Cu含量对Cu/ZSM-5催化剂氨选择性催化还原NO影响的研究
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摘要
采用浸渍法将铜(Cu)负载在ZSM-5分子筛上,制备了一系列不同Cu含量的Cu/ZSM-5分子筛催化剂。对ZSM-5及Cu/ZSM-5分子筛催化剂的氨选择性催化还原一氧化氮(NO)性能进行评价,并对Cu/ZSM-5分子筛催化剂进行表征分析。结果表明,Cu含量变化对Cu/ZSM-5分子筛催化剂的氨选择性催化还原反应(NH3-SCR)活性影响较大,Cu含量为0.75%(wt,质量分数)制得的Cu/ZSM-5具有最佳的中低温活性,在190℃条件下对NO的转化率为91%。
Cu/ZSM-5 catalysts with different copper loadings were prepared by impregnation method.The performances of ZSM-5 and Cu/ZSM-5 catalysts in selective catalytic reduction of nitric oxide(NO)with ammonia(NH3)were investigated and the physicochemical properties of samples were characterized by XRD,XPS,BET,H2-TPR and NH3-TPD.The change of copper content was important to the activity of Cu/ZSM-5 catalysts for selective catalytic reduction with ammonia(NH3-SCR).The sample with copper content of 0.75 wt% obtained the best activity at medium and low temperatures,its conversion of NO reached 91% at 190℃.
Cu/ZSM-5 catalysts with different copper loadings were prepared by impregnation method.The performances of ZSM-5 and Cu/ZSM-5 catalysts in selective catalytic reduction of nitric oxide(NO)with ammonia(NH3)were investigated and the physicochemical properties of samples were characterized by XRD,XPS,BET,H2-TPR and NH3-TPD.The change of copper content was important to the activity of Cu/ZSM-5 catalysts for selective catalytic reduction with ammonia(NH3-SCR).The sample with copper content of 0.75 wt% obtained the best activity at medium and low temperatures,its conversion of NO reached 91% at 190℃.
引文
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[12]苏潜,黄妍,张颖,等.铜源对Cu-SAPO-34氨催化还原NO性能的影响[J].分子催化,2016,30(2):151-158.
[13]Dou B,Lv G,Wang C,et al.Cerium doped copper/ZSM-5catalysts used for the catalytic reduction of nitrogen oxide with ammonia[J].Chemical Engineering Journal,2015,270(2):549-556.
[2]Wang D,Jangjou Y,Liu Y,et al.A comparison of hydrothermal aging effects on NH3-SCR of NOx over Cu-SSZ-13and Cu-SAPO-34catalysts[J].Applied Catalysis B(Environmental),2015,165:438-445.
[3]Chen Z,Yang Q,Li H,et al.Cr-MnOx mixed-oxide catalysts for selective catalytic reduction of NOx with NH3at low temperature[J].Journal of Catalysis,2010,276(1):56-65.
[4]Barndenberger S,Krocher O,Tissler A,et al.The determination of the activities of different iron species in Fe-ZSM-5for SCR of NO by NH3[J].Applied Catalysis B(Environmental),2010,95(3/4):348-357.
[5]Vennestrom P N R,Janssens T V W,Kustov A,et al.Influence of lattice stability on hydrothermal deactivation of CuZSM-5and Cu-IM-5zeolites for selective catalytic reduction of NOxby NH3[J].Journal of Catalysis,2014,309(6):477-490.
[6]Han S,Ye Q,Cheng S Y,et al.Effect of the hydrothermal aging temperature and Cu/Al ratio on the hydrothermal stability of CuSSZ-13catalysts for NH3-SCR[J].Catalysis Science&Technology,2017,7(3):703-717.
[7]Bin F,Song C L,Lv G,et al.Selective catalytic reduction of nitric oxide with ammonia over zirconium-doped copper/ZSM-5catalysts[J].Applied Catalysis B(Environmental),2014,150/151:532-543.
[8]Wang T,Liu H,Zhang X Y,et al.A plasma-assisted catalytic system for NO removal over CuCe/ZSM-5catalysts at ambient temperature[J].Fuel Processing Technology,2017,158:199-205.
[9]Kwak J H,Zhu H,Lee J H,et al.Two different cationic positions in Cu-SSZ-13?[J].Chemical Communications,2012,48(39):4758-4760.
[10]Tan P L,Leung Y L,Lai S Y,et al.The effect of calcinations temperature on the catalytic performance of 2wt.%Mo/HZSM-5in methane aromatization[J].Applied Catalysis AGeneral,2002,228(1):115-125.
[11]王坤鹏,宋崇林,宾峰,等.Cu/ZSM-5分子筛催化剂SCR催化性能[J].燃烧科学与技术,2012,18(1):73-78.
[12]苏潜,黄妍,张颖,等.铜源对Cu-SAPO-34氨催化还原NO性能的影响[J].分子催化,2016,30(2):151-158.
[13]Dou B,Lv G,Wang C,et al.Cerium doped copper/ZSM-5catalysts used for the catalytic reduction of nitrogen oxide with ammonia[J].Chemical Engineering Journal,2015,270(2):549-556.