应用化学 ›› 2023, Vol. 40 ›› Issue (5): 697-707.DOI: 10.19894/j.issn.1000-0518.220315

• 研究论文 • 上一篇    下一篇

高氧空位尖晶石型锰基催化剂用于低温NH3-SCR反应

伍凡1,2, 田贺元1,2, 刘鹏1,2, 孙立伟1(), 张一波2,3(), 杨向光1,2,3()   

  1. 1.中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,吉林省绿色化学与过程重点实验室,长春 130022
    2.中国科学技术大学,合肥 230026
    3.中国科学院赣江创新研究院,赣州 341000
  • 收稿日期:2022-09-27 接受日期:2023-03-27 出版日期:2023-05-01 发布日期:2023-05-26
  • 通讯作者: 孙立伟,张一波,杨向光
  • 基金资助:
    国家自然科学基金项目(22072141);中国科学院青年创新促进会人才项目(2018263);江西省双千计划(青年)项目(jxsq2020101047);中国科学院重点部署项目(ZDRW-CN-2021-3);中国科学院赣江创新研究院自主部署项目(E055C003)

Spinel Mangane-Based Catalysts with High Oxygen Vacancy Used for NH3-SCR Reaction at Low Temperature

Fan WU1,2, He-Yuan TIAN1,2, Peng LIU1,2, Li-Wei SUN1(), Yi-Bo ZHANG2,3(), Xiang-Guang YANG1,2,3()   

  1. 1.State Key Laboratory of Rare Earth Resource Utilization,Jilin Province Key Laboratory of Green Chemistry and Process,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Science and Technology of China,Hefei 230026,China
    3.Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China
  • Received:2022-09-27 Accepted:2023-03-27 Published:2023-05-01 Online:2023-05-26
  • Contact: Li-Wei SUN,Yi-Bo ZHANG,Xiang-Guang YANG
  • About author:xgyang@gia.cas.cn
    yibozhang@gia.cas.cn
    liweisun@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22072141);the Youth Innovation Promotion Association of Chinese Academy of Sciences(2018263);Jiangxi Province “Double Thousand Plan”(jxsq2020101047);the Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-3);the Self-deployed Projects of Ganjiang Innovation Academy, Chinese Academy of Sciences(E055C003)

摘要:

制备了LiMn2O4、ZnMn2O4和CrMn2O4尖晶石型复合氧化物,测试了它们在50~450 ℃的氨择性催化还原(NH3-SCR)氮氧化合物的活性,并考察了结构、不同金属元素和价态对NH3-SCR活性的影响。使用物理吸附仪(BET)、X射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线光电子能谱分析仪(XPS)、NH3程序升温脱附(NH3-TPD)和H2程序升温还原(H2-TPR)等对催化剂进行了表征,并对尖晶石催化剂的构效关系进行了研究。结果表明,活性最佳的LiMn2O4尖晶石催化剂在空速为6×104 mL/(g?h),反应温度为150 ℃时有90%以上的NO转化率,且在100~400 ℃的温度范围内显示出80%以上的NO转化率,低温活性非常好,活性温度范围宽,而ZnMn2O4和CrMn2O4的脱硝活性则稍差,且二者的活性相近。在有水汽的条件下,LiMn2O4活性下降幅度较大,而ZnMn2O4和CrMn2O4活性只稍有下降,抗水性能较好。ZnMn2O4在150 ℃时转化率达90%,有水汽的条件下则比CrMn2O4活性更好。尖晶石ZnMn2O4在较宽的温度范围内有较好的NO转化率,且抗水性能强,具有较为良好的实用价值。

关键词: 选择性催化还原, 氨, 氮氧化物, 尖晶石氧化物, 低温脱硝, 废气处理

Abstract:

Different spinel composite oxide catalysts, LiMn2O4, ZnMn2O4 and CrMn2O4 are prepared and activities of the catalysts for selective catalytic reduction of NO x by NH3 (NH3-SCR) are tested at 50~450 ℃. The effects of catalyst structure, metal elements and valence states on NH3-SCR activity are investigated. The catalysts are characterized by physical adsorption instrument (BET), X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), NH3 temperature-programmed desorption (NH3-TPD) and H2 temperature-programmed reduction (H2-TPR),etc. The structure-activity relationship of spinel catalyst is also studied. The results show that: The LiMn2O4 spinel catalyst has the best activity with more than 90% NO conversion at the space velocity of 6×104 mL/(g?h) at 150 ℃, and it shows more than 80% NO conversion at 100~400 ℃, demonstrating good low temperature activity and wide temperature range. However, the denitrification activity of ZnMn2O4 and CrMn2O4 is relative poor, and the two have similar activities. In the presence of water, the activity of LiMn2O4 decreased greatly, while the activities of ZnMn2O4 and CrMn2O4 decreases slightly, showing better water resistance. The conversion rate of ZnMn2O4 reach 90% at 150 ℃, which is better than that of CrMn2O4 in the presence of water. Spinel ZnMn2O4 has a good NO conversion rate in a wide temperature range and strong water resistance.

Key words: Selective catalytic reduction, Ammonia, Nitrogen oxide, Spinel oxide, Low temperature denitrification, Waste gas treatment

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