The influence of Si/Al ratio on the catalytic property and hydrothermal stability of Cu-SSZ-13 catalysts for NH^sub 3^-SCR
Cu-SSZ-13 catalysts with three Si/Al ratios of 6, 15 and 30 were synthesized by a one-pot method. The catalytic property and hydrothermal stability of as-prepared catalysts were studied to understand the influence of Si/Al ratio on the NH3-SCR performance over Cu-SSZ-13 catalysts. Although the three...
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Published in | Applied catalysis. A, General Vol. 550; p. 256 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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Amsterdam
Elsevier Science SA
25.01.2018
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Abstract | Cu-SSZ-13 catalysts with three Si/Al ratios of 6, 15 and 30 were synthesized by a one-pot method. The catalytic property and hydrothermal stability of as-prepared catalysts were studied to understand the influence of Si/Al ratio on the NH3-SCR performance over Cu-SSZ-13 catalysts. Although the three catalysts contain equivalent Cu loading, they perform different catalytic activities for NO reduction. The EPR and H2-TPR results clearly show that the Si/Al ratio not only has influence on the nature of Cu species but also on the Cu species distribution. With increasing the Si/Al ratio, the amount of CuO increases while the number of highly stable Cu+ ions decreases. Such a phenomenon could be attributed to the less Al content in high-Si/Al-ratio catalysts. Besides, the acidity is also found to be affected by the Si/Al ratio. The NH3-TPD results demonstrate that the total number of acid sites decreases with increasing the Si/Al ratio. Lacking sufficient acidity is also responsible for the inferior NO reduction activity of Cu-SSZ-13 with Si/Al = 30. Meanwhile, kinetic analysis over fresh catalysts was conducted and the conclusion correlated well with the NH3-SCR performance. Additionally, three catalysts exhibit distinct resistances to hydrothermal treatment. The XRD, N2 physisorption and NH3-SCR performance results consistently indicate the Cu-SSZ-13 with Si/Al = 15 is much more resistant to hydrothermal aging than another two catalysts probably due to its considerably stability of zeolite structure and Cu ions. |
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AbstractList | Cu-SSZ-13 catalysts with three Si/Al ratios of 6, 15 and 30 were synthesized by a one-pot method. The catalytic property and hydrothermal stability of as-prepared catalysts were studied to understand the influence of Si/Al ratio on the NH3-SCR performance over Cu-SSZ-13 catalysts. Although the three catalysts contain equivalent Cu loading, they perform different catalytic activities for NO reduction. The EPR and H2-TPR results clearly show that the Si/Al ratio not only has influence on the nature of Cu species but also on the Cu species distribution. With increasing the Si/Al ratio, the amount of CuO increases while the number of highly stable Cu+ ions decreases. Such a phenomenon could be attributed to the less Al content in high-Si/Al-ratio catalysts. Besides, the acidity is also found to be affected by the Si/Al ratio. The NH3-TPD results demonstrate that the total number of acid sites decreases with increasing the Si/Al ratio. Lacking sufficient acidity is also responsible for the inferior NO reduction activity of Cu-SSZ-13 with Si/Al = 30. Meanwhile, kinetic analysis over fresh catalysts was conducted and the conclusion correlated well with the NH3-SCR performance. Additionally, three catalysts exhibit distinct resistances to hydrothermal treatment. The XRD, N2 physisorption and NH3-SCR performance results consistently indicate the Cu-SSZ-13 with Si/Al = 15 is much more resistant to hydrothermal aging than another two catalysts probably due to its considerably stability of zeolite structure and Cu ions. |
Author | Fan, Chi Pang, Lei Li, Tao Chen, Hanping Chen, Zhen Zhang, Xiaofeng Liu, Peng Albert, Kouadio Brou Ming, Shujun |
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Snippet | Cu-SSZ-13 catalysts with three Si/Al ratios of 6, 15 and 30 were synthesized by a one-pot method. The catalytic property and hydrothermal stability of... |
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SubjectTerms | Acidity Aluminum Ammonia Catalysis Catalysts Chemical synthesis Copper Hydrothermal treatment Kinetics Reduction Structural stability Zeolites |
Title | The influence of Si/Al ratio on the catalytic property and hydrothermal stability of Cu-SSZ-13 catalysts for NH^sub 3^-SCR |
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