Disclosing the enhanced NH3-SCR-DeNOx activity of Cu-containing zeolite Y prepared with 15-Crown-5

The phase-pure zeolite Y with a high n(Si)/n(Al) ratio is obtained with the cyclic polyether 15-Crown-5 as a structure-directing agent. In copper-exchanged for this new zeolite outperformed other Cu-containing zeolite Y counterparts during NH3-SCR-DeNOx with more than 80% NO conversion and more than 85% N2 selectivity in the temperature range of 100 - 500 degrees C. The presence of Cu+ species located in sodalite cages with elevated redox cyclability guarantees high activity and N2 selectivity up to 400 degrees C over CuY-Crown. Above 400 degrees C, a high activity and N2 selectivity are related to the accessibility of chemisorbed NH3 to the gaseous NO during the NH3SCR-DeNOx.