Effect of Nb-doping on the MnFeOx catalyst for NH3-SCR reaction at low-temperature

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Journal of chemical technology and biotechnology Pub Date : 2024-06-12 DOI:10.1002/jctb.7692
Zhenzhao Pei, Haiyang Zhao, Haipeng Wang, Zhuyue Fu, Kanghua Yang, Kang Mao, Yan Liu
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Abstract

BACKGROUND

Manganese-based catalysts were considered the most promising catalysts for low-temperature selective catalytic reduction (NH3-SCR) reactions. In this work, a series of Mn3Fe2NbyOx catalysts were synthesized by co-precipitation method for low-temperature NH3-SCR and SO2 tolerance tests.

RESULTS

The catalysts were characterized by BET, SEM, XRD, XPS, H2-TPR, and NH3-TPD. Mn3Fe2Nb0.01Ox exhibited exceptionally high activity with a conversion of almost 100% from 80°C to 240°C, and a NO conversion of more than 75% at 40°C, while the NO conversion at 140°C in the presence of 100 ppm SO2 remained above 90% for 4 h.

CONCLUSION

According to the characterization results, Nb modification can expand the specific surface area of the catalyst, improve the structure of the catalyst, and make the active components on the catalyst surface more dispersed. Moreover, the Nb-modified catalyst reduced the content of Mn2+ on the catalyst surface and strengthened the electronic interactions between elements. The synergistic effects among Mn, Fe, and Nb facilitate the formation of more chemically adsorbed oxygen, which enhances the reduction capacity of the catalyst. This facilitates the adsorption of NH3 by the catalyst at low temperatures and promotes the process of low-temperature NH3-SCR reaction. More importantly, the Nb-modified catalyst possessed more weak acid sites, and the higher surface acidity was conducive to the inhibition of SO3 generation, which enhanced the sulfur poisoning resistance of the catalyst. © 2024 Society of Chemical Industry (SCI).

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掺杂铌对低温 NH3-SCR 反应 MnFeOx 催化剂的影响
锰基催化剂被认为是最有希望用于低温选择性催化还原(NH3-SCR)反应的催化剂。本研究采用共沉淀法合成了一系列 Mn3Fe2NbyOx 催化剂,用于低温 NH3-SCR 和二氧化硫耐受性试验,并通过 BET、SEM、XRD、XPS、H2-TPR 和 NH3-TPD 对催化剂进行了表征。Mn3Fe2Nb0.01Ox 表现出极高的活性,在 80°C 至 240°C 的温度范围内,转化率几乎达到 100%;在 40°C 的温度范围内,氮氧化物转化率超过 75%;在 140°C 的温度范围内,100 ppm SO2 存在下,氮氧化物转化率在 4 小时内保持在 90% 以上。此外,Nb 改性催化剂降低了催化剂表面 Mn2+ 的含量,加强了元素间的电子相互作用。锰、铁和铌之间的协同效应促进了更多化学吸附氧的形成,从而提高了催化剂的还原能力。这有利于催化剂在低温下吸附 NH3,促进低温 NH3-SCR 反应的进程。更重要的是,Nb 改性催化剂具有更多的弱酸位点,较高的表面酸度有利于抑制 SO3 的生成,从而增强了催化剂的抗硫毒性能。© 2024 化学工业学会(SCI)。
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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
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