期刊
JOURNAL OF CATALYSIS
卷 392, 期 -, 页码 217-230出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.10.005
关键词
NH3-SCR; Core-shell; Ion migration; SSZ-13; Hydrothermal stability
资金
- National Natural Science Foundation of China [51778296]
A core-shell structure Cu-Ce-La/SSZ-13@ZSM-5 catalyst with a Cu-Ce-La/SSZ-13 core and a ZSM-5 shell was first synthesized by a self-assembly method and used for ammonia-selective catalytic reduction (NH3-SCR). In comparison with Cu-Ce-La/SSZ-13, Cu-Ce-La/SSZ-13@ZSM-5 with appropriate shell thickness presents better SCR activity and hydrothermal stability. We discovered an ion migration effect dur ing the shell phase assembly process and further proposed that the ion migration effect was induced by the dissolution of the core phase during the growth of the shell. Part of the metal ions were migrated and redistributed during the assembly of the ZSM-5 shell, resulting in the transformation of [Cu(OH)]+-Z to Cu2+-2Z species and the functionalization of the shell phase. The functionalized shell is beneficial for the adsorption and activation of NH3. The results of an H2O resistance test and thermogravimetric analysis confirm that the coating of the hydrophobic shell can effectively improve the hydrothermal stability and H2O resistance of core-shell Cu-Ce-La/SSZ-13@ZSM-5. (C) 2020 Elsevier Inc. All rights reserved.
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