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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
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  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Quantitative analysis of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides by the linear combination of XANES

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Title
Quantitative analysis of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides by the linear combination of XANES
Other Titles
Quantitative analysis of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides by the linear combination of XANES
Author
Kim, Won BaeChoi, Sun HeeLee, Jae Sung
Keywords
X-RAY-ABSORPTION; SILICA MIXED OXIDES; EDGE FINE-STRUCTURE; SPECTROSCOPIC CHARACTERIZATION; TIO2-SIO2 GLASSES; K-EDGE; V2O5/TIO2/SIO2 CATALYSTS; GEL METHOD; TITANIA; COORDINATION
Issue Date
2000-09
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.104, no.36, pp.8670 - 8678
Abstract
X-ray absorption near edge structure (XANES) of Ti K-edge of Ti-Si mixed oxides and titania supported on silica with various Ti contents was studied to investigate the fractions of Ti-O-Si and Ti-O-Ti bonds quantitatively by fitting the preedge of Ti K-edge with the linear combination of two reference XANES spectra. In mixed oxides, the fraction of Ti-O-Ti was increased up to 0.55 when Ti/Si was varied from 0.04 to 0.5. The greatest change of each fraction occurred around 0.15-0.2 of Ti/Si, which was coincident with the formation of anatase titania as observed by XRD. For titania supported on silica with a surface area of 300 m(2) g(-1), the preedge fitting results combined with XRD and XPS indicated that monolayer coverage was reached around 7-10 wt % Ti loading where the amount of Ti in Ti-O-Si was saturated to 0.56 mmol-Ti/g-material. This work demonstrated the possibility of the quantification of Ti-O-Si and Ti-O-Ti bonds in Ti-Si binary oxides by using the linear combination of reference XANES spectra
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DOI
10.1021/jp000042+
ISSN
1520-6106
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ECHE_Journal Papers
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