FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites

Abstract

In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn2+, Co2 Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120–2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.

U ovom radu ispitivana je adsorpcija ugljen-monoksida na izmenjenim zeolitima (Mn2+, Co2+, Ni2+) tipa X, Y i mordenita primenom infracrvene spektroskopije sa Furijeovom analizom (FTIR). Adsorpcijom CO na sobnoj temperaturi nastaju složene trake u spektralnoj oblasti od 2120 do 2200 cm-1.Uočeno je da frekvencija trake na oko 2200 cm-1 zavisi i od katjona prisutnog u strukturi, i od sastava same zeolitske rešetke. Uočeno je takođe da frekvencije traka na oko 1600 cm-1 zavise od strukture, odnosno od Si/Al odnosa ispitivanih zeolita.