Molecular motions of adsorbed CO2 on a tetrazole-functionalized PIM polymer studied with 13C NMR

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DOIResolve DOI: http://doi.org/10.1021/jp4084234
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TypeArticle
Journal titleThe Journal of Physical Chemistry C
ISSN1932-7447
1932-7455
Volume117
Issue44
Pages2299522999; # of pages: 5
SubjectCO2; 13C NMR; in situ NMR; adsorption; membrane separation; PIM; tetrazole-functionalized
AbstractThe CO2 adsorption in a polymer of intrinsic microporosity (PIM) functionalized by tetrazole (TZPIM) has been studied with in situ 13C nuclear magnetic resonance (NMR) spectroscopy at variable temperature and loading conditions. The CO2 molecules are seen to interact with tetrazole sites through physisorption. The adsorbed system was studied from 8 K to 385 K at two loadings of CO2. The 13C NMR resonance lineshapes and relaxation times have been analyzed to give insights into the adsorption process. The CO2 molecules undergo site to site hopping with accompanying CO2 reorientations while adsorbed on TZPIM, resulting in line narrowing starting near 100 K. Correspondingly, the spin echo T2 passes through a minimum at 100 K. The analysis indicates two kinds of adsorption sites are available.
Publication date
PublisherAmerican Chemical Society (ACS)
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NRC numberNRC-EME-53243
NPARC number21270311
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Record identifier693dc3ca-eeb3-4db1-88c6-380db6ad16e6
Record created2014-01-23
Record modified2017-03-23
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