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钙钛矿型催化剂La1-xSrxMn0.95Ni0.05O3氨气选择性催化还原NO

阿荣塔娜1,2,3,李永红1,2,3,李晓良1,2,3   

  1. 1天津大学化工学院,天津 300072;2精馏技术国家工程研究中心,天津 300072;3绿色合成与转化教育部重点实验室,天津 300072
  • 出版日期:2014-04-05 发布日期:2014-04-05

Perovskite catalyst La1-xSrxMn0.95Ni0.05O3 for selective catalytic reduction of NO by NH3

A Rongtana1,2,3,LI Yonghong 1,2,3,LI Xiaoliang1,2,3   

  1. 1 School of Chemical Engineering,Tianjin University,Tianjin 300072,China;2National Engineering Research Center for Distillation Technology,Tianjin 300072,China;3Key Laboratory for Green Chemical Technology of Ministry of Education,Tianjin 300072,China
  • Online:2014-04-05 Published:2014-04-05

摘要: 采用柠檬酸络合法制备了钙钛矿型催化剂La1-xSrxMn0.95Ni0.05O3,用XRD、BET、NH3-TPD等对催化剂的组成、结构进行表征。将该催化剂应用于NH3 选择性催化还原 NO 反应中,考察了锶掺杂量对SCR催化活性的影响。结果表明,该催化剂在 100~350 ℃ 范围内表现出良好的催化活性,锶取代量x为0.6 时,NO转化率最高,达到了95% 以上。此外,为了提高低温SCR活性和抗水抗硫性能,A位双取代锶和铈元素,显著提高了低温催化活性和抗水耐硫性能。

关键词: 钙钛矿, 催化剂, 制备, 选择性催化还原

Abstract: Perovskite catalysts La1-xSrxMn0.95Ni0.05O3 were prepared by the citric acid complexing method and used for selective catalytic reduction of NO by NH3 (NH3 -SCR). The sample was characterized by XRD,BET and NH3-TPD. Since NO conversion was found to depend strongly on the degree of strontium substitution,catalytic activities were computed for La1-xSrxMn0.95Ni0.05O3 series and when x=0.6,the SCR catalyst achieved the maximum NO conversion of 95%. In addition,double substitution of two ions Sr2+and Ce4+ at A-site was found to exhibit better low-temperature catalytic activities and water-sulfur dioxide resistance.

Key words: perovskite, catalyst, preparation, selective catalytic reduction

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