| Enhancement of potassium resistance of Ce-Ti oxide catalyst for NH3-SCR reaction by modification with holmium |
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| 作者姓名： | Chaopeng Duan Ruitang Guo Yuanzhen Liu Guilin Wu Yufang Miao Jingwen Gu Weiguo Pan |
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| 作者单位： | School of Energy Source and Mechanical Engineering;Shanghai Engineering Research Center of Power Generation Environment Protection |
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| 基金项目： | Project supported by the National Key R&D Program of China(2018YFB0605002)。 |
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| 摘 要： | Alkali metal K in exhaust gas has a deactivation effect on NH3-SCR catalysts.In this work,it is discovered that the addition of Ho on CeTi catalyst can remarkably strengthen its K tolerance.The conclusions of Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),NH3 temperature programmed desorption(NH3-TPD)and H2temperature programmed reduction(H2-TPR)analyses demonstrate that the enhancement of K resistance mainly originates from its stronger surface acidity and redox capability,the higher concentration of Ce3+species and surface chemisorbed oxygen.In situ DRIFT analysis reveals that the introduction of Ho on CeTi can remarkably improve the adsorption of NH3 and NOx species on catalyst surface,accompanied by the intensified reactivity of ad-NH3 species,which should also administer to improve the K resistance.
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| 关 键 词： | NH3-SCR Ho Ce Ti oxide catalyst K resistance Rare earths |
| 收稿时间： | 15 July 2020 |
Enhancement of potassium resistance of Ce–Ti oxide catalyst for NH3-SCR reaction by modification with holmium |
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| Chaopeng Duan,Ruitang Guo,Yuanzhen Liu,Guilin Wu,Yufang Miao,Jingwen Gu,Weiguo Pan.Enhancement of potassium resistance of Ce-Ti oxide catalyst for NH3-SCR reaction by modification with holmium[J].Journal of Rare Earths,2022,40(1):49-56. |
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| Affiliation: | 1. School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;2. Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai 200090, China |
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| Abstract: | Alkali metal K in exhaust gas has a deactivation effect on NH3-SCR catalysts. In this work, it is discovered that the addition of Ho on CeTi catalyst can remarkably strengthen its K tolerance. The conclusions of Brunauer–Emmett–Teller (BET) , X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH3 temperature programmed desorption (NH3-TPD) and H2 temperature programmed reduction (H2-TPR) analyses demonstrate that the enhancement of K resistance mainly originates from its stronger surface acidity and redox capability, the higher concentration of Ce3+ species and surface chemisorbed oxygen. In situ DRIFT analysis reveals that the introduction of Ho on CeTi can remarkably improve the adsorption of NH3 and NOx species on catalyst surface, accompanied by the intensified reactivity of ad-NH3 species, which should also administer to improve the K resistance. |
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| Keywords: | Ho Ce–Ti oxide catalyst K resistance Rare earths |
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