超微粒La-Co氧化物催化剂对柴油机尾气碳黑催化燃烧性能的研究  

Catalytic Combustion of Diesel Soot over Rare Earths Ultrafine Powder La-Co Complex Oxide Catalysts

作　　者：刘坚[1] 赵震[1] 徐春明[1] 王虹[1] 姜亚昌 

机构地区：[1]石油大学重质油国家重点实验室,北京102249 [2]广东惠州瑞尔稀土材料公司,广东惠州515000

出　　处：《中国稀土学报》2005年第2期133-137,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(20473053);教育部支持留学归国人员科学研究及实验室建设重点基金资助项目

摘　　要：用有机酸络合法制备了Co3O4,NiCo2O4和LaCo2O43种催化剂。通过程序升温氧化反应(TPO)技术对这3种催化剂进行模拟柴油碳黑催化燃烧反应的活性评价。研究发现以Co3O4为活性成分的催化剂能显著降低碳黑燃烧的温度。以Ni和La部分取代Co3O4后形成的复合氧化物NiCo2O4和混合氧化物LaCo2O4能改进Co3O4的氧化活性。但是NiCo2O4不能改进碳黑在松散接触时的燃烧活性;而混合氧化物LaCo2O4由于形成了超微粒含缺陷的LaCoO3钙钛矿型结构,它具有良好的低温氧化活性和表面原子移动性,因而能显著改进碳黑在松散接触时的燃烧活性。Three kinds of catalysts were synthesized by organic acid compound method including Co_3O_4, NiCo_2O_4 and LaCo_2O_4. The catalytic perfermances of these catalysts for diesel soot catalytic combustion were investigated using temperature-programmed oxidation reactions. The results demonstrate that the catalysts containing Co_3O_4 active components can lower largely the temperature of soot combustion. NiCo_2O_4 and LaCo_2O_4 can enhance the catalytic activity of Co_3O_4. Under the condition of loose contact NiCo_2O_4 can not promote soot combustion, but LaCo_2O_4 can effectively promote soot combustion. This suggests that ultrafine powder perovskite-type catalyst LaCoO_3 produced, and which has good low temperature oxide ability and whose surface atoms are easily mobile.

关 键 词：超微粒 催化剂 碳黑 催化燃烧 稀土 

分 类 号：O643.3[理学—物理化学]