Synergistic purification performance of NiMnAlO/ZSM-5 catalyst for NO and ethyl acetate

ZHAO Danya; CHENG Yue; NIU Xinyu; GUO Jing; ZHOU Jiti; ZHAO Ling

doi:10.13205/j.hjgc.202610015

Volume 44 Issue 10

Oct. 2026

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ZHAO Danya, CHENG Yue, NIU Xinyu, GUO Jing, ZHOU Jiti, ZHAO Ling. Synergistic purification performance of NiMnAlO/ZSM-5 catalyst for NO and ethyl acetate[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(10): 143-154. doi: 10.13205/j.hjgc.202610015

Citation:

ZHAO Danya, CHENG Yue, NIU Xinyu, GUO Jing, ZHOU Jiti, ZHAO Ling. Synergistic purification performance of NiMnAlO/ZSM-5 catalyst for NO and ethyl acetate[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(10): 143-154. doi: 10.13205/j.hjgc.202610015

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Synergistic purification performance of NiMnAlO/ZSM-5 catalyst for NO and ethyl acetate

doi: 10.13205/j.hjgc.202610015

1. College of Ecology and Environment, Inner Mongolia University, Hohhot 010031, China;
2. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Dalian 116024, China

Received Date: 2026-07-20
Available Online: 2026-11-10

Abstract

Abstract

To address the challenges associated with the synergistic removal of NO_x and volatile organic compounds （VOCs） from industrial exhaust gases， including the mismatch between reaction requirements and the lack of multifunctional catalysts， a bifunctional Ni₁Mn₅AlO/ZSM-5 catalyst was prepared by integrating NiMnAlO oxide with ZSM-5 zeolite. With CO as the reducing agent and ethyl acetate as a model VOC， the catalytic performance of the composite was evaluated in a coupled system integrating CO-SCR and VOCs catalytic oxidation. The results demonstrated that the Ni₁Mn₅AlO/ZSM-5 catalyst exhibited superior NO reduction and ethyl acetate oxidation activities compared with pristine Ni₁Mn₅AlO and ZSM-5. By optimizing the Si/Al ratio of ZSM-5， the Ni₁Mn₅AlO/ZSM-5（Si/Al ratio=41.7） catalyst achieved the best overall catalytic performance， delivering an NO conversion rate of 71.6% at 350 ℃ and a T₉₀ of 216 ℃ for ethyl acetate oxidation in a mixed atmosphere containing CO， NO， ethyl acetate， and O₂. Characterization results indicated that the composite catalyst exhibited a microporous-mesoporous structure， and the number of acidic sites on the catalyst surface was significantly enhanced. Meanwhile， the ZSM-5 support regulated the electronic structure of Ni and Mn species， promoted the formation of Mn³⁺ active species， and optimized the balance between surface oxygen species and oxygen vacancies， thereby enhancing the redox capability of the catalyst. Kinetic analysis and in situ FTIR results indicated that CO acted as a reducing agent in the CO-SCR process to promote NO conversion while maintaining the surface redox cycle of the catalyst. Ethyl acetate was activated on acidi sites and subsequently oxidized through oxygen-containing intermediates， enabling the synergistic removal of NO and VOCs. This study provides new insights into the design of bifunctional catalysts for the simultaneous purification of multiple pollutants in complex industrial exhaust gases.
- CO-SCR,
- ethyl acetate,
- NiMnAlO/ZSM-5,
- synergistic purification

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References(37)

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