Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO2‐Tolerance in NH3‐SCR of NOx

Rare-earth ions: Rare-earth yttrium modified Cu-SSZ-39 zeolite shows significant enhancements on NH3-SCR activity, hydrothermal stability and SO2-tolerance especially under harsh hydrothermal aging at 900 °C. The concept of controlled sitings of the Cu active sites by adding rare-earth ions is highly valuable for design of more stable and active NH3-SCR catalysts in future.