金属改性对SAPO-34低温还原NO性能的影响  

Effect of metal modification on low-temperature catalytic properties of SAPO-34 for NO reduction

作　　者：洪志铭 刘坤 刘劲周[4] 徐志兵 唐雪娇 王晋刚[4] 金陶胜[2,3] HONG Zhiming;LIU Kun;LIU Jinzhou;XU Zhibing;TANG Xuejiao;WANG Jingang;JIN Taosheng(College of Resource&Environment,Anqing Normal University,Anqing 246000;College of Environmental Science and Engineering,Nankai University,Tianjin 300350;Center for Urban Transport Emission Research,State Environment Protection Key Laboratory of Urban Particulate Air Pollution Prevention,Nankai University,Tianjin 300350;School of Chemical Engineering,Hebei University of Technology,Tianjin 300130)

机构地区：[1]安庆师范大学资源环境学院,安庆246000 [2]南开大学环境科学与工程学院,天津300350 [3]南开大学,城市交通排放研究中心,国家环境保护城市空气颗粒物污染防治重点实验室,天津300350 [4]河北工业大学化工学院,天津300130

出　　处：《环境科学学报》2020年第6期2019-2024,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21477057);国家重点研发计划(No.SQ2019YFC040023)。

摘　　要：采用浸渍法制备金属改性SAPO-34分子筛催化剂,分析比较了不同单金属(Cu或Co)及不同比例双金属(Cu∶Co=1∶1、3∶1、5∶1,质量比)改性催化剂对NO的催化还原性能,评价了不同催化剂的N2选择性,并采用扫描电子显微镜(SEM)、比表面积测试、X射线衍射分析(XRD)、NH3-程序升温脱附(NH3-TPD)等表征手段对催化剂的物化性能进行了分析.结果表明,单金属Cu改性催化剂具有较宽的温度区间,在250~450℃范围内NO的转化率始终保持在100%;双金属改性使NO转化率保持为100%的最低温度下降了25~50℃,显著拓宽了低温段窗口,其中,Cu3Co1/SAPO-34催化剂的低温催化还原性能最好,200℃即可实现100%的NO转化率,175℃下的转化率也高达80%以上.Cu-Co双金属改性SAPO-34分子筛催化剂具有优异的低温催化还原NO性能,具有在机动车尾气、工业废气的低温脱硝治理领域应用的潜力.In this study,the metal modified SAPO-34 molecular sieve catalysts were produced by impregnation,and their effects on NO reduction were investigated.The physicochemical properties of the catalyst were characterized by scanning electron microscopy(SEM),specific surface area test,X-ray diffraction analysis(XRD),and NH3-temperature programmed desorption test(NH3-TPD).In addition,N2 selectivity of different catalysts were estimated.The results showed that the conversion efficiency of NO of single metal Cu modified catalyst was always 100%at 250 to 450℃,and the bimetal modification could lower the minimum temperature of 100%conversion efficiency by 25 to 50℃.Cu3Co1/SAPO-34 had the best low temperature catalytic effect,with 100%NO conversion efficiency at 200℃and 90%NO conversion efficiency at 175℃.Our study indicated the good low temperature denitrification of Cu-Co modified SAPO-34 molecular sieve catalysts,which could be applied in the pollution control on vehicle exhaust and industrial waste gas.

关 键 词：SAPO-34 金属改性 低温脱硝 选择性催化还原 

分 类 号：X701.7[环境科学与工程—环境工程]