摘要
采用柠檬酸络合法制备了不同Ni含量的LaNixFe1-xO3系列复合氧化物载氧体。采用热分析、X射线衍射、程序升温还原和扫描电境等手段对载氧体进行了表征,并在化学链燃烧反应中进行性能评价。XRD表征结果表明不同Ni含量的LaNixFe1-xO3均能形成钙钛矿结构,TPR表征结果表明随Ni含量增加,LNixaFe1-xO3上氧数量增加,还原能力增强。在连续十次化学链燃烧反应中,95%一氧化碳在LaFe0.5Ni0.5O3上被氧化,扫描电境照片发现部分载氧体颗粒出现破碎、烧结现象。
A series of LaNixFe1-xO3 oxygen carriers with different Ni content was prepared by citric acid complex method,and their properties were characterized by thermal analysis,X-ray diffraction,temperature programmed reduction and scanning electron microscopy.The catalytic performances of the prepared samples were investigated in chemical-looping combustion of CO.The XRD results showed that LaNixFe1-xO3 oxides possessed perovskite-type structure.TPR results indicated that the oxidation ability of LaNixFe1-xO3（x0） was stronger than that of LaFeO3.Especially,the sequential redox reaction revealed that LaFe0.5Ni0.5O3 oxide exhibited high oxygen delivery capacity after 10 redox cycles,and CO conversion ratio was above 95% in each cycle.The structure of LaFe0.5Ni0.5O3 oxide did not change obviously after 10 cycles except some little particles formed on big particles due to heat release in the oxidation processes.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第1期96-101,共6页
Journal of the Chinese Society of Rare Earths
关键词
化学链燃烧
钙钛矿
载氧体
柠檬酸络合法
稀土
chemical-looping combustion
perovskite
oxygen carrier
citric acid complex method
rare earths
作者简介
王钰佳（1988-），女，硕士研究生；研究方向：新型制氢技术和二氧化碳捕集技术
通讯联系人（E-mail：lianghao2003@126．com）
