Thermogravimetric Study on Oxygen Adsorption/Desorption Properties of Double Perovskite Structure Oxides REBaCo2O5+δ（RE= Pr,Gd,Y）
来源期刊：Journal of Rare Earths2007年第3期
论文作者：郝好山 郑路 王颖芳 刘世江 胡行
文章页码：275 - 281
摘 要：The oxygen adsorption/desorption properties of double perovskite structure oxides PrBaCo2O5+δ,GdBaCo2O5+δ,and YBaCo2O5+δ were investigated by the thermogravimetry（TG）method in the temperature range of 400900 ℃.The calculated oxygen adsorption/desorption surface reaction rate constants ka and kd of these double perovskite structure oxides were larger than the commonly used cubic perovskite oxides,such as Ba0.95Ca0.05Co0.8Fe0.2O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ,whereas,the oxygen permeation flux was comparable to that of the latter,which was attributed to the smaller difference of oxygen vacancy in oxygen and nitrogen atmosphere（Δδ/Vmol）in these double perovskite structure oxides.The large oxygen adsorption/desorption rate constants of GdBaCo2O5+δ and PrBaCo2O5+δ made them nice catalyst coating materials,on other membrane surfaces,to improve the oxygen permeability.
郝好山，郑路，王颖芳，刘世江，胡行
摘 要：The oxygen adsorption/desorption properties of double perovskite structure oxides PrBaCo2O5+δ,GdBaCo2O5+δ,and YBaCo2O5+δ were investigated by the thermogravimetry（TG）method in the temperature range of 400900 ℃.The calculated oxygen adsorption/desorption surface reaction rate constants ka and kd of these double perovskite structure oxides were larger than the commonly used cubic perovskite oxides,such as Ba0.95Ca0.05Co0.8Fe0.2O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ,whereas,the oxygen permeation flux was comparable to that of the latter,which was attributed to the smaller difference of oxygen vacancy in oxygen and nitrogen atmosphere（Δδ/Vmol）in these double perovskite structure oxides.The large oxygen adsorption/desorption rate constants of GdBaCo2O5+δ and PrBaCo2O5+δ made them nice catalyst coating materials,on other membrane surfaces,to improve the oxygen permeability.
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