Fe/SSZ-13 as an NH3-SCR catalyst: A reaction kinetics and FTIR/Mössbauer spectroscopic study

- Fe/SSZ-13 catalysts highly active in NH3-SCR synthesized from solution ion exchange.
- Chabazite structure maintains during severe hydrothermal aging.
- Fe stays as hydrated charge-balancing cations in fresh ambient sample.
- Dehydrated Fe ions are highly active in oxidation reactions.
- Upon aging, Fe cations convert to FeOx clusters and FeAlOx species much less active in SCR.