摘要
用共沉淀法制备钐锰复合氧化物催化剂,考察不同Sm掺量对Sm-MnO_(x)催化剂结构及其低温脱硝活性的影响规律。结果表明,Sm的不同掺量对催化剂物相组成、微观形貌、孔结构等有不同的影响。Sm/Mn最佳摩尔比为0.10,此时Mn^(2+)和Sm^(3+)可以均匀共沉淀,而得到Sm/Mn原子比接近0.1的钐锰复合氧化物球形结构;Sm掺量过低,不能很好改善锰氧化物的分散性;Sm掺量过高,部分Sm^(3+)会单独沉淀而使最终产物生成较多片状SmO晶体,降低催化剂脱硝性能。Sm/Mn摩尔比为0.10时,催化剂性能最佳,在100~240℃温度范围内,脱硝率保持在80%以上。
Sm-Mn mixed oxide catalysts were prepared through co-precipitation method,and the effects of different Sm content on the structure of Sm-MnO_(x) catalyst and its low temperature selective catalytic reduction(SCR)of NO_(x) with NH_(3) were investigated.The results showed that different amounts of Sm have different effects on the phase composition,micrograph and pore structure of the catalyst.The optimum molar ratio of Sm/Mn was 0.10,at this time,Mn^(2+) and Sm^(3+) could be uniformly co-precipitated,and the spherical structure of Sm-Mn mixed oxides with Sm/Mn atom ratio close to 0.1 was finally obtained.The low Sm content couldn’t improve the dispersion of manganese oxide very well,and the high content of Sm would produce a lamellar SmO crystal and reduce the de-NO_(x) performance of the catalyst.When the mole ratio of Sm/Mn is 0.10,the catalyst has the best performance,maintaining above 80% of the NO conversion at 100~240℃.
作者
康天红
谢峻林
刘小青
方德
公丕军
KANG Tian-hong;XIE Jun-lin;LIU Xiao-qing;FANG De;GONG Pi-jun(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
北大核心
2019年第2期13-18,共6页
Journal of Wuhan University of Technology
基金
国家重点研发计划专项资助(2017YFB0304304)
作者简介
康天红(1993-),女,硕士生.E-mail:kang_tianhong@126.com;通讯作者:刘小青(1969-),男,博士,副教授.E-mail:lczr@whut.edu.cn
