Determination of ion-exchanged Co2+ cation in Co-ZSM-5 by temperature-programmed desorption

Abstract

It is shown that temperature-programmed desorption of adsorbed NO on Co-ZSM-5 zeolite used in selective catalytic reduction can accurately measure the amount of Co²⁺ cation for Co/Al ratios from 0 to 0.42 where the 0.42 limit corresponds to 84% maximum exchange. Evidence is also shown for the formation of cobalt oxide particles in Co-ZSM-5 for Co/Al ratios above 0.42.