Energetics of mesoporous silica: Investigation into pore size and symmetry

Olga Trofymluk; Andrey A. Levchenko; Sarah H. Tolbert; Alexandra Navrotsky

doi:10.1021/cm050366g

Energetics of mesoporous silica: Investigation into pore size and symmetry

Olga Trofymluk, Andrey A. Levchenko, Sarah H. Tolbert, Alexandra Navrotsky

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

Two families of calcined highly ordered mesoporous silicas, designed as M41S (MCM-41 and MCM-48) and SBA-n (SB A-15 and SB A-16), are investigated in a wide range of pore sizes from 2.1 to 26.4 nm by high-temperature oxide melt solution calorimetry using lead borate solvent at 974 K. These data are consistent with and extend our earlier studies of zeolite microporous and of mesoporous silicas. The formation enthalpies observed are 19.0-31.4 kJ/mol less exothermic than that of quartz and correlate linearly with pore size for a given structure type. Small- and wide-angle X-ray scattering, nitrogen adsorption (BET), thermogravimetric analysis, and ²⁹Si NMR are employed to give insight into structure and symmetry. The enthalpy differences among samples are discussed in terms of symmetry and structural (point and ring) defects in the materials.

Original language	English (US)
Pages (from-to)	3772-3783
Number of pages	12
Journal	Chemistry of Materials
Volume	17
Issue number	14
DOIs	https://doi.org/10.1021/cm050366g
State	Published - Jul 12 2005
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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abstract = "Two families of calcined highly ordered mesoporous silicas, designed as M41S (MCM-41 and MCM-48) and SBA-n (SB A-15 and SB A-16), are investigated in a wide range of pore sizes from 2.1 to 26.4 nm by high-temperature oxide melt solution calorimetry using lead borate solvent at 974 K. These data are consistent with and extend our earlier studies of zeolite microporous and of mesoporous silicas. The formation enthalpies observed are 19.0-31.4 kJ/mol less exothermic than that of quartz and correlate linearly with pore size for a given structure type. Small- and wide-angle X-ray scattering, nitrogen adsorption (BET), thermogravimetric analysis, and 29Si NMR are employed to give insight into structure and symmetry. The enthalpy differences among samples are discussed in terms of symmetry and structural (point and ring) defects in the materials.",

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AU - Trofymluk, Olga

AU - Levchenko, Andrey A.

AU - Tolbert, Sarah H.

AU - Navrotsky, Alexandra

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N2 - Two families of calcined highly ordered mesoporous silicas, designed as M41S (MCM-41 and MCM-48) and SBA-n (SB A-15 and SB A-16), are investigated in a wide range of pore sizes from 2.1 to 26.4 nm by high-temperature oxide melt solution calorimetry using lead borate solvent at 974 K. These data are consistent with and extend our earlier studies of zeolite microporous and of mesoporous silicas. The formation enthalpies observed are 19.0-31.4 kJ/mol less exothermic than that of quartz and correlate linearly with pore size for a given structure type. Small- and wide-angle X-ray scattering, nitrogen adsorption (BET), thermogravimetric analysis, and 29Si NMR are employed to give insight into structure and symmetry. The enthalpy differences among samples are discussed in terms of symmetry and structural (point and ring) defects in the materials.

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