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Citation: LIU Rui-quan, XIE Ya-hong, LI Zhi-jie, WANG Ji-de, SUN Yi-gang. Application of Proton Conductors (Ce_0.8La_0.2)_1－xCa_xO_2－δ in Synthesis of Ammonia[J]. Acta Physico-Chimica Sinica, ;2005, 21(09): 967-970. doi: 10.3866/PKU.WHXB20050905 shu

Application of Proton Conductors (Ce_0.8La_0.2)_1－xCa_xO_2－δ in Synthesis of Ammonia

1.
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046

Received Date: 4 January 2005
Available Online: 15 September 2005

Fluorite-type rare earth complex oxides of (Ce_0.8La_0.2)_1－xCa_xO_2－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 Ce_0.8La_0.2O_2－δ and (Ce_0.8La_0.2)_0.975Ca_0.025O_2－δrespectively at 650 ℃.
- Sol-gel;Fluorite-type structure;Proton conductor;Ammonia synthesis
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Application of Proton Conductors (Ce0.8La0.2)1－xCaxO2－δ in Synthesis of Ammonia

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通讯作者: 陈斌, bchen63@163.com

Application of Proton Conductors (Ce_0.8La_0.2)_1－xCa_xO_2－δ in Synthesis of Ammonia