Identification of the Basic Sites on Nitrogen-Substituted Microporous and Mesoporous Silicate Frameworks Using CO2 as a Probe Molecule.

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

Journal

Langmuir American Chemical Society

Publisher: American Chemical Society

Book Volume: 34

Pages Range: 1376-1385

Journal Issue: 4

DOI: 10.1021/acs.langmuir.7b03769

Abstract

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)]

Authors with CRIS profile

Matthias Thommes Lehrstuhl für Thermische Verfahrenstechnik

Involved external institutions

Tokyo Institute of Technology JP Japan (JP) University of Tokyo JP Japan (JP) Quantachrome Instruments US United States (USA) (US)

How to cite

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://dx.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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