Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts
Ce-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because of their good catalytic performance and environmental friendliness. However, the mechanism of alkali metal poisoning in Ce-based catalysts remains to be further studied. This work involves the...
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2024-11-01
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| Series: | Molecules |
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| author | Mutao Xu Yuhang Deng Xingxiu Gao Qijie Jin Wei Yan Liguo Chen Jian Yang Jing Song Changcheng Zhou Haitao Xu |
| author_facet | Mutao Xu Yuhang Deng Xingxiu Gao Qijie Jin Wei Yan Liguo Chen Jian Yang Jing Song Changcheng Zhou Haitao Xu |
| author_sort | Mutao Xu |
| collection | DOAJ |
| description | Ce-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because of their good catalytic performance and environmental friendliness. However, the mechanism of alkali metal poisoning in Ce-based catalysts remains to be further studied. This work involves the preparation of the K/Na-poisoned CeWTi catalyst via the impregnation method for assessing its performance in NO removal. Experiments show that both K and Na exhibit detrimental effects on the CeWTi catalyst, and the loading of alkali metal reduces the specific surface area and pore volume of the catalyst. Furthermore, the presence of alkaline metals results in a notable decline in the CeWTi acid concentration, particularly in Lewis acid sites. Concurrently, the levels of Ce<sup>3+</sup>, oxygen vacancies, and reducing agents on the catalyst surface decrease, leading to diminished reduction capability and eventual catalyst deactivation. The application of a BP neural network for catalyst activity prediction yielded an average relative error of approximately 0.73%, indicating enhanced accuracy in prediction outcomes. This work explored the cause of alkali metal poisoning of the CeWTi catalyst and provided an effective prediction method for the lifetime of CeWTi catalyst, which provided theoretical guidance for the engineering application of Ce-based catalysts. |
| format | Article |
| id | doaj-art-d3273f81661d4e08a1436fbb6a4b410b |
| institution | Kabale University |
| issn | 1420-3049 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj-art-d3273f81661d4e08a1436fbb6a4b410b2024-12-13T16:28:19ZengMDPI AGMolecules1420-30492024-11-012923557010.3390/molecules29235570Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of CatalystsMutao Xu0Yuhang Deng1Xingxiu Gao2Qijie Jin3Wei Yan4Liguo Chen5Jian Yang6Jing Song7Changcheng Zhou8Haitao Xu9School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaSchool of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaSchool of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaSchool of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaSchool of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaNanjing Gekof Institute of Environmental Protection Technology & Equipment Co., Nanjing 210031, ChinaNanjing Gekof Institute of Environmental Protection Technology & Equipment Co., Nanjing 210031, ChinaSchool of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCe-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because of their good catalytic performance and environmental friendliness. However, the mechanism of alkali metal poisoning in Ce-based catalysts remains to be further studied. This work involves the preparation of the K/Na-poisoned CeWTi catalyst via the impregnation method for assessing its performance in NO removal. Experiments show that both K and Na exhibit detrimental effects on the CeWTi catalyst, and the loading of alkali metal reduces the specific surface area and pore volume of the catalyst. Furthermore, the presence of alkaline metals results in a notable decline in the CeWTi acid concentration, particularly in Lewis acid sites. Concurrently, the levels of Ce<sup>3+</sup>, oxygen vacancies, and reducing agents on the catalyst surface decrease, leading to diminished reduction capability and eventual catalyst deactivation. The application of a BP neural network for catalyst activity prediction yielded an average relative error of approximately 0.73%, indicating enhanced accuracy in prediction outcomes. This work explored the cause of alkali metal poisoning of the CeWTi catalyst and provided an effective prediction method for the lifetime of CeWTi catalyst, which provided theoretical guidance for the engineering application of Ce-based catalysts.https://www.mdpi.com/1420-3049/29/23/5570NH<sub>3</sub>-SCR reactionCe-based catalystsalkaline metal poisoninglifetime prediction |
| spellingShingle | Mutao Xu Yuhang Deng Xingxiu Gao Qijie Jin Wei Yan Liguo Chen Jian Yang Jing Song Changcheng Zhou Haitao Xu Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts Molecules NH<sub>3</sub>-SCR reaction Ce-based catalysts alkaline metal poisoning lifetime prediction |
| title | Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts |
| title_full | Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts |
| title_fullStr | Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts |
| title_full_unstemmed | Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts |
| title_short | Impact of Alkali Metals on CeO<sub>2</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for NH<sub>3</sub>-Selective Catalytic Reduction and Lifetime Prediction of Catalysts |
| title_sort | impact of alkali metals on ceo sub 2 sub wo sub 3 sub tio sub 2 sub catalysts for nh sub 3 sub selective catalytic reduction and lifetime prediction of catalysts |
| topic | NH<sub>3</sub>-SCR reaction Ce-based catalysts alkaline metal poisoning lifetime prediction |
| url | https://www.mdpi.com/1420-3049/29/23/5570 |
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