Jiang Qingyun, Li Yingying, Zhang Tianrui, Zhang Zhiping, Niu Xiaoyu, Zhu Yujun
Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin 150080, PR China.
Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin 150080, PR China.
J Hazard Mater. 2025 Sep 15;496:139294. doi: 10.1016/j.jhazmat.2025.139294. Epub 2025 Jul 17.
Alkali metal poisoning remains an essential issue causing the deactivation of vanadate-based catalysts for selective catalytic reduction (SCR) catalysts of NO with NH. In this paper, MnVO was loaded onto TiO (mwt%MnVO/TiO, m = 3, 5, 7) to improve the low-temperature activity and resistance to K poisoning. The activity tests demonstrated that 5 wt%MnVO/TiO catalyst was remarkably resistance to SO and HO, sustaining a NO conversion of over 90 % in the temperature range of 200-340 °C even after K poisoning. The mechanism of 5 wt%MnVO/TiO resistance to K was studied using a variety of characterizations. The findings showed that K tends to interact with TiO, preventing it from damaging the surface structure of MnVO and Mn active sites and therefore sustaining the redox cycle in SCR reaction. Furthermore, loading onto TiO enhanced the specific surface area and acidity of 5 wt%MnVO/TiO catalyst in comparison to MnVO, effectively minimizing the adverse impact of K poisoning on acidity and specific surface area while also assuring NH adsorption and activation. This study introduces a novel method to fabricate catalysts with superior alkali metal resistance.
碱金属中毒仍然是导致钒酸盐基氨选择性催化还原（SCR）催化剂失活的一个重要问题。本文将MnVO负载到TiO上（mwt%MnVO/TiO，m = 3、5、7），以提高其低温活性和抗钾中毒能力。活性测试表明，5 wt%MnVO/TiO催化剂对SO和HO具有显著抗性，即使在钾中毒后，在200 - 340 °C温度范围内仍能保持90 %以上的NO转化率。利用多种表征手段研究了5 wt%MnVO/TiO抗钾的机理。研究结果表明，钾倾向于与TiO相互作用，防止其破坏MnVO的表面结构和Mn活性位点，从而维持SCR反应中的氧化还原循环。此外，与MnVO相比，负载到TiO上提高了5 wt%MnVO/TiO催化剂的比表面积和酸度，有效降低了钾中毒对酸度和比表面积的不利影响，同时确保了NH的吸附和活化。本研究介绍了一种制备具有优异抗碱金属性能催化剂的新方法。
