Activity of La1 - xSr xCo0. 5Mn0. 5O3 Perovskite - Type Catalyst for Simultaneous Removal of Diesel Soot Par ticulates and NOx

Journal of Petrochemical Universities ›› 2007, Vol. 20 ›› Issue (1): 35-38.

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Activity of La_{1 - x}Sr _xCo_{0. 5}Mn_{0. 5}O₃ Perovskite - Type Catalyst for Simultaneous Removal of Diesel Soot Par ticulates and NO_x

SUN Zhi - qiang,WANG Hong

Department of Chemical Technology , Beij ing I nstitute of Petrochemical Technology , Beijing 102617 , P. R. China

Received:2006-06-08 Published:2007-03-20 Online:2017-06-28

La_{1 - x} Sr _xCo_{0. 5}Mn_{0. 5}O₃ 催化剂同时去除柴油机碳颗粒和NO_x 的性能

孙志强, 　王　虹#br#

北京石油化工学院化工系, 北京102617

作者简介:孙志强(1980 - ), 男, 山东临沂市, 在读硕士
基金资助:
北京四属四管高校人才强教计划资助项目(BJJWR20051102)

Abstract

Abstract:

　A series of complex oxide La_{1 - x}S r_x Co_{0. 5}Mn_{0. 5}O₃ perovskite - type catalysts in which La³⁺ is partly substituted for S r²⁺ 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_x 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 simultaneo us removal of NO_xand 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 NO_x can reach to 43. 7%.

Key words: Perovskite, , Catalyst , , Diesel, , Soot, , NO_x

摘要： 采用低温燃烧法制备了Sr^{2 +}部分取代La^{3 +}的La_{1- x}Sr xCo _{0. 5} Mn_{0. 5}O₃ 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(NO_x)的同时催化脱除性能进行了研究。结果表明, Sr^{2 +}部分取代La^{3 +} , 催化剂表面氧空位浓度增加, 同时形成B^{3 +} - B^{4 +}共存体系, 催化剂对碳颗粒和NO_x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 ℃, NO_x 的转化率可达43. 7%。

关键词: 钙钛矿, 　催化剂, 　柴油机, 　碳颗粒, 　NO_x

SUN Zhi - qiang,WANG Hong. Activity of La_{1 - x}Sr _xCo_{0. 5}Mn_{0. 5}O₃ Perovskite - Type Catalyst for Simultaneous Removal of Diesel Soot Par ticulates and NO_x[J]. Journal of Petrochemical Universities, 2007, 20(1): 35-38.

孙志强, 　王　虹. La_{1 - x} Sr _xCo_{0. 5}Mn_{0. 5}O₃ 催化剂同时去除柴油机碳颗粒和NO_x 的性能[J]. 石油化工高等学校学报, 2007, 20(1): 35-38.

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Activity of La_{1 - x}Sr _xCo_{0. 5}Mn_{0. 5}O₃ Perovskite - Type Catalyst for Simultaneous Removal of Diesel Soot Par ticulates and NO_x

La_{1 - x} Sr _xCo_{0. 5}Mn_{0. 5}O₃ 催化剂同时去除柴油机碳颗粒和NO_x 的性能

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