Study on the SCR Activity and Resistance To Alkali Metal Poisoning of Nb-doped CeVWTi Catalyst

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-07-17 DOI:10.1007/s10562-025-05111-8

Jiahao Wei, Gonggang Sun, Tianzhu Shao, Mingyong Hou, Qi Wang, Xinbao Li

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Abstract

Alkali metals have severe detrimental effects on the SCR catalytic activity of V₂O₅-WO₃/TiO₂. Ce-modified is one of the more effective catalyst modification strategies currently available. Based on this, CeVWTi catalysts doped with different amounts of Nb were prepared and the resistance to alkali metals was tested to explore feasible solutions for mitigating alkali metal poisoning. The activity test results indicated that the doping of Nb had significant effects on the catalytic activity and alkali metal tolerance. The NO conversion of Nb_0.06CeVWTi reached 72.6% at 300 °C with a GHSV of 2 × 10⁵ h^− 1, which was 16.6% higher than that of the CeVWTi. After being poisoned by 1 wt% KCl, Nb_0.06CeVWTi still maintained 99.2% NO conversion at 350 °C. Characterization results showed that the redox capability of Nb_0.06CeVWTi was improved, and Nb_0.06CeVWTi maintained the redox performance to the maximum extent even after KCl loading.

Graphical Abstract

Abstract Image

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掺铌CeVWTi催化剂的SCR活性及抗碱金属中毒性能研究

碱金属对V2O5-WO3/TiO2的SCR催化活性有严重的不利影响。ce改性是目前较为有效的催化剂改性策略之一。在此基础上，制备了掺杂不同Nb量的CeVWTi催化剂，并对其抗碱金属性能进行了测试，探索减轻碱金属中毒的可行方案。活性测试结果表明，Nb的掺杂对催化活性和碱金属耐受性有显著影响。在300℃条件下，Nb0.06CeVWTi的NO转化率达到72.6%，GHSV为2 × 105 h−1，比CeVWTi提高了16.6%。Nb0.06CeVWTi经1wt % KCl中毒后，在350℃时仍能保持99.2%的NO转化率。表征结果表明，Nb0.06CeVWTi的氧化还原能力得到了提高，且Nb0.06CeVWTi在加载KCl后仍能最大程度地保持氧化还原性能。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.