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Mesoporous silica synthesis in sub- and supercritical carbon dioxide

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dc.contributor.authorChun, B.
dc.contributor.authorPendleton, P.
dc.contributor.authorBadalyan, A.
dc.contributor.authorPark, S.
dc.contributor.organisationInstitute for Mineral and Energy Resources
dc.date.issued2010
dc.description.abstractMesoporous silicas were synthesized from sodium silicate (Na₂Si₃O₇) and tetraethylorthosilicate (TEOS) with Pluronic F127 (polyethylene oxide-polypropylene oxide-polyethylene oxide, EO₁₀₆PO₇₀EO₁₀₆) triblock copolymer using sub- and supercritical carbon dioxide (SubCO₂ and SCO₂) respectively, as solvents. Templates were removed using liquid carbon dioxide (LCO₂) and SCO₂. The most efficient template removal was achieved by LCO₂ − 92.7% (w/w), followed by LCO₂ with ethanol entrainer − 85.6% (w/w), and by methanol − 78.8% (w/w). The best efficiency of template removal by SCO₂ was 50.7%. Values of specific surface areas, ABET, were increased by 10% with the increase of an ageing time from 6 to 24 hours for Na₂Si₃O₇-based silicas at aqueous synthesis conditions, whereas the use of SCO₂ reduced this value by 19.4%. For TEOS-based silicas synthesized using SCO₂, A BET values increased by 3.8 times. Application of SCO₂ for synthesis of TEOS-based silicas resulted in higher mesopore volumes of 0.719 and 1.241 mL/g with an average mesopore width varying from 3.4 to 3.9 nm. Although Na₂Si₃O₇-based silicas have almost similar mesopore width range, their mesopore volumes were 7 times less than those for TEOS-based silicas. Formation of mesopores in Na₂Si₃O₇- and TEOS-based silicas was at the expense of micropores when synthesized in SCO₂.
dc.description.statementofresponsibilityByung-Soo Chun, Phillip Pendleton, Alexander Badalyan, and Sun-Young Park
dc.identifier.citationKorean Journal of Chemical Engineering, 2010; 27(3):983-990
dc.identifier.doi10.1007/s11814-010-0130-x
dc.identifier.issn0256-1115
dc.identifier.issn1975-7220
dc.identifier.orcidPendleton, P. [0000-0003-1031-8170]
dc.identifier.orcidBadalyan, A. [0000-0003-1130-6083]
dc.identifier.urihttp://hdl.handle.net/2440/75357
dc.language.isoen
dc.publisherKorean Inst Chem Engineers
dc.rightsCopyright staus unknown
dc.source.urihttps://doi.org/10.1007/s11814-010-0130-x
dc.subjectMesoporous Silica Synthesis
dc.subjectMesopore Development
dc.subjectPluronic F127 Triblock Copolymer
dc.subjectLiquid Carbon Dioxide Solvent
dc.subjectSupercritical Carbon Dioxide Solvent
dc.titleMesoporous silica synthesis in sub- and supercritical carbon dioxide
dc.typeJournal article
pubs.publication-statusPublished

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