V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NO x 和N2O

苗静文; 樊星; 刘若雯; 张雅坤

doi:10.13205/j.hjgc.202602012

V₂O₅/TiO₂和Cs/Co₃O₄催化剂联合催化脱除NO _x 和N₂O

doi: 10.13205/j.hjgc.202602012

苗静文¹,
樊星^1,2, ,,
刘若雯¹,
张雅坤¹

1. 北京工业大学环境科学与工程学院, 北京 100124;
2. 北京工业大学区域大气复合污染防治北京市重点实验室, 北京 100124

基金项目:

国家自然科学基金项目（21707004）；北京市自然科学基金项目（8152011）

详细信息

作者简介:
苗静文（1998—），女，硕士研究生，主要研究方向为催化脱除NO_x和N₂O。miaojingwen1998@163.com

通讯作者:
樊星（1985—），女，博士，副教授，主要研究方向为大气污染控制理论与技术。fanxing@bjut.edu.cn

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出版历程
- 收稿日期: 2025-01-11
- 网络出版日期: 2026-04-11
- 刊出日期: 2026-02-01

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

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

摘要

摘要: 针对高效脱除硝酸生产尾气中NO _x 和N₂O的需求，提出了先催化NO _x 还原后催化N₂O分解的技术路线。分别考察了V₂O₅/TiO₂和Co₃O₄基催化剂催化NO _x 还原和N₂O分解的性能，在优选出2.0Cs/Co₃O₄催化剂的基础上，重点考察了在V₂O₅/TiO₂催化剂之后串接2.0Cs/Co₃O₄催化剂的联合催化脱除NO _x 和N₂O的性能，并采用N₂吸脱附、XRD、XPS和O₂-TPD等手段对催化剂理化特性进行表征。结果表明：V₂O₅/TiO₂催化还原NO _x 时，进气中含2% H₂O有利于拓宽活性温度窗口和提高N₂选择性，以及抑制N₂O形成。在Co₃O₄表面负载2.0% Cs显著提高了催化剂催化N₂O分解性能，这可能与Cs的引入导致部分Co³⁺还原为Co²⁺以及催化剂表面形成了更多氧空位有关。高温（400 ℃）下通入2% H₂O对2.0Cs/Co₃O₄催化N₂O分解的抑制作用较弱，但同时通入2% H₂O和50×10^-6 NO显著抑制了2.0Cs/Co₃O₄催化剂的活性。采用先V₂O₅/TiO₂后2.0Cs/Co₃O₄的两段式催化剂联合脱除NO _x 和N₂O时，前端的V₂O₅/TiO₂催化剂主要催化NO _x 的还原反应，N₂O对脱硝过程的影响有限；在V₂O₅/TiO₂催化剂高效脱除NO _x （和NH₃）的温度范围内，后端的2.0Cs/Co₃O₄催化剂可较为稳定地催化N₂O分解；在温度400 ℃，进气中含2% H₂O时，NO _x 和NH₃转化率均接近100%，N₂O转化率为61.3%。
- NO _x 还原 /
- N₂O分解 /
- V₂O₅/TiO₂ /
- Cs/Co₃O₄ /
- 联合催化
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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