Preparation and oxygen desorption performance modification of BaCoO3-δ perovskite-type materials via B-site cerium doping
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The oxyfuel combustion process is used as a potential technique to CO2 capture and the oxygen carries play a crucial role ofthis technology. Ba-Co based perovskites are promising materials to producing O2/CO2 gas for oxyfuel combustion. In thisstudy, perovskite oxides BaCo0.8M0.2O3-δ (M = Ce, Al, Fe, Cu) were prepared via an EDTA sol-gel method. Scanning electronmicroscope (SEM) was used to study the surface morphology and structure of the fresh and the used perovskite powders. Oxygen adsorption/desorption experiments were carried out in a fixed-bed system; and the oxygen desorption property ofBaCo0.8Ce0.2O3-δ was studied in details. The oxygen production amount of 1g BaCo0.8Ce0.2O3-δ perovskite powders can reach101.07 mg after one adsorption and desorption cycle. SEM results showed that the fresh samples had a porous structure;however the particles were covered by impurities after cycles due to the sintering. Experiments results indicated that theoptimal desorption temperature is 850oC. The optimal volume flow rate of carbon dioxide and partial pressures of carbondioxide were determined to be 200 ml·min1, 100% CO2 partial pressure, respectively. Furthermore, the results of cyclicperformance indicate that BaCo0.8Ce0.2O3-δ perovskite powder shows high cyclic stability for producing O2-enriched CO2stream.
Abstract
The oxyfuel combustion process is used as a potential technique to CO2 capture and the oxygen carries play a crucial role ofthis technology. Ba-Co based perovskites are promising materials to producing O2/CO2 gas for oxyfuel combustion. In thisstudy, perovskite oxides BaCo0.8M0.2O3-δ (M = Ce, Al, Fe, Cu) were prepared via an EDTA sol-gel method. Scanning electronmicroscope (SEM) was used to study the surface morphology and structure of the fresh and the used perovskite powders. Oxygen adsorption/desorption experiments were carried out in a fixed-bed system; and the oxygen desorption property ofBaCo0.8Ce0.2O3-δ was studied in details. The oxygen production amount of 1g BaCo0.8Ce0.2O3-δ perovskite powders can reach101.07 mg after one adsorption and desorption cycle. SEM results showed that the fresh samples had a porous structure;however the particles were covered by impurities after cycles due to the sintering. Experiments results indicated that theoptimal desorption temperature is 850oC. The optimal volume flow rate of carbon dioxide and partial pressures of carbondioxide were determined to be 200 ml·min1, 100% CO2 partial pressure, respectively. Furthermore, the results of cyclicperformance indicate that BaCo0.8Ce0.2O3-δ perovskite powder shows high cyclic stability for producing O2-enriched CO2stream.
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