The role of alkali metal ions on hydrothermal stability of Cu/SSZ-13 NH3-SCR catalysts
The role of alkali metal ions on hydrothermal stability of Cu/SSZ-13 NH3-SCR catalysts
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碱金属离子对Cu/SSZ-13 NH3-SCR催化剂水热稳定性的影响
DOI:
10.1016/j.cattod.2019.06.074
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发表时间:
2020-09
期刊:
影响因子:
5.3
通讯作者:
Xue Kang
中科院分区:
文献类型:
--
作者:
Chen Wang;Wenjun Yan;Zhixin Wang;Zexiang Chen;Jianqiang Wang;Jun Wang;Jiaming Wang;Meiqing Shen;Xue Kang
Cu/SSZ-13 has considered being a good candidate for NH3-SCR catalysts. However, in real world, Cu/SSZ-13 inevitably expose to alkali metals deposit and hydrothermal aging, and hence, the role of alkali ions (Na+and K+) poisoning on the hydrothermal stability of Cu/SSZ-13 was investigated in this work. The Cu/SSZ-13 catalyst was treated with different loadings of alkali content at 600 °C or different hydrothermal temperatures at low alkali metal loading. Different from non-poisoned Cu/SSZ-13 catalysts under hydrothermal aging, the introduced alkali ions weaken the hydrothermal stability of Cu/SSZ-13 and make poisoned catalysts have inferior SCR performance. H2-TPR results demonstrate the presence of alkali ions lead to more copper ions transform to copper oxides species and the extents of transformation increase as the alkali contents and aging temperature increasing. Moreover, XRD results prove that the CHA framework collapse and, simultaneously, SiO2and CuAlOxspecies form under high contents of alkali ions or high aging temperature. Besides, potassium invariably shows the severe deactivation because of a small hydrated diameter and strong binding ability. Our study reveals that diesel should pay attention to control the contents of alkali ions, especially for K+, in automotive products and the operating temperature in after-treatment applications.
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影响因子:
7.3
作者:
Shen Meiqing;Zhang Yun;Wang Jianqiang;Wang Chen;Wang Jun
通讯作者:
Wang Jun
影响因子:
6.9
作者:
Wang Can;Wang Chen;Wang Jun;Wang Jianqiang;Shen Meiqing;Li Wei
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Li Wei
影响因子:
22.1
作者:
Wang, Di;Jangjou, Yasser;Epling, William S.
通讯作者:
Epling, William S.
影响因子:
12.9
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Gao, Feng;Wang, Yilin;Peden, Charles H. F.
通讯作者:
Peden, Charles H. F.
影响因子:
22.1
作者:
Zhao, Zhenchao;Yu, Rui;Zhang, Weiping
通讯作者:
Zhang, Weiping