Cu-SAPO-18 catalysts were prepared by incipient-wetness impregnation method and aqueous solution ion-exchanged method. All the catalysts were studied for the selective catalytic reduction of NO with ammonia as reductant. The isolated Cu2+ ions and highly dispersed copper oxides result in the high performance for NOx abatement, but the excess CuO will inhibit the activity at high temperature. The active sites at low temperature of Cu-SAPO-18 catalysts are most likely the Cu2+ ions, which are located in the pear shaped supercages and deviate from the center of 6-membered ring planes of SAPO-18 zeolite. The in-situ DRIFTS results indicated that the Lewis acid sites supplied major ammonia species for NH3-SCR, meanwhile the significant nitrate/nitrite species were mainly formed through the attachment of nitric oxides to Cu ions. The proposed reaction mechanism illuminated the specific role of Cu ions for NH3-SCR at low temperature.

Different effect of Cu species on highly active Cu-SAPO-18 catalysts for selective catalytic reduction of NO with ammonia

251st National Meeting (2016)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.