Phase and morphological segregation in Ti-MCM-41

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

Research output: Contribution to journalArticleResearchpeer-review

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

Cite this

Jayaratne, Vidura ; Chang, Lan-Yun ; Fang, Xi-Ya ; Chaffee, Alan. / Phase and morphological segregation in Ti-MCM-41. In: Microporous and Mesoporous Materials. 2012 ; Vol. 151. pp. 466 - 473.
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author = "Vidura Jayaratne and Lan-Yun Chang and Xi-Ya Fang and Alan Chaffee",
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Phase and morphological segregation in Ti-MCM-41. / Jayaratne, Vidura; Chang, Lan-Yun; Fang, Xi-Ya; Chaffee, Alan.

In: Microporous and Mesoporous Materials, Vol. 151, 2012, p. 466 - 473.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Phase and morphological segregation in Ti-MCM-41

AU - Jayaratne, Vidura

AU - Chang, Lan-Yun

AU - Fang, Xi-Ya

AU - Chaffee, Alan

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N2 - 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.

AB - 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.

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