SITING AND REACTIVITY OF THE CO IONS IN FERRIERITE IN SELECTIVE CATALYTIC REDUCTION OF NO WITH CH4

Catalytic activity of Co ions in CoNaK- and CoH-fenrierites in selecti ve catalytic reduction of NO with methane depending on Co loading was investigated. The previously determined distribution of the exchanged Co ions in Co-ferrierites at three different cationic sites, differrin g in coordination of the Co ions to framework oxygens, has been utiliz ed to analyze catalytic activity of the Co ions. The type of coordinat ion of the Co ions dramatically affects their reactivity in the select ive catalytic reduction of NO with methane. The Co ions coordinated to four framework oxygens of the wall of the main channel exhibit the hi ghest activity, while the Co ions placed in a ''boat shape'', the most packed site of ferrierite show the lowest activity.