Carbon dioxide (C{sup 16}O{sub 2} and C{sup 18}O{sub 2}) adsorption in zeolite Y materials: effect of cation, adsorbed water and particle size
- University of Iowa, Iowa City, IA (United States). Department of Chemistry
In this study, CO{sub 2} adsorption in the presence and absence of co-adsorbed H{sub 2}O was investigated in zeolite Y. Several different zeolite Y materials were investigated including commercial NaY, commercial NaY ion-exchanged with Ba{sup 2+} and nanocrystalline NaY; herein referred to as NaY, BaY and nano-NaY. Following heating of these zeolites to 573 K and cooling to room temperature, CO{sub 2} was adsorbed as a function of pressure. FTIR spectra show that a majority of CO{sub 2} adsorbs in the pores of these three zeolites (NaY, BaY and nano-NaY) in a linear complex with the exchangeable cation, as indicated by the intense absorption band near 2350 cm{sup -1}, assigned to the 3 asymmetric stretch of adsorbed CO{sub 2}. Most interestingly is the formation of carbonate and bicarbonate on the external surface of nano-NaY zeolites as indicated by the presence of several broad absorption bands in the 1200-1800 cm{sup -1} region, suggesting unique sites for CO{sub 2} adsorption on the surface of the nanomaterial. For the other two zeolite materials investigated, bicarbonate formation is only evident in BaY zeolite in the presence of co-adsorbed water. Adsorption of {sup 18}O-labeled carbon dioxide and theoretical quantum chemical calculations confirm these assignments and conclusions. 28 refs., 9 figs., 3 tabs.
- OSTI ID:
- 21176787
- Journal Information:
- Energy and Environmental Science, Vol. 2, Issue 4; ISSN 1754-5692
- Country of Publication:
- United States
- Language:
- English
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