钒改性对铁基脱硝催化剂活性及抗碱性能的影响

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (8): 1511-1517.

钒改性对铁基脱硝催化剂活性及抗碱性能的影响

李悦^1,2,3, 姜宏^1,2,3, 蔡思翔^1,2,3

1.海南大学材料与科学工程学院,海口 570228;
2.海南大学,海南省特种玻璃实验室,海口 570228;
3.海南大学,南海海洋资源利用国家重点实验室,海口 570228

收稿日期:2021-04-25 出版日期:2021-08-15 发布日期:2021-09-14
通讯作者: 蔡思翔,博士,副教授。E-mail:993049@hainan.edu.cn
作者简介:李悦(1996—),女,河南省人,硕士研究生。E-mail:Lynne0519@shu.edu.cn
基金资助:
海南省青年基金(218MS004);中央引导地方科技发展专项资金(ZY2019HN0904);海南省重点研发计划(ZDYF2020015);海南大学科研平台建设(ZY2019HN09)

Effect of Vanadium Modification on the Activity and Alkali Resistance of Iron-Based de-NO_x Catalyst

LI Yue^1,2,3, JIANG Hong^1,2,3, CAI Sixiang^1,2,3

1. School of Material Science and Engineering, Hainan University, Haikou 570228, China;
2. Hainan Special Glass Key Lab, Hainan University, Haikou 570228, China;
3. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China

Received:2021-04-25 Online:2021-08-15 Published:2021-09-14

摘要/Abstract

摘要： 通过引入V物种对二氧化钛负载的铁基催化剂进行改性,制备出了FeV/TiO₂催化剂,并与未改性的铁基催化剂进行比较,通过X射线衍射(XRD)、拉曼光谱测试(Raman)、比表面积测试(BET)、紫外-可见-近红外漫反射光谱测试(UV-Vis-NIR)、氨气程序升温脱附(NH₃-TPD)以及氢气程序升温还原(H₂-TPR)等一系列测试对催化剂进行了表征。结果表明,引入V后的催化剂呈现出以FeVO₄为主相的状态,并存在大量的酸性位点而具有较强的表面酸性,Fe、V物种间的强相互作用大大提升了氧化还原性,因此催化剂低温活性得以显著提升且温度窗口大大拓宽。此外,催化剂的结构几乎不受碱中毒的影响,且在K中毒后仍能维持较强的表面酸性,具有良好的抗碱金属中毒性能。

关键词: 铁基催化剂, 钒改性, 低温活性, 抗碱, 表面酸性, 金属间强相互作用

Abstract: The FeV/TiO₂ catalyst was prepared by introducing V species to modify the iron-based catalyst, and the structures and performances were compared with the unmodified catalyst. The catalysts were characterized by means of XRD, Raman, BET, UV-Vis-NIR, NH₃-TPD and H₂-TPR. The results show that FeVO₄ exists as the main phase in the catalyst after introducing V, and there were abundant acid sites to guarantee strong surface acidity. The strong interaction between Fe and V species also greatly enhance the redox ability. Therefore, the low-temperature activity is significantly improved and the temperature window is greatly widened. Moreover, the structure of the catalyst is hardly affected by alkali poisoning, and the catalyst could still maintain strong surface acidity after poisoning, resulting in good resistance to alkali metals.

Key words: iron-based catalyst, vanadium modification, low-temperature activity, resistance to alkali, surface acidity, strong interaction between metal

中图分类号:

TQ426

李悦, 姜宏, 蔡思翔. 钒改性对铁基脱硝催化剂活性及抗碱性能的影响[J]. 人工晶体学报, 2021, 50(8): 1511-1517.

LI Yue, JIANG Hong, CAI Sixiang. Effect of Vanadium Modification on the Activity and Alkali Resistance of Iron-Based de-NO_x Catalyst[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(8): 1511-1517.

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