热液循环
化学
催化作用
壳体(结构)
热重分析
选择性催化还原
相(物质)
吸附
表面改性
化学工程
水热合成
无机化学
溶解
ZSM-5型
沸石
材料科学
物理化学
有机化学
复合材料
工程类
作者
Zhiqiang Chen,Li Liu,Hongxia Qu,Baojing Zhou,Huifang Xie,Qin Zhong
标识
DOI:10.1016/j.jcat.2020.10.005
摘要
A core–shell structure Cu–Ce–La/[email protected] 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/[email protected] with appropriate shell thickness presents better SCR activity and hydrothermal stability. We discovered an ion migration effect during 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/[email protected]
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