Ce0.8Y0.2O1.9-Ca3(PO4)2-K3PO4复合电解质在中温区的质子导电性及在常压合成氨中的应用

A precursor of Ce_0.8Y_0.2O_1.9(YDC) solid electrolyte was synthesized by the gol-gel method. YDC and phosphates powders were prepared by mixing the YDC and phosphates according to different weight ratios. The mixtures of the YDC and binary phosphates were ground and sintered at 1 400 ℃. The proton conductivity in solid electrolyte of the sintered samples was examined using electrochemical methods at 400～800 ℃. Ammonia was synthesized from nitrogen and hydrogen at atmospheric pressure in the solid state proton conducting cell reactor. The optimal condition for the ammonia production was determined. The result indicated that composite electrolyte of 80wt% YDC: 20wt% binary phosphates as proton conductor could obtain the highest ionic conductivity and ammonia production rate among the four samples, the rate of evolution of ammonia was up to 9.5 × 10^-9 mol·s^-1·cm^-2.     

电感耦合等离子体原子发射光谱法测定高铬质耐火材料中次量及微量成分

采用电感耦合等离子体原子发射光谱法(ICP-AES)同时测定高铬质耐火材料中SiO2、Al2O3、Fe2O3、TiO2、CaO、MgO、ZrO2等次量及微量成分.通过试验确定了熔样方法,仪器最佳工作参数,ICP分析条件,分析谱线等,同时研究了基体效应.结果表明,样品用硼酸和无水碳酸钠混合熔剂在1000 ℃左右的温度下熔融,可以完全分解试样.引进试液中大量钠和基体铬对测定有影响,用基体匹配的方法克服,样品中含量较高的锆和铝对含量低的其它元素没有光谱干扰.该法分析待测元素含量的相对标准偏差小于2%,回收率为96%～104%.