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XANES-PCA analysis of Ti-species in MCM-41 mesoporous silica synthesized by different method

Paper ID Volume ID Publish Year Pages File Format Full-Text
41701 45897 2011 5 PDF Available
Title
XANES-PCA analysis of Ti-species in MCM-41 mesoporous silica synthesized by different method
Abstract

MCM-41 mesoporous silica was prepared with Ti incorporated in the structure by two different ways: hydrothermal and atmospheric pressure by sol–gel method. To evaluate each synthesis, these materials were in situ investigated through X-ray absorption fine structure (XAFS) spectroscopy in different stages of the synthesis. X-ray absorption structure at the near edge region (XANES) gives the coordination of Ti and the relative concentration of Ti-species present in the mesoporous materials, obtained by different synthesis. The Principal Component Analysis (PCA) of XANES spectra indicate that mesoporous silica modified by Ti synthesized by hydrothermal method has species with majority of Ti tetrahedrally coordinated. This coordination is increased up to six when the sample is hydrated. In the case of the sol–gel synthesis, Ti-sites have higher mean coordination, independently from the degree of hydration.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slideResearch highlights► Ti-species grafted in the mesoporous of MCM-41 synthesized by different method. ► In situ and ex situ Ti-K-XANES study in combination with PCA and ITFA study. ► A complete determination about the kind and concentration of each Ti-species. ► By hydrothermal synthesis, Ti-MCM-41 has the majority of Ti tetrahedral-coordinated. ► In the case of the sol–gel synthesis, Ti-sites have higher average coordination.

Keywords
Ti-K-XANES; PCA/ITFA; Ti-MCMC-41; Hydrothermal synthesis; Sol–gel procedure
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XANES-PCA analysis of Ti-species in MCM-41 mesoporous silica synthesized by different method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 397, Issues 1–2, 30 April 2011, Pages 22–26
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us