Controlled synthesis of Cu-based SAPO-18/34 intergrowth zeolites for selective catalytic reduction of NOx by ammonia

Shoute Zhang, Shujun Ming, Lei Guo, Ce Bian, Ying Meng, Qian Liu, Yahao Dong, Jiajun Bi, Dan Li, Qin Wu, Kaiwei Qin, Zhen Chen, Lei Pang, Weiquan Cai, Tao Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Cu-based SAPO-18, SAPO-18/34 intergrowth and SAPO-34 zeolites were applied for the selective catalytic reduction of NOx by ammonia (NH3-SCR) catalysts. Comprehensive characterization results revealed that the SAPO-18/34 with higher amount and strength of acid sites could facilitate the generation of more isolated copper ions (Cu2+ and Cu+) and suppress the formation of CuOx, which might account for the fact that intergrowth crystal structure of Cu-SAPO-18/34 exhibited higher fresh NH3-SCR activity, more robust hydrothermal durability and better SO2-resistance ability than that Cu-SAPO-18 and Cu-SAPO-34. In situ DRIFTS results provided the formation of reaction intermediates, such as -NH2, NH4+, NO3-, NO2-, etc. Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) reaction mechanisms were both involved in Cu-based SAPO-18 and SAPO-18/34 intergrowth zeolites, but the L-H mechanism dominated the NH3-SCR reaction, in addition, Cu-SAPO-34 only followed “L-H” mechanism.

Original languageEnglish
Article number125543
JournalJournal of Hazardous Materials
Volume414
DOIs
Publication statusPublished - 15 Jul 2021
Externally publishedYes

Keywords

  • In-situ DRIFTS
  • NH-SCR
  • SAPO-18/34 intergrowth

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