Phase and morphological segregation in Ti-MCM-41

Vidura Jayaratne, Lan-Yun Chang, Xi-Ya Fang, Alan Chaffee

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6 Citations (Scopus)

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 N2-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 I?m) 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 N2-sorption and low-angle XRD approaches.
Original languageEnglish
Pages (from-to)466 - 473
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume151
DOIs
Publication statusPublished - 2012

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