Adsorption of CO on LTA zeolite adsorbents: An IR investigation

Autor:	Guido Busca, Tania Montanari, Isabel Salla
Rok vydání:	2008
Předmět:	Coordination sphere Hydrogen Chemistry Inorganic chemistry chemistry.chemical_element Infrared spectroscopy General Chemistry Condensed Matter Physics Molecular sieve Mordenite Ion Adsorption Mechanics of Materials General Materials Science Zeolite
Zdroj:	Microporous and Mesoporous Materials. 109:216-222
ISSN:	1387-1811
DOI:	10.1016/j.micromeso.2007.04.045
Popis:	The low temperature adsorption of CO on the zeolites K-LTA (3A) Na-LTA (4A) and Ca,Na-LTA (5A) has been investigated by IR spectroscopy. For comparison, the adsorption of CO on K-MOR, Na-MOR and Ca-MOR has also been studied. CO adsorption on K-LTA zeolite is mostly limited at the external surface. In the case of Na-LTA zeolite, terminal Na+ carbonyls are formed. In the case of Ca,Na-LTA zeolite, Ca2+ polycarbonyls and monocarbonyls are observed. In both Na-LTA and Ca,Na-LTA zeolites strongly bonded CO characterized by low CO stretching frequencies (2112 and 2107–2099 cm−1) are also observed. These have been identified as CO interacting with more than one cation, through both the C atom and the O atom. Ca2+ ions in Ca,Na-LTA zeolite are also bonded to extraframework hydroxyl and carbonate ions, which modify their coordination sphere. These results may be relevant in relation to the use of these zeolites as adsorbents for the removal of CO from fuel gases, such as hydrogen.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e93788d93801e87a27b1f2712d109a1 https://doi.org/10.1016/j.micromeso.2007.04.045 Zobrazit plný text záznamu Full Text from ScienceDirect