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

Carbon dioxide was shown to identify surface basic properties of nitrogen-substituted microporous and mesoporous silicas, in addition to conventional basic oxides, by a detailed study using isotherm and heat of adsorption measurements as well as by infrared spectroscopy. A hydrogen-bonded weak inter...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 34(2018), 4 vom: 30. Jan., Seite 1376-1385
1. Verfasser: Ogura, Masaru (VerfasserIn)
Weitere Verfasser: Fukuzawa, Shin-Ya, Fukunaga, Seiichiro, Yamazaki, Hiroshi, Kondo, Junko N, Morimoto, Masafumi, Guillet-Nicolas, Remy, Thommes, Matthias
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't
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520 |a Carbon dioxide was shown to identify surface basic properties of nitrogen-substituted microporous and mesoporous silicas, in addition to conventional basic oxides, by a detailed study using isotherm and heat of adsorption measurements as well as by infrared spectroscopy. A hydrogen-bonded weak interaction was primarily observed 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 amount 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 molecule for identifying weakly interactive hydrogen-bonding sites, and it has potential as a surface probe for strongly interactive nucleophilic sites derived from alkaline ions or a methylated silamino group, Si-N(CH3)-Si 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
700 1 |a Fukuzawa, Shin-Ya  |e verfasserin  |4 aut 
700 1 |a Fukunaga, Seiichiro  |e verfasserin  |4 aut 
700 1 |a Yamazaki, Hiroshi  |e verfasserin  |4 aut 
700 1 |a Kondo, Junko N  |e verfasserin  |4 aut 
700 1 |a Morimoto, Masafumi  |e verfasserin  |4 aut 
700 1 |a Guillet-Nicolas, Remy  |e verfasserin  |4 aut 
700 1 |a Thommes, Matthias  |e verfasserin  |4 aut 
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