石油化工高等学校学报

石油化工高等学校学报 ›› 2009, Vol. 22 ›› Issue (3): 37-41.DOI: 10.3696/j.issn.1006-396X.2009.03.010

• 石油化工 • 上一篇    下一篇

La1 - x KxCoO3 钙钛矿型催化剂在柴油车尾气净化中的性能

朱玲1 , 梁存珍1 , 於俊杰2   

  1. 1. 北京石油化工学院环境工程系,北京102617 ; 
    2. 中国矿业大学(北京) 化学与环境工程学院,北京100083
  • 收稿日期:2008-09-23 修回日期:2009-04-14 出版日期:2009-09-25 发布日期:2009-09-25
  • 作者简介:朱玲(1975 -), 女, 江苏靖江市, 副教授, 博士
  • 基金资助:
    北京市教委科技发展计划项目(KM200710017006);北京市属市管高等学校人才强教计划资助项目(PH R200906214);北京市科技新星资助项目(B 类)(2008B25)

Purifying Diesel Exhaust Over La1 - x KxCoO3 Perovskite - Type Catalyst

  1. 1.Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617,P.R. China;  
    2.College of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083,P.R. China
  • Received:2008-09-23 Revised:2009-04-14 Published:2009-09-25 Online:2009-09-25

摘要: 采用低温燃烧合成法制备了纳米级不同K 取代量的La1 - x KxCoO3 催化剂,通过H2 -TPR,XRD,BET 和化学分析等多种方法对催化剂的组成和结构进行了表征,利用程序升温氧化反应( TPO) 评价了催化剂同时净化碳颗粒物和NOx 的催化活性,考察了K+ 掺杂后晶体结构和表面氧化性能的变化对催化剂性能的影响。结果表明,K+ 部分取代La3 + 会影响La1 - x KxCoO3的晶体结构和组成。当x ≤0. 3 时,La1 - x KxCoO3仍为单一的斜方晶型钙钛矿结构,晶格参数和晶粒度增大;当x ≥0. 4 后,出现不能进入晶格析出的Co3O4 晶体。La1 - x KxCoO3钙钛矿
型催化剂对碳烟和NOx 同时净化具有良好的催化活性,La0. 7 K0. 3CoO3 催化剂氧的非化学计量值λ最大为0. 017 6,表面氧空位量最多,催化活性最好,碳烟在催化剂上的起燃温度下降到290 ℃,NOx 的转化率为53 %。

关键词: 钙钛矿复合氧化物 , 掺杂 , 柴油车排气 , 催化燃烧

Abstract: A series of pervoskite - type oxides , La1 - x KxCoO3complex catalyst s , with nanomet ric size were synthesized with low temperature through a combustion process. The catalyst s were characterized for crystal st ructure and chemical composition using H2 - TPR ,XRD ,BET and chemical analysis. The catalytic activities in simultaneous removal of NOx and soot f rom diesel exhaust were evaluated via temperature programmed oxidation ( TPO) equipment , and the effluent s of crystal st ructure and chemical composition on the catalytic activities were also discussed. The result s show that after partial substitution of La 3 + with K+ , the st ructure and component of La1 - x KxCoO3 will be changed. When x ≤0. 3 , La1 - x KxCoO3is single rhombic perovskite- type phase , the crystal parameters and crystal distances are also increased. And when x ≥0. 4 , Co3O4 is detected in the
samples. La1 - x KxCoO3catalyst s have better catalytic activities for simultaneous purification soot and NOx . La0. 7 K0. 3 CoO3 , with the biggest amount s of non - stoichiomet ric oxygen and oxygen vacancy , shows the highest catalytic activities. The ignition temperature for soot combustion on La0. 7 K0. 3CoO3 is dropped to 290 ℃, the conversion ratio of NOx can reach to 53%.

Key words: Perovskite - type oxides , Substitution , Diesel exhaust , Catalytic combustion

引用本文

朱玲,梁存珍,於俊杰. La1 - x KxCoO3 钙钛矿型催化剂在柴油车尾气净化中的性能[J]. 石油化工高等学校学报, 2009, 22(3): 37-41.

ZHU Ling,LIANG Cun-zhen,YU Jun-jie. Purifying Diesel Exhaust Over La1 - x KxCoO3 Perovskite - Type Catalyst[J]. Journal of Petrochemical Universities, 2009, 22(3): 37-41.

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