Preparation and Physicochemical Characterization of La1-xCexCoO3+δ Perovskite Catalyst and Its Methane Catalytic Combustion
来源期刊：JOURNAL OF RARE EARTHS2004年第5期
论文作者：龙志奇 崔大立 李明来 崔梅生 张顺利 黄小卫
Key words：citric acid complexation; perovskite; methane; catalytic combustion; rare earths;
Abstract: Perovskite oxide LaCoO3 methane catalytic material was synthesized with citric acid complexation and bubbling method.The effect of doped cerium was studied on the series of La1-xCexCoO3+δ materials by means of BET,XRD and SEM techniques.Their catalytic behaviors were studied with methane catalytic complete combustion as probe reaction.The results show that doped cerium has great effect on crystal phase formation.When doped cerium is less than 0.3 (molar ratio),the crystal phase of oxide has little changed.When doped cerium is up to 0.5,Co3O4 phase is obviously discovered and the perfectibility of LaCoO3 perovskite crystal phase is deteriorated.When x is over 0.7,perovskite crystal phase is weakened or completely disappeared.Considering the crystal phase of oxides,the optimum doped cerium is about 0.3.The perovskite oxides can be formed at a low calcinations temperature of 700 ℃.When x is 0.3,the highest catalytic activity of T10% (390 ℃) and T90% (603 ℃) is obtained on the series of La1-xCexCoO3+δ materials calcined at 800 ℃.
龙志奇1，崔大立1，李明来1，崔梅生1，张顺利1，黄小卫1
(1.Grirem Advanced Materials Co.,Ltd,General Research Institute for Nonferrous Metals,Beijing 100088,China)
Abstract:Perovskite oxide LaCoO3 methane catalytic material was synthesized with citric acid complexation and bubbling method.The effect of doped cerium was studied on the series of La1-xCexCoO3+δ materials by means of BET,XRD and SEM techniques.Their catalytic behaviors were studied with methane catalytic complete combustion as probe reaction.The results show that doped cerium has great effect on crystal phase formation.When doped cerium is less than 0.3 (molar ratio),the crystal phase of oxide has little changed.When doped cerium is up to 0.5,Co3O4 phase is obviously discovered and the perfectibility of LaCoO3 perovskite crystal phase is deteriorated.When x is over 0.7,perovskite crystal phase is weakened or completely disappeared.Considering the crystal phase of oxides,the optimum doped cerium is about 0.3.The perovskite oxides can be formed at a low calcinations temperature of 700 ℃.When x is 0.3,the highest catalytic activity of T10% (390 ℃) and T90% (603 ℃) is obtained on the series of La1-xCexCoO3+δ materials calcined at 800 ℃.
Key words:citric acid complexation; perovskite; methane; catalytic combustion; rare earths;
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