Efficient synthesis of the Cu-SAPO-44 zeolite with excellent activity for selective catalytic reduction of NOx by NH3

Ying Xin* (Corresponding Author), Nana Zhang, Xiao Wang, Qian Li, Xicheng Ma, Yongxin Qi, Lirong Zheng, James A. Anderson, Zhaoliang Zhang (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A small-pore Cu-chabazite zeolite, Cu-SAPO-44 was synthesized using a one-pot approach by combination of cyclohexylamine template and copper-amine complex. The Cu-SAPO-44 zeolite obtained exhibits excellent activity over a wide temperature window from 200 to 500 °C for the selective catalytic reduction of NOx with ammonia (NH3-SCR). The copper-amine complex allowed direct introduction as well as a high dispersion of extra-framework Cu species in the chabazite structure. In situ X-ray absorption fine structure (XAFS) confirmed the isolated Cu2+ ions and Cu2+ ↔ Cu+ cycle. Temperature-programmed reduction with H2 (H2-TPR) and in situ FTIR of CO adsorption demonstrated that a variety of isolated Cu2+ ions inside the large cages and in or near the six-membered rings of the chabazite structure are responsible for the wide temperature window of activity. Cu-SAPO-44 has shown to be a promising candidate as a SCR catalyst with great potential in after-treatment systems for either mobile or stationary sources.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalCatalysis Today
Volume332
Early online date23 Aug 2018
DOIs
Publication statusPublished - 15 Jul 2019

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Keywords

  • Copper-amine complex
  • Cu-SAPO-44
  • Isolated Cuion
  • Nitrogen oxides
  • Selective catalytic reduction
  • X-ray adsorption fine structure
  • CU/SAPO-34
  • ALUMINOPHOSPHATE STRUCTURES
  • PERFORMANCE
  • NH3-SCR
  • Isolated Cu2+ ion
  • COPPER
  • MOLECULAR-SIEVES
  • SAPO-44
  • CHA
  • IN-SITU XAFS
  • ACIDITY

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis

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