Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst
Nitrogen oxides (NO_x) from diesel exhaust can induce severe air pollution problems. Selective catalytic reduction of NO_x with NH_3( NH_3-SCR) is the dominant technology for NO_x abatement from diesel vehicles, and Cu-SSZ-13, with excellent NH_3 -SCR activity and hydrothermal stability, has been wi...
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Editorial Office of Energy Environmental Protection
2023-12-01
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| Series: | 能源环境保护 |
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| Online Access: | https://eep1987.com/en/article/4669 |
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| author | XUE Sen DING Wenqing HAN Xuewang CAO Hehe ZHANG Yan YU Yunbo SHAN Yulong SHAN Wenpo* |
| author_facet | XUE Sen DING Wenqing HAN Xuewang CAO Hehe ZHANG Yan YU Yunbo SHAN Yulong SHAN Wenpo* |
| author_sort | XUE Sen |
| collection | DOAJ |
| description | Nitrogen oxides (NO_x) from diesel exhaust can induce severe air pollution problems. Selective catalytic reduction of NO_x with NH_3( NH_3-SCR) is the dominant technology for NO_x abatement from diesel vehicles, and Cu-SSZ-13, with excellent NH_3 -SCR activity and hydrothermal stability, has been widely used as the NH_3 -SCR catalyst on diesel vehicles of China VI. In the aftertreatment system of diesel vehicles, Cu-SSZ-13 catalyst can be poisoned by the migration of noble metals from oxidation catalysts, and its NH_3-SCR performance will be affected. In this study, the effects of noble metals with different types and concentrations on the performances of Cu-SSZ-13 catalyst were investigated, and the regeneration effects of hydrothermal aging on noble metal poisoning were also analyzed. When the loading amount of noble metal reached a certain level, the performance of Cu-SSZ-13 was significantly affected, especially the high temperature activity. Hydrothermal aging could restore the NO_x conversion of poisoned catalyst to a certain extent, but the formation of N_2O as a byproduct was promoted. Noble metals of Pt and Pd had similar effects on Cu-SSZ-13. The results of XRD (X-ray diffraction) and N_2 physical adsorption showed that the noble metals had no obvious influence on thestructure of Cu-SSZ-13, but they could slightly reduce the specific surface area and pore volume ofthe catalyst. According to the results of separate NH_3 oxidation and NO oxidation, noble metal poisoning could promote the occurrence of side reactions and induce over consumption of NH_3, thus decreasing the NO_x conversion over Cu-SSZ-13 due to lack of reducing agent. This study is helpful to understand the poisoning effects and mechanism of noble metals on commercial Cu-SSZ-13 catalyst for NH_3-SCR. |
| format | Article |
| id | doaj-art-5af5c4ae60c749a7b15237f7c5592f1d |
| institution | Kabale University |
| issn | 2097-4183 |
| language | zho |
| publishDate | 2023-12-01 |
| publisher | Editorial Office of Energy Environmental Protection |
| record_format | Article |
| series | 能源环境保护 |
| spelling | doaj-art-5af5c4ae60c749a7b15237f7c5592f1d2024-12-13T08:30:43ZzhoEditorial Office of Energy Environmental Protection能源环境保护2097-41832023-12-01376364210.20078/j.eep.20230402Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalystXUE Sen0DING Wenqing1HAN Xuewang2CAO Hehe3ZHANG Yan4YU Yunbo5SHAN Yulong6SHAN Wenpo*7Weichai Power Co., Ltd.1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco Environmental Sciences, Chinese Academy of Sciences; 2. Ganjiang Innovation Academy, Chinese Academy of Sciences; 3. School of Chemistry and Chemical Engineering, Nanchang UniversityWeichai Power Co., Ltd.1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco Environmental Sciences, Chinese Academy of Sciences; 2. Ganjiang Innovation Academy, Chinese Academy of SciencesCenter for Excellence in Regional Atmospheric Environment Institute of Urban Environment, Chinese Academy of Sciences1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco Environmental Sciences, Chinese Academy of Sciences; 2. Ganjiang Innovation Academy, Chinese Academy of SciencesState Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco Environmental Sciences, Chinese Academy of Sciences1. Ganjiang Innovation Academy, Chinese Academy of Sciences; 2. Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment, Chinese Academy of SciencesNitrogen oxides (NO_x) from diesel exhaust can induce severe air pollution problems. Selective catalytic reduction of NO_x with NH_3( NH_3-SCR) is the dominant technology for NO_x abatement from diesel vehicles, and Cu-SSZ-13, with excellent NH_3 -SCR activity and hydrothermal stability, has been widely used as the NH_3 -SCR catalyst on diesel vehicles of China VI. In the aftertreatment system of diesel vehicles, Cu-SSZ-13 catalyst can be poisoned by the migration of noble metals from oxidation catalysts, and its NH_3-SCR performance will be affected. In this study, the effects of noble metals with different types and concentrations on the performances of Cu-SSZ-13 catalyst were investigated, and the regeneration effects of hydrothermal aging on noble metal poisoning were also analyzed. When the loading amount of noble metal reached a certain level, the performance of Cu-SSZ-13 was significantly affected, especially the high temperature activity. Hydrothermal aging could restore the NO_x conversion of poisoned catalyst to a certain extent, but the formation of N_2O as a byproduct was promoted. Noble metals of Pt and Pd had similar effects on Cu-SSZ-13. The results of XRD (X-ray diffraction) and N_2 physical adsorption showed that the noble metals had no obvious influence on thestructure of Cu-SSZ-13, but they could slightly reduce the specific surface area and pore volume ofthe catalyst. According to the results of separate NH_3 oxidation and NO oxidation, noble metal poisoning could promote the occurrence of side reactions and induce over consumption of NH_3, thus decreasing the NO_x conversion over Cu-SSZ-13 due to lack of reducing agent. This study is helpful to understand the poisoning effects and mechanism of noble metals on commercial Cu-SSZ-13 catalyst for NH_3-SCR.https://eep1987.com/en/article/4669ptpdcu-ssz-13nh3-scrnoble metal poisoninghydrothermal aging |
| spellingShingle | XUE Sen DING Wenqing HAN Xuewang CAO Hehe ZHANG Yan YU Yunbo SHAN Yulong SHAN Wenpo* Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst 能源环境保护 pt pd cu-ssz-13 nh3-scr noble metal poisoning hydrothermal aging |
| title | Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst |
| title_full | Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst |
| title_fullStr | Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst |
| title_full_unstemmed | Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst |
| title_short | Effects of noble metal poisoning on NH_3-SCR performances of Cu-SSZ-13 catalyst |
| title_sort | effects of noble metal poisoning on nh 3 scr performances of cu ssz 13 catalyst |
| topic | pt pd cu-ssz-13 nh3-scr noble metal poisoning hydrothermal aging |
| url | https://eep1987.com/en/article/4669 |
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