Abstract
In this study Ti-MCM-41 materials have been synthesised and characterised with a view to developing Ti anchoring sites for supporting metal nanoparticles. Up to 20%Ti has been incorporated into the matrix using titanium iso-propoxide. A soft-templating approach has been followed, and the reaction is carried out under highly alkaline conditions. The N 2-sorption and XRD results indicate that a hexagonal mesoporous material is present. However, electron microscopy characterisations indicate that phase and morphological heterogeneities exist. At the atomic scale two phases of oxide particles are formed: a hexagonal mesoporous silicate phase and an amorphous porous titanosilicate phase. At the bulk scale these particles gather into aggregates (>100 μm) which are segregated into Ti-rich and Si-rich entities. Thus, the heterogeneity occurs at both atomic and bulk scales. Although clearly revealed by electron microscopy, these heterogeneities are impervious to detection by the traditional N 2-sorption and low-angle XRD approaches.
Original language | English (US) |
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Pages (from-to) | 466-473 |
Number of pages | 8 |
Journal | Microporous and Mesoporous Materials |
Volume | 151 |
DOIs | |
State | Published - Mar 15 2012 |
Externally published | Yes |
Keywords
- Catalyst substrate
- Compositional mapping
- Electron microscopy
- Precursor delivery sequence
- Titanosilicate
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials