Carbon monoxide adsorption at 77 K on zeolites NaX, NaY, NaZSM-5 and HZSM-5 was studied by Fourier transform IR spectrometry. All samples showed strong absorption in the 2160-2180 cm-1 range, which is ascribed to the stretching mode of the C-O bond in carbon monoxide molecules, polarized by Na+ or H+ ions inside the zeolite supercage (faujasites) or channels (ZSM-5). Further, a complex band was observed at 2138 cm-1 and was assigned to liquid-like carbon monoxide. A computer band-fitting method was applied to analyse these bands. Some other minor IR absorptions were also observed and assigned to different adsorbed species.
Infrared Study of Carbon-Monoxide Adsorption at 77-K on Faujasites and ZSM-5 Zeolites
BORDIGA, Silvia;SCARANO, Domenica;SPOTO, Giuseppe;ZECCHINA, Adriano;LAMBERTI, Carlo;
1993-01-01
Abstract
Carbon monoxide adsorption at 77 K on zeolites NaX, NaY, NaZSM-5 and HZSM-5 was studied by Fourier transform IR spectrometry. All samples showed strong absorption in the 2160-2180 cm-1 range, which is ascribed to the stretching mode of the C-O bond in carbon monoxide molecules, polarized by Na+ or H+ ions inside the zeolite supercage (faujasites) or channels (ZSM-5). Further, a complex band was observed at 2138 cm-1 and was assigned to liquid-like carbon monoxide. A computer band-fitting method was applied to analyse these bands. Some other minor IR absorptions were also observed and assigned to different adsorbed species.
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