La-K-Co-Mn-O钙钛矿型复合氧化物同时去除碳颗粒和NO_X的性能  

Performance of La-K-Co-Mn-O oxide catalysts for simultaneous removal of soot and NO_x from diesel engine exhaust

作　　者：王军利[1,2] 王虹[2] 孙志强[2] 任晓光[2] 

机构地区：[1]北京化工大学化工学院,北京100029 [2]北京石油化工学院化工系,北京102617

出　　处：《环境污染与防治》2008年第12期40-42,46,共4页Environmental Pollution & Control

基　　金：北京市属市管高等学校人才强教计划资助项目(No.BJJWR20051102);重质油国家重点实验室开放课题基金资助项目(No.2007-01)

摘　　要：采用柠檬酸络合燃烧法合成制备了La1-xKxCo0.5Mn0.5O3(x为K+取代量,x=0、0.1、0.2、0.3、0.4、0.5)系列钙钛矿型复合金属氧化物催化剂,以X射线衍射、红外光谱和比表面积等手段对该催化剂进行表征,以常压固定床微型反应器程序升温氧化还原反应技术评价该催化剂同时去除模拟柴油机尾气中炭黑颗粒(表征柴油机尾气中的碳颗粒)和NOX的催化性能。结果表明,K+部分取代LaCo0.5Mn0.5O3中的La3+后,催化剂催化性能得到明显改善,炭黑颗粒的起燃温度(Tig)、峰值温度(Tm)和燃尽温度(Tf)均降低,NOX的转化率提高,最高为16.6%;La0.6K0.4Co0.5Mn0.5O3具有最佳的催化性能,炭黑颗粒的Tig、Tm和Tf分别为305、350、379℃,炭黑颗粒燃烧产物中CO2的体积分数为98.8%,NOX转化率为15.5%。A series of perovskit-type oxide catalysts La1-xKxCo0.5Mn0.5O3 were prepared in the lab. The catalysts were characterized by XRD, FT-IR and BET. The catalytic activity of the catalysts for simultaneous removal of soot and NOx from diesel engine exhaust was examined by the temperature programmed reaction （TPO） technique. The catalytic activity of the LaCo0. 5 Mn0.5O3 catalyst was significantly improved after a portion of its La^3＋ content was replaced by K^＋. The La0.6 K0.4 Co0.5 Mn0.5O3 performed the best with a lower temperature of soot combustion; Tig, Tm and Tf were 305℃, 350℃ and 379℃, respectively. Its selectivity for CO2 generated was 98.8% and that the NOx conversion rate was 15.5%.

关 键 词：钙钛矿 柴油机尾气 催化剂 碳颗粒 NOx 

分 类 号：X701[环境科学与工程—环境工程]