物理化学学报 >> 2005, Vol. 21 >> Issue (09): 967-970.doi: 10.3866/PKU.WHXB20050905

研究论文 上一篇    下一篇

质子导体(Ce0.8La0.2)1-xCaxO2-δ 在合成氨中的应用

刘瑞泉; 谢亚红; 李志杰; 王吉德; 孙轶刚   

  1. 新疆大学化学化工学院, 乌鲁木齐 830046
  • 收稿日期:2005-01-04 修回日期:2005-02-23 发布日期:2005-09-15
  • 通讯作者: 王吉德 E-mail:awangjd@xju.edu.cn

Application of Proton Conductors (Ce0.8La0.2)1-xCaxO2-δ in Synthesis of Ammonia

LIU Rui-quan; XIE Ya-hong; LI Zhi-jie; WANG Ji-de; SUN Yi-gang   

  1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046
  • Received:2005-01-04 Revised:2005-02-23 Published:2005-09-15
  • Contact: WANG Ji-de E-mail:awangjd@xju.edu.cn

摘要: 利用溶胶-凝胶法合成了萤石型稀土复合氧化物(Ce0.8La0.2)1-xCaxO2-δ, 利用XRD、TEM和SEM对样品进行表征. 电化学方法研究表明, 合成样品在400~800 ℃温度范围内具有质子导电特性. 将(Ce0.8La0.2)1-xCaxO>2-δ高温烧结体用于固态质子传导电池, 在常压下以氮气和氢气为原料合成氨气, 并确定了合成氨的适宜条件. 650 ℃时Ce0.8La0.2O2-δ和(Ce0.8La0.2)0.975Ca0.025O2-δ对应的氨产率分别达7.2×10-9和7.5×10-9 mol•s-9•cm-9.

关键词: 溶胶-凝胶, 萤石结构, 质子导电, 合成氨

Abstract: Fluorite-type rare earth complex oxides of (Ce0.8La0.2)1-xCaxO2-δwere prepared by a sol-gel process. Crystalstructure and microstructure of the product were characterized by X-ray diffraction (XRD), transmisson electronmicroscopy (TEM) and scanning electron microscopy (SEM). Electrical conductivity measurements performed in N2/H2 over the temperature range of 400 to 800 ℃ showed that conductivity was enhanced by extrinsic doping. Ammonia was synthesized from nitrogen and hydrogen under atmospheric pressure in a solid state proton conducting cell reactor, and the optimal temperature determined in the ammonia production was 650 ℃. The effect of non-Faradaic electrochemical modification of catalytic activity (NEMCA) explained the effect of imposed potential on the rate of NH3 synthesis. The rates of evolution of ammonia were 7.2×10-9 mol•s-1•cm-2 and 7.5×10-9 mol•s-1•cm-2 for Ce0.8La0.2O2-δ and (Ce0.8La0.2)0.975Ca0.025O2-δrespectively at 650 ℃.

Key words: Sol-gel, Fluorite-type structure, Proton conductor, Ammonia synthesis