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

Sooraj Mohan, P. Dinesha, Shiva Kumar

Research output: Contribution to journalReview article

1 Citation (Scopus)

Abstract

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
DOIs
Publication statusPublished - 01-03-2020

Fingerprint

Zeolites
Thyristors
Ammonia
zeolite
Copper
ammonia
catalyst
copper
Catalysts
Temperature
topology
temperature
nitrate
Nitrates
Topology

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "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.",
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AB - 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.

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