SCR of NO by NH_3 on alumina or titania-pillared montmorillonite various modified with Cu or Co Part I.General characterization and catalysts screening

摘要

Al_2O_3-and TiO_2-pillared montmorillonites modified with Cu or Co were studied as catalysts of NO reduction with ammonia.Transition metals were introduced to pillared clays (PILCs) by ion exchange method or simultaneously with pillaring agent to the parent montmorillonite.The obtained materials were characterized using:XRF (composition),XRD(structure),BET and Horvath and Kawazoe (H-K) (texture) and NH_3-TPD (acid centres).The clays intercalated with titania are significantly more active than alumina pillared ones.TiO_2-intercalated montmorillonites modified with Cu have been found to be the most active catalysts in SCR of NO with ammonia in the low temperature region (250-450 deg C), while Co-containing clays are much better at high temperatures (T>400 deg C).