Citation: Lijing Sun, Miao Yang, Yi Cao, Peng Tian, Pengfei Wu, Lei Cao, Shutao Xu, Shu Zeng, Zhongmin Liu. A reconstruction strategy for the synthesis of Cu-SAPO-34 with excellent NH₃-SCR catalytic performance and hydrothermal stability[J]. Chinese Journal of Catalysis, ;2020, 41(9): 1410-1420. doi: 10.1016/S1872-2067(20)63583-5 shu

A reconstruction strategy for the synthesis of Cu-SAPO-34 with excellent NH₃-SCR catalytic performance and hydrothermal stability

Lijing Sun ^a,b, ,
Miao Yang ^a ,
Yi Cao ^a,c ,
Peng Tian ^a ,
Pengfei Wu ^a,b ,
Lei Cao ^a ,
Shutao Xu ^a ,
Shu Zeng ^a,b ,
Zhongmin Liu ^a

a National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 16 January 2020
Revised Date: 27 February 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21476228, 21606221, 21676262, 21991091), and the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-JSC0 40).

A reconstruction strategy has been developed to synthesize Cu-SAPO-34 with a wide crystallization phase region, high solid yield, and tunable Si and Cu contents. Cu-rich SAPO-34 was prepared from a Cu-amine complex, which acted as a precursor and Cu source for the reconstruction synthesis. The role of the Cu-amine complex as a template was restricted, which allowed easier control over the Cu and Si contents than in the previously reported "one-pot" synthesis method. Characterization of the material revealed that the Si(4Al) coordination environment dominates the synthesized Cu-SAPO-34 catalysts. High-temperature hydrothermal treatment increased the isolated Cu²⁺ content slightly, and the acid sites in the low-silica catalyst are more resistant to hydrothermal treatment than those of the existing catalysts. The obtained materials, especially the low-silica Cu-SAPO-34 sample, exhibit excellent catalytic activity and hydrothermal stability for the selective catalytic reduction of NO_x by NH₃ (NH₃-SCR). In addition, the influence of the catalyst acidity on the NH₃-SCR reaction was also investigated and is discussed. The high synthetic efficiency and outstanding catalytic performance make Cu-SAPO-34 synthesized by the reconstruction method a promising catalyst for the NH₃-SCR process.
- Cu-SAPO-34,
- Hydrothermal synthesis,
- NH₃-SCR,
- Hydrothermal stability,
- Crystallization
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A reconstruction strategy for the synthesis of Cu-SAPO-34 with excellent NH3-SCR catalytic performance and hydrothermal stability

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通讯作者: 陈斌, bchen63@163.com

A reconstruction strategy for the synthesis of Cu-SAPO-34 with excellent NH₃-SCR catalytic performance and hydrothermal stability