NOx reduction behaviour in copper zeolite catalysts for ammonia SCR systems: A review

Sooraj Mohan, P. Dinesha, Shiva Kumar

Research output: Contribution to journalReview articlepeer-review

167 Citations (Scopus)


This paper reviews the current copper substituted zeolite catalysts, their operating temperature ranges with NOx reduction efficiencies and their deactivation mechanisms. Different zeolite candidates suitable for NH3-SCR are large and medium pore zeolites like ZSM-5, MOR, FER, BEA and small pore zeolites like SSZ-13 and SAPO-34, both having CHA topology. Cu substituted small pore zeolites have demonstrated low temperature NOx reduction with stability at higher temperatures. Cu/SSZ-13 and Cu/SAPO-34 are by far the best catalysts suitable for a broader temperature window and also operate well below 350 °C with good hydrothermal stability. Optimum values of Si/Al ratio (SAR) play a crucial role and hence more studies on variation in SAR and adsorbed monodentate nitrates are required to get a fundamental understanding on their impact on low temperature SCR activity of CHA based catalysts.

Original languageEnglish
Article number123253
JournalChemical Engineering Journal
Publication statusPublished - 01-03-2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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