采用溶胶凝胶法合成Ce0.8Nd0.2O1.9(NDC)粉体,分别将1%(x,摩尔分数)的过渡金属氧化物(Transitional Metal Oxides,TMOs)MnO2,FeO1.5或CoO添加到NDC粉体中,经10MPa压片后于1 300℃烧结6h。用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM...采用溶胶凝胶法合成Ce0.8Nd0.2O1.9(NDC)粉体,分别将1%(x,摩尔分数)的过渡金属氧化物(Transitional Metal Oxides,TMOs)MnO2,FeO1.5或CoO添加到NDC粉体中,经10MPa压片后于1 300℃烧结6h。用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)对样品进行结构表征,采用交流阻抗谱(AC)测试样品导电性能。结果表明,MnO2,Fe2O3或CoO对NDC均可有效促进样品的致密化,增加相对致密度和提高NDC的晶粒电导率;1%(x)MnO2或1%(x)CoO的掺杂对NDC的晶界电导率产生有害的影响,掺杂1%(x)FeO1.5对NDC晶界杂质SiO2有一定的清除作用,提高晶界电导率。Fe2O3不仅是一种良好的烧结助剂,而且是一种有效的晶界清除剂。展开更多
In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides （TMO）,Fe2O3 and CuO,were prepared and added into pyrotechnical reagent ...In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides （TMO）,Fe2O3 and CuO,were prepared and added into pyrotechnical reagent with potassium perchlorate.Accelerating rate calorimeter （ARC） was used to study the catalysis of pyrotechnical reagent which is consisted of potassium perchlorate and composite catalyst.Composite catalyst of both Fe2O3 and CuO supported by active carbon can catalyze pyrotechnical reagent with potassium perchlorate.Furthermore,it can lower the apparent activation energy and accelerate the reaction with a smaller quantity than that with Fe2O3 and CuO.The maximal reaction rate of pyrotechnical reagent with potassium perchlorate mixed with Fe2O3/active carbon and CuO/active carbon is 8.31 min-1 and 9.13 min-1,which is 1.74 times and 1.91 times of pyrotechnical reagent mixed with no catalyst;time to maximal rate was 18.99 min and 1.96 min respectively,which is lower than pyrotechnical reagent mixed with no catalyst by 86.46% and 98.67% ;the apparent activation energy is 368.10 kJ·mol-1 and 325.29 kJ·mol-1,which is lower than pyrotechnical reagent mixed with no catalyst by 31.89% and 39.81% respectively.展开更多
文摘采用溶胶凝胶法合成Ce0.8Nd0.2O1.9(NDC)粉体,分别将1%(x,摩尔分数)的过渡金属氧化物(Transitional Metal Oxides,TMOs)MnO2,FeO1.5或CoO添加到NDC粉体中,经10MPa压片后于1 300℃烧结6h。用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)对样品进行结构表征,采用交流阻抗谱(AC)测试样品导电性能。结果表明,MnO2,Fe2O3或CoO对NDC均可有效促进样品的致密化,增加相对致密度和提高NDC的晶粒电导率;1%(x)MnO2或1%(x)CoO的掺杂对NDC的晶界电导率产生有害的影响,掺杂1%(x)FeO1.5对NDC晶界杂质SiO2有一定的清除作用,提高晶界电导率。Fe2O3不仅是一种良好的烧结助剂,而且是一种有效的晶界清除剂。
基金Sponsored by the National Natural Science Foundation of China(50874017)
文摘In order to improve the pyrotechnical reagent with potassium perchlorate,composite catalyst of active carbon supporting transition metal oxides （TMO）,Fe2O3 and CuO,were prepared and added into pyrotechnical reagent with potassium perchlorate.Accelerating rate calorimeter （ARC） was used to study the catalysis of pyrotechnical reagent which is consisted of potassium perchlorate and composite catalyst.Composite catalyst of both Fe2O3 and CuO supported by active carbon can catalyze pyrotechnical reagent with potassium perchlorate.Furthermore,it can lower the apparent activation energy and accelerate the reaction with a smaller quantity than that with Fe2O3 and CuO.The maximal reaction rate of pyrotechnical reagent with potassium perchlorate mixed with Fe2O3/active carbon and CuO/active carbon is 8.31 min-1 and 9.13 min-1,which is 1.74 times and 1.91 times of pyrotechnical reagent mixed with no catalyst;time to maximal rate was 18.99 min and 1.96 min respectively,which is lower than pyrotechnical reagent mixed with no catalyst by 86.46% and 98.67% ;the apparent activation energy is 368.10 kJ·mol-1 and 325.29 kJ·mol-1,which is lower than pyrotechnical reagent mixed with no catalyst by 31.89% and 39.81% respectively.
