首页|Ethane Chemical Looping Oxidative Dehydrogenation to Ethylene over Co2O3(Fe2O3,NiO)/LaCoO3 Oxygen Carriers
Ethane Chemical Looping Oxidative Dehydrogenation to Ethylene over Co2O3(Fe2O3,NiO)/LaCoO3 Oxygen Carriers
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Ethane chemical looping oxidative dehydrogenation(CL-ODH)to ethylene is a new technology for converting ethane to ethylene.In the current study MeO/LaCoO3(MeO=Fe2O3,NiO or Co2O3)composite metal oxides were prepared via citrate gel and impregnation methods,and used as oxygen carriers for CL-ODH.X-ray diffraction results indicated that all oxygen carriers had a perovskite structure even after eight redox cycles.Under a reaction temperature of 650 ℃,a reaction pressure of 0.1 MPa,and a weight hourly space velocity(WHSV)of 7500 mL/(g·h),ethane conversion over Co2O3/LaCoO3 reached 100％and ethylene selectivity reached 60％,both of which were better than corresponding values attained over Fe2O3/LaCoO3 and NiO/LaCoO3.Ethylene selectivity remained stable for 80 cycles over Co2O3/LaCoO3,then decreased gradually after 80 cycles.X-ray photoelectron spectroscopy results and evaluation results indicated that lattice oxygen and O22-had a direct relationship with ethane conversion and ethylene selectivity.Co2O3/LaCoO3 exhibited a strong capacity to release and absorb oxygen,mainly due to interaction between Co2O3 and LaCoO3.
chemical looping oxidative dehydrogenationethaneethyleneoxygen carrierperovskite
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