Deep insight into CO adsorption on Ni-USY zeolite catalyst by FTIR spectroscopy. Evidence for isotopic isomerism

R. Belykh (1) , F. Maugé (1) , A. Tsyganenko (2)

1 LCS - Laboratoire catalyse et spectrochimie
2 NIF - V.A. Fock Institute of Physics

FTIR spectra of CO adsorbed on reduced Ni-containing USY zeolites with Si/Al=30 besides weak H-bond with bridged hydroxyls and silanol groups and bonding to Ni2+ cations reveal formation of mono-, diand tricarbonyls with Ni+ sites. The bands of adsorbed CO species are very narrow, with FWMH~1—1.5 cm−1. The spectra of isotopically mixed nickel dicarbonyl species reveal the splitting, which shows that two CO molecules occupy non-equivalent positions, so that the species exist in two isomeric forms, despite the similarity of sites, following from the spectra of monocarbonyls. Possible explanations of this phenomenon are discussed.

Domaines: Chimie; Chimie analytique; Catalyse

R. Belykh, F. Maugé, A. Tsyganenko. Deep insight into CO adsorption on Ni-USY zeolite catalyst by FTIR spectroscopy. Evidence for isotopic isomerism. Applied Catalysis A : General, 2019, 583, pp.117140. ⟨10.1016/j.apcata.2019.117140⟩. ⟨hal-02345839⟩