Catalytic removal of NO x and N2O over combined V2O5/TiO2 and Cs/Co3O4 catalysts

MIAO Jingwen; FAN Xing; LIU Ruowen; ZHANG Yakun

doi:10.13205/j.hjgc.202602012

Volume 44 Issue 2

Feb. 2026

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MIAO Jingwen, FAN Xing, LIU Ruowen, ZHANG Yakun. Catalytic removal of NO x and N2O over combined V2O5/TiO2 and Cs/Co3O4 catalysts[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(2): 103-111. doi: 10.13205/j.hjgc.202602012

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MIAO Jingwen, FAN Xing, LIU Ruowen, ZHANG Yakun. Catalytic removal of NO _x and N₂O over combined V₂O₅/TiO₂ and Cs/Co₃O₄ catalysts[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(2): 103-111. doi: 10.13205/j.hjgc.202602012

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Catalytic removal of NO _x and N₂O over combined V₂O₅/TiO₂ and Cs/Co₃O₄ catalysts

doi: 10.13205/j.hjgc.202602012

1. College of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China

Received Date: 2025-01-11
Available Online: 2026-04-11
Publish Date: 2026-02-01

Abstract

Abstract

Aiming at efficiently removing NO _x and N₂O from the tail gas of nitric acid production， a technique route of catalytic reduction of NO _x followed by catalytic decomposition of N₂O was proposed. NO _x reduction over V₂O₅/TiO₂ catalyst and N₂O decomposition over Co₃O₄-based catalysts were separately investigated. The combined removal of NO _x and N₂O was then investigated by connecting the V₂O₅/TiO₂ catalyst with the optimized 2.0Cs/Co₃O₄ catalyst in series. Physicochemical characteristics of the catalysts were characterized by N₂ adsorption-desorption， XRD， XPS， and O₂-TPD techniques. The results showed that， for NO _x reduction over the V₂O₅/TiO₂ catalyst， the presence of 2% H₂O in the feed gas could broaden the active temperature window of the catalyst， improve the N₂ selectivity， and inhibit the formation of N₂O. By loading 2.0% Cs on Co₃O₄， the N₂O decomposition was greatly improved， which might be explained by the reduction of some Co³⁺ to Co²⁺ and the formation of more oxygen vacancies on the catalyst surface， due to the introduction of Cs. At high temperatures （400 ℃）. the presence of 2.0% H₂O in the feed gas showed weak inhibitory effects on the decomposition of N₂O over the 2.0Cs/Co₃O₄ catalyst， while the coexistence of 2% H₂O and 50×10^-6 NO significantly deactivated the 2.0Cs/Co₃O₄ catalyst. When the two-stage catalyst， consisting of upstream V₂O₅/TiO₂ and downstream 2.0Cs/Co₃O₄ catalyst， was used to remove NO _x and N₂O， NO _x was mainly reduced over the V₂O₅/TiO₂ catalyst， with limited influence from the presence of N₂O. In the temperature range for efficient removal of NO _x （and NH₃） over the V₂O₅/TiO₂ catalyst， N₂O could be stably decomposed over the downstream 2.0Cs/Co₃O₄ catalyst. With 2% H₂O contained in the feed gas， complete conversion of NO _x and NH₃ was achieved at 400 ℃， whereas the conversion of N₂O reached 61.3%.
- NO _x reduction,
- N₂O decomposition,
- V₂O₅/TiO₂,
- Cs/Co₃O₄,
- combined catalysis

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References(35)

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