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Promoted NH_(3)-SCR activity and hydrothermal stability of cu-ssz-50 catalyst synthesized by one-pot method

Chinese Chemical Letters 2024年第3期35卷 135-139页

作者： Jinpeng Du Jingyi Wang Yulong Shan Shichao Han Wenpo Shan Hong He Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationInstitute of Urban EnvironmentChinese Academy of SciencesNingbo 315800China University of Chinese Academy of Sciences Beijing 100049China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Nitrogen oxide(NO_(x))is one of the most critical contaminants in the air,and the control of NO_(x)emission from diesel vehicles is very ***-based small-pore zeolites have already been applied for NO_(x)abatement on diesel *** the small-pore zeolites,cu-ssz-50 catalysts with good NH_(3)-SCR catalytic activity were believed to have potential for *** this study,a one-pot synthesis method for cu-ssz-50 catalysts was developed for the first time,using the co-templates of cu-TEPA and 2,6-dimethyl-N-methylpyridinium *** this synthesis method,cu-ssz-50 with various cu contents can be obtained by adjusting the amount of cu-TEPA without the need for a further after-treatment *** addition of cu-TEPA affected the framework atoms and cu species,and a lower Si/Al ratio and more SCR active cu species were *** synthesized catalyst with a cu/Al ratio of 0.40 exhibited over 90%NO_(x)conversion between 200℃and 450℃for the selective catalytic reduction of NO_(x)with NH_(3)(NH_(3)-SCR).Meanwhile,over 80%NO_(x)conversion could be obtained from 250℃to 450℃after hydrothermal aging at 750℃for 16 *** addition,both L-H and E-R mechanisms were proven to exist for the one-pot-synthesized cu-ssz-50 by in situ DRIFTS *** simple synthesis procedure,excellent catalytic activity and hydrothermal stability brighten the prospects for the application of cu-ssz-50.

关键词： NH_(3)-SCR cu-ssz-50 One-pot synthesis Si/Al ratio cu species distribution Reaction mechanism

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