Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (11): 1715-1722.DOI: 10.1016/S1872-2067(20)63609-9

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Cu-SAPO-17: A novel catalyst for selective catalytic reduction of NOx

Xiaona Liua,b, Yi Caoa,c, Nana Yana,b, Chao Maa,b,d, Lei Caoa, Peng Guoa, Peng Tiana, Zhongmin Liua   

  1. a National Engineering Laboratory for Methanol to Olefins, State Energy Low Carbon Catalysis and Engineering R&D Center, Dalian National Laboratory for Clean Energy, 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;
    d Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2020-02-21 Revised:2020-03-29 Online:2020-11-18 Published:2020-08-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21972136, 21676262, 21606221, 21991091) and the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-JSC040).

Abstract: The high-temperature (HT) and low-temperature (LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia (NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine (CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host-guest interaction and the Brönsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Brönsted acid site after the calcination.

Key words: SAPO-17 molecular sieve, Rietveld refinement, Host-guest interaction, Selective catalytic reduction by ammonia (NH3-SCR), Hydrothermal stability, Location of Cu2+