In situ Fourier transform infrared (FTIR) investigation of CO{sub 2} adsorption onto zeolite materials
- United States Department of Energy, Morgantown, WV (United States). National Energy Technology Laboratory
The adsorption of CO{sub 2} onto five zeolite materials (13X, WEG, AGP, 4A, and 5A) was studied by in situ infrared spectroscopy at 1 atm as a function of the pretreatment temperature (120 and 350{sup o}C) and adsorption temperature (30 and 120{sup o}C). Adsorbed CO{sub 2} surface species identified in the current work include physisorbed CO{sub 2}, bidentate carbonate, bridged bidentate carbonate, monodentate carbonate, and carboxylate. Both pretreatment temperature and CO{sub 2} adsorption temperature affected the type and amount of adsorbed CO{sub 2} species formed. Materials pretreated at 350{sup o}C, as opposed to 120{sup o}C, had more surface adsorption sites available as evidenced from the resulting more intense IR bands. Physisorbed CO{sub 2} was the most abundant species observed. Bridged bidentate carbonate was found to be more stable than bidentate carbonate. Tests involving both CO{sub 2} and H{sub 2}O showed that the two species competed for the same adsorption sites on the zeolite surface. 18 refs., 15 figs., 1 tab.
- OSTI ID:
- 21107439
- Journal Information:
- Energy and Fuels, Vol. 22, Issue 5; Other Information: ranjani.siriwardane@netl.doe.gov; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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