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Volume 42 Issue 8
Aug.  2024
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Article Contents
ZHAO Lei, WANG Chuanyi, ZHANG Ting, LÜ Haiqin, YUAN Mingzhe. NH3-SCR PROPERTIES OF CeMn/ZSM-5 CATALYST MODIFIED BY ALKALI-TREATMENT[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 87-96. doi: 10.13205/j.hjgc.202408011
Citation: ZHAO Lei, WANG Chuanyi, ZHANG Ting, LÜ Haiqin, YUAN Mingzhe. NH3-SCR PROPERTIES OF CeMn/ZSM-5 CATALYST MODIFIED BY ALKALI-TREATMENT[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 87-96. doi: 10.13205/j.hjgc.202408011

NH3-SCR PROPERTIES OF CeMn/ZSM-5 CATALYST MODIFIED BY ALKALI-TREATMENT

doi: 10.13205/j.hjgc.202408011
  • Received Date: 2023-12-27
    Available Online: 2024-12-02
  • Nitrogen oxides, as one of the atmospheric pollutants, have caused serious environmental problems, endangering the ecological environment and human health. Selective catalytic reduction of NOx with ammonia (NH3-SCR) has become an important application technology for denitrification. Different from the supported ZSM-5 catalyst synthesized by traditional methods, Ce and Mn bimetallic modified ZSM-5 catalyst was synthesized by one-pot method, and the ZSM-5 molecular sieve was pretreated by alkali. The CeMn/ZSM-5-OH catalyst with improved surface area and pore structure was successfully synthesized. In the performance test, the NOx conversion rate was beyond 90% in the temperature range of 175 to 350 ℃, and the activity was increased by nearly 40%, compared with that of CeMn/ZSM-5 samples in low temperature section. After alkali-treatment, the CeMn/ZSM-5-OH catalyst generated more Ce3+ and Mn4+, which increased the adsorption performance of NO and NH3. The results of XPS showed that lattice oxygen participated in the electron transfer between Ce3+ and Mn4+, which was conducive to the activation of NO and NH3. Thus, the NH3-SCR reaction was promoted.
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