Iron‐Containing SSZ‐39 (AEI) Zeolite: An Active and Stable High‐Temperature NH₃‐SCR Catalyst

The preparation of the iron‐containing SSZ‐39 zeolite is described for the first time through two different synthesis methods: post‐synthetic cation exchange and one‐pot synthesis. The nature and stability of the iron species within the different Fe‐SSZ‐39 materials have been studied through different characterization techniques, and their catalytic activity has been evaluated for the selective catalytic reduction (SCR) of NO x with ammonia. The directly synthetized Fe‐SSZ‐39 performs better for the SCR of NO x with ammonia than other related Fe‐zeolites, particularly at elevated reaction temperatures (above 450 °C), and presents improved hydrothermal stability when aged under severe conditions.