引用本文:
刘瑞泉, 谢亚红, 李志杰, 王吉德, 孙轶刚. 质子导体(Ce0.8La0.2)1－xCaxO2－δ 在合成氨中的应用[J]. 物理化学学报,
2005, 21(09): 967-970.
doi:
10.3866/PKU.WHXB20050905
Citation: LIU Rui-quan, XIE Ya-hong, LI Zhi-jie, WANG Ji-de, SUN Yi-gang. Application of Proton Conductors (Ce0.8La0.2)1－xCaxO2－δ in Synthesis of Ammonia[J]. Acta Physico-Chimica Sinica, 2005, 21(09): 967-970. doi: 10.3866/PKU.WHXB20050905
Citation: LIU Rui-quan, XIE Ya-hong, LI Zhi-jie, WANG Ji-de, SUN Yi-gang. Application of Proton Conductors (Ce0.8La0.2)1－xCaxO2－δ in Synthesis of Ammonia[J]. Acta Physico-Chimica Sinica, 2005, 21(09): 967-970. doi: 10.3866/PKU.WHXB20050905
质子导体(Ce0.8La0.2)1－xCaxO2－δ 在合成氨中的应用
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.
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关键词:
- 溶胶-凝胶;萤石结构;质子导电;合成氨
English
Application of Proton Conductors (Ce0.8La0.2)1－xCaxO2－δ in Synthesis of Ammonia
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 ℃.
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