Characterization of pore structure and coordination of titanium in TiO2 and SiO2-TiO2 sol-pillared clays

Ding, Z., Zhu, H. Y., Greenfield, P. F. and Lu, G. Q. (2001) Characterization of pore structure and coordination of titanium in TiO2 and SiO2-TiO2 sol-pillared clays. Journal of Colloid And Interface Science, 238 2: 267-272.


Author Ding, Z.
Zhu, H. Y.
Greenfield, P. F.
Lu, G. Q.
Title Characterization of pore structure and coordination of titanium in TiO2 and SiO2-TiO2 sol-pillared clays
Journal name Journal of Colloid And Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2001
Sub-type Article (original research)
DOI 10.1006/jcis.2001.7504
Volume 238
Issue 2
Start page 267
End page 272
Total pages 6
Editor D. Wasan
Place of publication USA
Publisher Academic Press
Collection year 2001
Language eng
Subject C1
291804 Nanotechnology
670707 Inorganic industrial chemicals
Abstract Titania sol-pillared clay (TiO2 PILC) and silica-titania sol-pillared clay (SiO2-TiO2 PILC) were synthesized by the sol-gel method. Supercritical drying (SCD) and treatment with quaternary ammonium surfactants were used to tailor the pore structure of the resulting clay. It was found that SCD approach increased the external surface area of the PILCs dramatically and that treatment with surfactants could be used to tailor pore size because the mesopore formation in the galleries between the clay layers follows the templating mechanism as observed in the synthesis of MCM-41 materials. Highly mesoporous solids were thus obtained. In calcined TiO2 PILC, ultrafine crystallites in anatase phase, which are active for photocatalytic oxidation of organics, were observed. In SiO2-TiO2 PILCs and their derivatives, titanium was highly dispersed in the matrix of silica and no crystal phase was observed. The highly dispersed titanium sites are good catalytic centers for selective oxidation of organic compounds. (C) 2001 Academic Press.
Keyword Chemistry, Physical
Titania Sol
Silica Sol
Pillared Clays
Supercritical Drying
Surfactant Templating
Catalytic Activity
Montmorillonite
Oxide
Oxidation
Particles
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Tue, 14 Aug 2007, 16:10:47 EST