碳酸铵沉淀法与柠檬酸络合法制备LaCoO_3粉末性能对比研究

Comparative Study on Properties of LaCoO_3 Powders Prepared by Ammonium Carbonate Precipitation and Citric Acid Complexation

以硝酸镧和硝酸钴为原料,采用柠檬酸络合法与碳酸铵沉淀法分别制备稀土钙钛矿型LaCoO_3粉末。采用SEM、XRD、比表面积仪以及激光粒度仪等对产物进行表征。结果表明:高于600℃焙烧温度可制备得到稀土钙钛矿型LaCoO_3粉末,LaCoO_3粉末表面结构为蜂窝泡沫絮状结构;随着焙烧温度升高,表面出现不同程度烧结现象;以柠檬酸络合法制备得到的样品纯度较高,抗烧结能力强,粒度较小,催化脱硝效率达到90%以上。

Using La(NO3)3 and Co(NO3)2 as raw materials,rare earth perovskite LaCoO3 powder was prepared by citric acid complexation and ammonium carbonate precipitation,respectively.Products were characterized by SEM,XRD,specific surface area analyzer and laser particle size analyzer.The results show that the rare earth perovskite LaCoO3 powder can be prepared by calcination above 600℃,and the surface structure is the flocculent structure of honeycomb foam.With the increase of calcination temperature,the surface will be sintered at different degrees.The sample prepared by citric acid complexation has high purity,stronger sintering resistance and smaller particle size,the efficiency of catalytic denitrification is over 90%.