介质阻挡放电协同V2O5/微孔TiO2催化剂宽窗口脱硝

张宇晴; 孙朋琨; 童华

doi:10.13205/j.hjgc.202406010

介质阻挡放电协同V₂O₅/微孔TiO₂催化剂宽窗口脱硝

doi: 10.13205/j.hjgc.202406010

北京化工大学化学工程学院, 北京 100029

基金项目:

国家重点研发计划项目 (2020YFC1807902)

详细信息

作者简介:
张宇晴(1997-),女,硕士研究生,主要研究方向为大气污染控制工程。292918507@163.com

通讯作者:
童华(1970-),男,副教授,主要研究方向为大气污染控制工程,环境材料及固体废弃物资源化。tonghua@mail.buct.edu.cn

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出版历程
- 收稿日期: 2023-09-13
- 网络出版日期: 2024-07-11

WIDE WINDOW DENITRIFICATION OF V₂O₅/MICROPOROUS TiO₂ UNDER SYNERGISTIC EFFECT OF DIELECTRIC BARRIER DISCHARGE PLASMA

Department of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

摘要

摘要: 活性窗口窄是钒钛基催化剂在介质阻挡放电NH₃选择性催化还原(SCR)中的关键限制因素之一。采用水热法制备的V₂O₅/微孔TiO₂催化剂,在介质阻挡放电的协同作用下具有明显的宽NH₃-SCR活性窗口特征。通过对比空管、4V/TiO₂和该微孔载体钒钛催化剂室温下的催化性能,以及催化剂在N₂/O₂、N₂/O₂/NH₃、N₂/O₂/NO气氛下的反应行为,分析了该催化剂的催化反应机理,对微孔载体催化剂进行了硫水耐受性测试,并采用XRD、SEM、BET、XPS、TGA、FTIR等方法对材料的微观形貌结构特征等进行了分析。结果表明:4V/MP-TiO₂催化剂的脱硝效率较常规钒钛催化剂提高了33.68%,在243~442 J/L内均能保持80%以上的脱硝效率,在降低能耗的同时具有良好的耐硫、水性能。这是由于微孔TiO₂整体结构疏松,具有丰富的孔结构,改善了载体的孔容,提高了催化剂的分散性,为NH₃提供了更多的活性吸附位点,有利于拓宽活性窗口,同时微孔TiO₂提高了催化剂氧化NO的能力,有助于高能量密度区间快速SCR反应的进行。
- 介质阻挡放电 /
- 快速SCR /
- 钒钛基催化剂 /
- 微孔 /
- 脱硝
Abstract: The narrow active window is one of the key limitations for vanadium-titanium based catalysts in selective catalytic reduction of NO_x with NH₃ under dielectric barrier discharge. The V₂O₅/microporous TiO₂ catalyst prepared by the hydrothermal method exhibited obvious wide NH₃-SCR active window characteristics under the synergistic effect of dielectric barrier discharge. By comparing the catalytic performance of empty tubes, 4V/TiO₂, and the vanadium-titanium based catalyst with the microporous carrier at room temperature, as well as the reaction behavior of the catalyst in N₂/O₂, N₂/O₂/NH₃, N₂/O₂/NO atmosphere, the catalytic reaction mechanism of the catalyst was analyzed. The sulfur and water resistance of the microporous-carrier catalyst was tested, and the microstructure of the material was analyzed by XRD, SEM, BET, XPS, TGA and FTIR. The results showed that the denitrification efficiency of the 4V/MP-TiO₂ catalyst was increased by 33.68% compared to conventional vanadium-titanium catalysts, and it maintained a denitrification efficiency of more than 80% in the range of 243 J/L to 442 J/L. It has good sulfur and water resistance while reducing energy consumption. This is due to the loose overall structure of microporous TiO₂, which has a rich pore structure, improving the pore volume of the carrier, as well as the dispersion of the catalyst, and more active adsorption sites for NH₃, which is conducive to broadening the active window. At the same time, microporous TiO₂ enhances the ability of the catalyst to oxidize NO, which facilitates the rapid SCR reaction when the specific input energy is high.
- dielectric barrier discharge /
- fast SCR /
- vanadium-titanium based catalyst /
- micropore /
- denitrification

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