The sulfur and water resistance improvement of Pt/TiO2 catalyst for CO oxidation reaction by anatase and rutile TiO2 crystal interfaces

doi:10.1016/j.cjche.2025.03.019

中国化学工程学报 ›› 2025, Vol. 85 ›› Issue (9): 128-139.DOI: 10.1016/j.cjche.2025.03.019

The sulfur and water resistance improvement of Pt/TiO₂ catalyst for CO oxidation reaction by anatase and rutile TiO₂ crystal interfaces

Zhenxing Feng¹, Bin Song¹, Zongcheng Zhan², Lei Xu¹, Hanlei Sun¹, Shuo Yao¹, Hongzhi Wang¹, Licheng Liu¹

1. Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Qingdao Huashijie Environment Technology Co., Ltd., Qingdao 266510, China

收稿日期:2025-01-14 修回日期:2025-03-18 接受日期:2025-03-21 出版日期:2025-09-28 发布日期:2025-04-26
通讯作者: Licheng Liu,E-mail:liulicheng@ouc.edu.cn
基金资助:
This work was financially supported by the National Key Research & Development Program of China (2024YFC3908400), the National Natural Science Foundation of China (U21B2099) and Fundamental Research Funds for the Central Universities, Ocean University of China (202364004).

The sulfur and water resistance improvement of Pt/TiO₂ catalyst for CO oxidation reaction by anatase and rutile TiO₂ crystal interfaces

Zhenxing Feng¹, Bin Song¹, Zongcheng Zhan², Lei Xu¹, Hanlei Sun¹, Shuo Yao¹, Hongzhi Wang¹, Licheng Liu¹

1. Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Qingdao Huashijie Environment Technology Co., Ltd., Qingdao 266510, China

Received:2025-01-14 Revised:2025-03-18 Accepted:2025-03-21 Online:2025-09-28 Published:2025-04-26
Contact: Licheng Liu,E-mail:liulicheng@ouc.edu.cn
Supported by:
This work was financially supported by the National Key Research & Development Program of China (2024YFC3908400), the National Natural Science Foundation of China (U21B2099) and Fundamental Research Funds for the Central Universities, Ocean University of China (202364004).

摘要/Abstract

摘要： Catalytic oxidation is an effective strategy for eliminating CO pollutant. Pt/TiO₂ catalyst are one of the most active catalysts as used, but facing the issue of sulfur and water deactivation. In this study, TiO₂ was synthesized using a sol-gel method, while Pt/TiO₂ was prepared by impregnation method. By varying the calcination temperature of the TiO₂ support, Pt/TiO₂ catalysts with different proportions of anatase and rutile phases were synthesized. At the calcination temperature of 500 ℃, the catalysts exhibited approximately equal proportions of anatase and rutile, resulting in exceptional catalytic activity for CO oxidation, as well as improved resistance to sulfur and water in the flue gas. Consequently, the Pt/TiO₂-500 catalyst achieved a CO conversion of 93% at 160 ℃. Even under conditions of 8% (vol) H₂O and 0.016% (vol) SO₂ (GHSV = 300000 ml·h^-1·g^-1), the CO conversion remained above 95% at 220 ℃ for 46 h. The catalysts were characterized and analyzed using various techniques. The results indicated that anatase-phase TiO₂ exhibited weak CO adsorption capacity but strong SO₂ adsorption capacity, whereas rutile-phase TiO₂ demonstrated strong CO adsorption capacity and weak SO₂ adsorption capacity. The presence of the anatase phase mitigated the CO self-poisoning phenomenon of the catalyst, while the biphase interface reduced the adsorption and oxidation of SO₂ on the catalyst’s surface, significantly inhibiting the deposition of TiOSO₄. Consequently, the Pt/TiO₂-500 catalyst displayed the highest CO catalytic activity along with superior resistance to sulfur and water.

关键词: CO oxidation, Pt/TiO₂ catalysts, TiO₂ support, Crystal phase, Sulfur tolerance

Abstract: Catalytic oxidation is an effective strategy for eliminating CO pollutant. Pt/TiO₂ catalyst are one of the most active catalysts as used, but facing the issue of sulfur and water deactivation. In this study, TiO₂ was synthesized using a sol-gel method, while Pt/TiO₂ was prepared by impregnation method. By varying the calcination temperature of the TiO₂ support, Pt/TiO₂ catalysts with different proportions of anatase and rutile phases were synthesized. At the calcination temperature of 500 ℃, the catalysts exhibited approximately equal proportions of anatase and rutile, resulting in exceptional catalytic activity for CO oxidation, as well as improved resistance to sulfur and water in the flue gas. Consequently, the Pt/TiO₂-500 catalyst achieved a CO conversion of 93% at 160 ℃. Even under conditions of 8% (vol) H₂O and 0.016% (vol) SO₂ (GHSV = 300000 ml·h^-1·g^-1), the CO conversion remained above 95% at 220 ℃ for 46 h. The catalysts were characterized and analyzed using various techniques. The results indicated that anatase-phase TiO₂ exhibited weak CO adsorption capacity but strong SO₂ adsorption capacity, whereas rutile-phase TiO₂ demonstrated strong CO adsorption capacity and weak SO₂ adsorption capacity. The presence of the anatase phase mitigated the CO self-poisoning phenomenon of the catalyst, while the biphase interface reduced the adsorption and oxidation of SO₂ on the catalyst’s surface, significantly inhibiting the deposition of TiOSO₄. Consequently, the Pt/TiO₂-500 catalyst displayed the highest CO catalytic activity along with superior resistance to sulfur and water.

Key words: CO oxidation, Pt/TiO₂ catalysts, TiO₂ support, Crystal phase, Sulfur tolerance

Zhenxing Feng, Bin Song, Zongcheng Zhan, Lei Xu, Hanlei Sun, Shuo Yao, Hongzhi Wang, Licheng Liu. The sulfur and water resistance improvement of Pt/TiO₂ catalyst for CO oxidation reaction by anatase and rutile TiO₂ crystal interfaces[J]. 中国化学工程学报, 2025, 85(9): 128-139.

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The sulfur and water resistance improvement of Pt/TiO₂ catalyst for CO oxidation reaction by anatase and rutile TiO₂ crystal interfaces

The sulfur and water resistance improvement of Pt/TiO₂ catalyst for CO oxidation reaction by anatase and rutile TiO₂ crystal interfaces

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