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• W4284993890 endingPage "154075" @default.
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• W4284993890 abstract "• Ammonia wet ion exchange method (AWIE) was useful for increasing ionic species and improving ion polymerization degree in traditional NaY (Si/Al = 2.5) zeolites. • The relationship between Cu, Co, Ni species and SCR performance was revealed for zeolite catalysts. • Moderate redox rate and strong acid sites were in favor of N 2 selectivity and high temperature activity for zeolite catalysts. Identifying the role of Cu, Co, or Ni species in exchanged zeolite catalysts by different preparation methods has been widely concerned for selective catalytic reduction by ammonia (NH 3 -SCR). Here, we found that ammonia wet ion exchange method (AWIE) was useful for increasing ionic species and improving ion polymerization degree in traditional NaY (Si/Al = 2.5) zeolites. Cu, Co, and Ni substituted Y zeolite prepared by AWIE method achieved better SCR performance than those by conventional wet ion exchange method (CWIE). Meanwhile, the coordination states and chemical environments of Cu, Co, and Ni exchanged species influenced the redox and adsorption properties of catalysts. Cu-NH 3 -IE catalyst had a wider SCR temperature window than Co-NH 3 -IE and Ni-NH 3 -IE catalysts owing to its more stable NH 3 adsorption, lower temperature, and smaller area of reduction peak. We proposed that the balance of NH 3 adsorption and oxidation in thermodynamics and kinetics was the key for high N 2 selectivity. This work provided a new idea for modifying the active sites of zeolite catalysts to achieve high activity and N 2 selectivity in a broad temperature window." @default.
• W4284993890 created "2022-07-11" @default.
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• W4284993890 date "2022-10-01" @default.
• W4284993890 modified "2023-09-27" @default.
• W4284993890 title "Cu, Co, or Ni species in exchanged Y zeolite catalysts and their denitration performance for selective catalytic reduction by ammonia" @default.
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• W4284993890 doi "https://doi.org/10.1016/j.apsusc.2022.154075" @default.
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