Improved hydrothermal stability of silica materials prepared from ethyl silicate 40

Wang, Shengnan, Wang, David K., Jack, Kevin S., Smart, Simon and da Costa, Joao C. Diniz (2015) Improved hydrothermal stability of silica materials prepared from ethyl silicate 40. RSC Advances, 5 8: 6092-6099. doi:10.1039/c4ra12483a


Author Wang, Shengnan
Wang, David K.
Jack, Kevin S.
Smart, Simon
da Costa, Joao C. Diniz
Title Improved hydrothermal stability of silica materials prepared from ethyl silicate 40
Journal name RSC Advances   Check publisher's open access policy
ISSN 2046-2069
Publication date 2015
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c4ra12483a
Open Access Status Not Open Access
Volume 5
Issue 8
Start page 6092
End page 6099
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2015
Language eng
Formatted abstract
Microporous silica materials with improved hydrothermal stability were synthesized through a sol–gel process using ethyl silicate 40 as the starting silica precursor. The effects of reactants for water (hydrolysing agent), acid (catalyst) and ethanol (solvent) ratios on the microstructure of the silica matrices and their hydrothermal stability under harsh conditions (550 °C, 75 mol% vapour, 20 h) were systematically studied. All the calcined silica matrices were microporous and the degree of microporosity was found to increase with decreasing water and acid ratios, or increasing ethanol ratio. The most hydrothermally stable matrix was obtained by promoting the water and acid ratios whilst decreasing the ethanol ratio. A strong correlation was found between the FTIR area ratio of silanol/siloxane vibrational peaks and the initial micropore volume, and this relationship revealed that the greatest pore volume loss (>70%) occurred in the xerogels possessing a high silanol/siloxane ratio (>0.16) and a high initial micropore volume percentage (>85%). SAXS data also revealed that the most robust, hydrothermally stable silica matrices are closely associated with the formation of a more open silica microstructure derived from thermal consolidation of larger silica particles.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
Centre for Microscopy and Microanalysis Publications
 
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