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 NH 3 -SCR-DeNO x with more than 80% NO conversion and more than 85% N 2 selectivity in the temperature range of 100 – 500 °C. The presence of Cu+ species located in sodalite cages with elevated redox cyclability guarantees high activity and N 2 selectivity up to 400 °C over CuY-Crown. Above 400 °C, a high activity and N 2 selectivity are related to the accessibility of chemisorbed NH 3 to the gaseous NO during the NH 3 -SCR-DeNO x. [Display omitted] • Zeolite Y with a high n (Si)/ n (Al) ratio is obtained using 15-Crown-5. • CuY-Crown outperformed other CuY counterparts in NH 3 -SCR-DeNO x. • Cu+ species located in sodalite cages guarantee high activity and N 2 selectivity. [ABSTRACT FROM AUTHOR]