Ogura M, Fukuzawa SY, Fukunaga S, Yamazaki H, Kondo JN, Morimoto M, Guillet-Nicolas R, Thommes M (2018)
Publication Type: Journal article, Original article
Subtype: other
Publication year: 2018
Publisher: American Chemical Society
Book Volume: 34
Pages Range: 1376-1385
Journal Issue: 4
DOI: 10.1021/acs.langmuir.7b03769
Carbon dioxide was shown to identify surface basic properties of nitrogen-substituted microporous and mesoporous silicas, in addn. to conventional basic oxides, by a detailed study using isotherm and heat of adsorption measurements as well as by IR spectroscopy. A hydrogen-bonded weak interaction was primarily obsd. between CO2 and silanol (Si-OH) and silamine (Si-NH-Si) groups. The heat of adsorption of CO2 demonstrated that the latter adspecies were formed preferentially over the former, although a much higher amt. of linear CO2 adspecies were found on SBA-15 mesoporous silica because of the presence of a large quantity of silanol groups on its surface. Carbamate-type chemisorbed adspecies were not detected on silamino sites, whereas carbonate-type adspecies were formed on alkali ion-exchanged zeolites and also residual sodium ions on the surface of silicalite-1. CO2 was shown to be a successful probe mol. for identifying weakly interactive hydrogen-bonding sites, and it has potential as a surface probe for strongly interactive nucleophilic sites derived from alk. ions or a methylated silamino group, Si-N(CH3)-Si. [on SciFinder(R)]
APA:
Ogura, M., Fukuzawa, S.-Y., Fukunaga, S., Yamazaki, H., Kondo, J.N., Morimoto, M.,... Thommes, M. (2018). Identification of the Basic Sites on Nitrogen-Substituted Microporous and Mesoporous Silicate Frameworks Using CO2 as a Probe Molecule. Langmuir, 34(4), 1376-1385. https://doi.org/10.1021/acs.langmuir.7b03769
MLA:
Ogura, Masaru, et al. "Identification of the Basic Sites on Nitrogen-Substituted Microporous and Mesoporous Silicate Frameworks Using CO2 as a Probe Molecule." Langmuir 34.4 (2018): 1376-1385.
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