化工进展 ›› 2023, Vol. 42 ›› Issue (S1): 542-548.DOI: 10.16085/j.issn.1000-6613.2023-0885

• 资源与环境化工 • 上一篇    下一篇

非贵金属改性钒钛基催化剂NH3-SCR脱硝协同控制VOCs

邓丽萍1(), 时好雨2, 刘霄龙2(), 陈瑶姬1, 严晶颖1   

  1. 1.浙江天地环保科技股份有限公司,浙江 杭州 310013
    2.中国科学院过程工程研究所,北京 100190
  • 收稿日期:2023-05-30 修回日期:2023-07-26 出版日期:2023-10-25 发布日期:2023-11-30
  • 通讯作者: 刘霄龙
  • 作者简介:邓丽萍(1991—),女,硕士,中级工程师,研究方向为有机废气污染治理。E-mail:dengliping@zjenergy.com.cn
  • 基金资助:
    浙江天地环保科技股份有限公司企业合作项目——焦化行业挥发性有机废气燃烧控制技术与装备开发(TD-KJ-20-017)

Non-noble metal modified vanadium titanium-based catalyst for NH3-SCR denitrification simultaneous control VOCs

DENG Liping1(), SHI Haoyu2, LIU Xiaolong2(), CHEN Yaoji1, YAN Jingying1   

  1. 1.Zhejiang Tiandi Environmental Protection Technology Company Limited, Hangzhou 310013, Zhejiang, China
    2.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2023-05-30 Revised:2023-07-26 Online:2023-10-25 Published:2023-11-30
  • Contact: LIU Xiaolong

摘要:

在钒钛基催化剂上分别负载四种非贵金属(Ce、Cu、Mn、Fe),研究改性催化剂对中低温选择性催化还原(SCR)脱硝协同挥发性有机物(VOCs)催化氧化的性能。对四种负载金属(Ce、Cu、Mn、Fe)分别进行SCR脱硝和VOCs催化氧化,发现Ce改性的催化剂在低温段具有良好的SCR脱硝活性和VOCs催化氧化性能,被认为具有良好的协同催化潜力。之后对Ce掺杂改性催化剂进行协同评价研究,发现在275~300℃的温度区间内,3V-5Ce/Ti催化剂的NO转化率和VOCs转化率可达到100%。并分别比较了SCR反应协同VOC与未协同VOC时N2的选择性和CO2的选择性,发现在低温段时甲苯的引入会显著降低N2选择性,而随着温度升高,N2O副产物的产生,N2的选择性恢复到未引入甲苯时。同时发现协同反应时CO2的选择性有明显下降。对3V-5Ce/Ti催化剂的SEM、XRD、XPS、NH3-TPD表征说明Ce的引入不会破坏载体形貌,可以为催化剂提高更多表面氧空位,从而提高催化剂的氧化还原性能,并提供更多弱酸位点作为反应位点。抗硫抗水及稳定性测试表明3V-5Ce/Ti催化剂具有良好的抗硫抗水性和稳定性。

关键词: 选择性催化还原, 挥发性有机构, 非贵金属, 催化剂, 协同催化

Abstract:

We loaded a variety of non-noble metal(Ce、Cu、Mn、Fe) on vanadium and titanium based catalysts, and studied the performance of the modified catalysts for the selective catalytic reduction (SCR) denitrification and the catalytic oxidation of volatile organic compounds (VOCs). The Ce modified catalyst showed good SCR denitrification activity and VOCs catalytic oxidation performance in the low temperature section, indicating its good cooperative catalytic potential. As for the Ce doping modified catalyst, the NO conversion rate and VOCs conversion rate over 3V-5Ce/Ti catalyst could reach 100% within the temperature range of 275—300℃. We compared the selectivity of N2 and CO2 between SCR-VOC and SCR alone, and found that the introduction of toluene significantly reduced N2 selectivity, which however was restored to the level without toluene after temperature rise. It was also found that a significant decrease in the selectivity of CO2 during the synergistic reaction. The SEM, XRD, XPS, NH3-TPD characterization of 3V-5Ce/Ti catalyst showed that the introduction of Ce provided more surface oxygen vacancies and more weak acid sites as reaction sites on the catalyst without changing the carrier morphology, and thus improved the redox performance of the catalyst. The resistance to water and stability tests showed that 3V-5Ce/Ti catalyst has good sulfur resistance, water resistance and stability.

Key words: selective catalytic reduction (SCR), volatile organic compounds (VOCs), non-noble metal, catalyst, concerted catalysis

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