Journal
NATIONAL SCIENCE REVIEW
Volume 8, Issue 10, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwab010
Keywords
environmental catalysis; Cu-SSZ-13; NH3-SCR; reaction mechanism; small-pore zeolites
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Funding
- National Natural Science Foundation of China [21637005, 21906172, 51822811, 51978640]
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This review article summarizes the major advances of Cu-SSZ-13 in the NH3-SCR reaction, including insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts. It proposes principles for designing zeolites with excellent performance and stability, while also addressing the challenges faced by Cu-based small-pore zeolites.
Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NOx with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology. The review gives a valuable summary of new insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.
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