摘要
采用低温燃烧法制备了Sr2+部分取代La3+的La1-xSrxCo0.5Mn0.5O3系钙钛矿型复合氧化物催化剂,用XRD,IR和BET等方法对催化剂进行了表征。利用程序升温反应(TPR)技术,对催化剂应用于柴油机常规排放物中的碳微粒和氮氧化合物(NOx)的同时催化脱除性能进行了研究。结果表明,Sr2+部分取代La3+,催化剂表面氧空位浓度增加,同时形成B3+-B4+共存体系,催化剂对碳颗粒和NOx催化活性显著提高。催化性能测试发现,x为0.4时催化活性最好,碳颗粒与催化剂紧密接触时,燃烧温度在305-435℃,NOx的转化率可达43.7%。
A series of complex oxide La1-xSrxCO0.5Mn0.5O3 perovskite-type catalysts in which La^3＋ is partly substituted for Sr^2＋ were synthesized at low temperature through a combustion process and the catalysts were characterized by XRD, IR and BET. The activity of the catalysts for simultaneous removal of NO~ and diesel soot particulates were examined in details using temperature programmed reaction （TPR） technique. The results show that after partial substitution of La^3＋ with Sr^2＋ the oxygen vacancy concentration increases significantly, B^3＋ - B^4＋ system is formed and consequently the catalytic activity for simultaneous removal of NOx and diesel soot particulates is significantly improved. It is found through catalytic property testing that catalytic activity is best when x=0.4 and the catalyst and the soot is mixtured tightly, temperature of soot combustion is 305- 435℃, the conversion rate of NOx can reach to 43.7%.
出处
《石油化工高等学校学报》
EI
CAS
2007年第1期35-38,共4页
Journal of Petrochemical Universities
基金
北京四属四管高校人才强教计划资助项目(BJJWR20051102)
