytic performance during 12 redox recycles.