摘要
利用溶胶-凝胶法合成了萤石型稀土复合氧化物(Ce_(0.8)La_(0.2))_(1-x)Ca_xO_(2-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(Ce_(0.8)La_(0.2))_(1-x)Ca_xO_(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(Ce_(0.8)La_(0.2))_(1-x)Ca_xO_(2-δ)对应的氨产率分别达7.2×10-9和7.5×10-9mol·s-·1cm-2.
Fluorite-type rare earth complex oxides of （Ce0.8La0.2）1-xCaxO2-δ were prepared by a sol-gel process. Crystal structure and microstructure of the product were characterized by X-ray diffraction （XRD）, transmisson electron microscopy （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-δ respectively at 650 ℃.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2005年第9期967-970,共4页
Acta Physico-Chimica Sinica
基金
新疆维吉尔自治区高校科研重点项目(XJedu2004I11)资助~~
关键词
溶胶-凝胶
萤石结构
质子导电
合成氨
Sol-gel, Fluorite-type structure, Proton conductor, Ammonia synthesis
