摘要
采用浸渍法制备了以Hβ分子筛为载体的负载氧化铜催化剂,考察了Cu负载量对催化剂NH3选择性催化还原NO反应(NH3-SCR)性能的影响,通过XRD、N2吸附-脱附、NH3-TPD、NO-TPD、H2-TPR、EDS和XPS等表征技术研究了催化剂的物理化学性质和SO_(2)存在条件下催化剂活性降低的原因。结果表明,反应气体不含SO_(2),Cu负载量为3%,即Cu(3)/Hβ催化剂有较高的反应活性,t95为169℃;反应气体含SO_(2),Cu负载量为2%时,即Cu(2)/Hβ催化剂的反应活性较好,t95为225℃。反应前后催化剂的分析结果表明,SO_(2)存在条件下催化剂活性降低的主要原因是在低温条件下,SO_(2)与NH3反应生成的硫铵盐覆盖了催化剂活性中心。
A series of Cu(x)/Hβcatalysts were prepared by the impregnation method and the effect on the performance of the catalysts for the selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR)was investigated.Characterization techniques such as XRD,N2 adsorption-desorption,NH_(3)-TPD,NO-TPD,H2-TPR,EDS and XPS were used to investigate the physical and chemical properties of the catalysts and the reason of the decrease of catalyst activity in the presence of SO_(2).It was shown that the catalyst Cu(3)/Hβ,the Cu loading was 3%and Cu(2)/Hβ,the Cu loading was 2%,exhibited the better catalytic activity when the initial reaction material contained no SO_(2)and SO_(2),and t95 was 169 and 225℃,respectively.The analysis results of the catalyst before and after the reaction showed that the main reason for the decrease of catalyst activity in the presence of SO_(2)was that the ammonium sulfur salt which was formed by the reaction of SO_(2)and NH_(3)in the low reaction temperature covers the catalyst active center.
作者
孙锦昌
任翠涛
赵明新
田春雨
迟姚玲
赵田田
王虹
SUN Jin-chang;REN Cui-tao;ZHAO Ming-xin;TIAN Chun-yu;CHI Yao-ling;ZHAO Tian-tian;WANG Hong(College of New Material and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,Beijing 102617,China;Beijing National Power Group CO.,LTd.Beijing 102206,China)
出处
《燃料化学学报（中英文）》
EI
CAS
CSCD
北大核心
2023年第6期823-831,共9页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(U1662103,2167329)资助。
