| Preparation and High-Temperature Water-Gas Shift Catalytic Features of La1-xCexFeO3 Perovskite |
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| 引用本文： | 马红钦,朱慧铭,谭欣,张继炎,张鎏. Preparation and High-Temperature Water-Gas Shift Catalytic Features of La1-xCexFeO3 Perovskite[J]. 中国稀土学报(英文版), 2004, 22(3): 357-360 |
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| 作者姓名： | 马红钦 朱慧铭 谭欣 张继炎 张鎏 |
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| 作者单位： | SchoolofChemicalEngineering＆Technology,TianjinUniversity,Tianfin300072,China |
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| 摘 要： | Based on water-gas shift reaction mechanism and perovskite compounds characteristics, La1-xCexFeO3(.K) perovskite were designed and prepared as shift catalysts. DTA and XRD results reveal that La1-xCexFeO3 can be formed at 730-760℃ by mechanic-mix thermal decomposition method. Activity and heat-resisting tests show that La1-xCexFeO3 (.K) possess high thermal stability if x is less than or equals to 0.5. But when x is greater than 0.5, La1-xCexFeO3 (.K) will be converted into ceria and magnetite partially or completely under shift reaction conditions. In the case of x=0.5, the conversion of CO is about 68% at 530℃. Potassium can greatly improve the low temperature activity, but slightly reduces the high temperature activity, and has little impact on the thermal stability. La0.5Ce0.5FeO3(.K) is a promising chromium-free high temperature shift catalyst.
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| 关 键 词： | La1-xCexFeO3 稀土 催化剂 高温水气转换 制备 DTA XRD 钙钛矿 |
Preparation and High-Temperature Water-Gas Shift Catalytic Features of La1-xCexFeO3 Perovskite |
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| Ma Hongqin,Zhu Huiming,Tan Xin,Zhang Jiyan,Chang Liu. Preparation and High-Temperature Water-Gas Shift Catalytic Features of La1-xCexFeO3 Perovskite[J]. Journal of Rare Earths, 2004, 22(3): 357-360 |
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| Authors: | Ma Hongqin Zhu Huiming Tan Xin Zhang Jiyan Chang Liu |
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| Abstract: | Based on water-gas shift reaction mechanism and perovskite compounds characteristics, La1-xCexFeO3 (.K) perovskite were designed and prepared as shift catalysts. DTA and XRD results reveal that La1-xCexFeO3 can be formed at 730～760 ℃ by mechanic-mix thermal decomposition method. Activity and heat-resisting tests show that La1-xCexFeO3 (.K) possess high thermal stability if x is less than or equals to 0.5. But when x is greater than 0.5, La1-xCexFeO3 (.K) will be converted into ceria and magnetite partially or completely under shift reaction conditions. In the case of x=0.5, the conversion of CO is about 68% at 530 ℃. Potassium can greatly improve the low temperature activity, but slightly reduces the high temperature activity, and has little impact on the thermal stability. La0.5Ce0.5FeO3 (.K) is a promising chromium-free high temperature shift catalyst. |
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| Keywords: | catalytic chemistry perovskite compounds chromium-free high-temperature shift catalyst rare earths |
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