Počet záznamů: 1  

The nature of cationic adsorption sites in alkaline zeolites-single, dual and multiple cation sites

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    0380813 - ÚOCHB 2013 RIV GB eng J - Článek v odborném periodiku
    Nachtigall, P. - Delgado, M. R. - Nachtigallová, Dana - Arean, C. O.
    The nature of cationic adsorption sites in alkaline zeolites-single, dual and multiple cation sites.
    Physical Chemistry Chemical Physics. Roč. 14, č. 5 (2012), s. 1552-1569. ISSN 1463-9076. E-ISSN 1463-9084
    Grant CEP: GA ČR GA203/09/0143
    Výzkumný záměr: CEZ:AV0Z40550506
    Klíčová slova: exchanged ZSM-5 zeolites * carbon-monoxide adsorption * low-temperature CO * solid-state NMR * high-silica zeolites
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.829, rok: 2012

    Gas adsorption on zeolites constitutes the base of many technological applications of these versatile porous materials. Quite often, especially when dealing with small molecules, individual extra-framework (exchangeable) cations are considered to be the adsorption site on which molecules coming from a gas phase form the corresponding adsorption complex. Nonetheless, while that can be the case in some instances, recent research work that combines variable temperature infrared spectroscopy with periodic DFT calculations showed that some types of adsorption sites involve two or more cations, which constitute dual and multiple cation sites, respectively. Adsorption complexes formed on these cationic adsorption sites differ in both structure and stability from those formed on a single cation alone. Examples concerning CO, CO2 and H-2 adsorption on alkali and alkaline-earth metal exchanged zeolites are reviewed, with the double purpose of clarifying concepts and highlighting their relevance to practical use of zeolites in such fields as gas separation and purification, gas storage and heterogeneous catalysis.
    Trvalý link: http://hdl.handle.net/11104/0211426

     
     
Počet záznamů: 1  

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