Porous solids from layered clays by combined pillaring and templating approaches

Zhu, H.Y., Ding, Z. and Barry, J.C. (2002) Porous solids from layered clays by combined pillaring and templating approaches. Journal of Physical Chemistry B, 106 44: 11420-11429. doi:10.1021/jp014463i


Author Zhu, H.Y.
Ding, Z.
Barry, J.C.
Title Porous solids from layered clays by combined pillaring and templating approaches
Journal name Journal of Physical Chemistry B
ISSN 1520-6106
1089-5647
Publication date 2002-11-07
Sub-type Article (original research)
DOI 10.1021/jp014463i
Volume 106
Issue 44
Start page 11420
End page 11429
Total pages 10
Place of publication Washington, DC. U.S.A.
Publisher American Chemical Society
Collection year 2002
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
779999 Other
Abstract The pore structure formation in bentonite, pillared with a mixed sol of silicon and titanium hydroxides and treated subsequently with quaternary ammonium surfactants, is investigated. The surfactant micelles act as a template, similar to their role in MCM41 synthesis. Because both the surfactant micelles and the sol particles are positively charged, it is greatly favorable for them to form meso-phase assembles in the galleries between the clay layers that bear negative charges. Besides, the sol particles do not bond the clay layers strongly as other kinds of pillar precursors do, so that the treatment with surfactants can result in radical structure changes in sol-pillared clays. This allows us to tailor the pore structure of these porous clays by choice of surfactant. The surfactant treatment also results in profound increases in porosity and improvement in thermal stability. Therefore, the product porous clays have great potential to be Used to deal with large molecules or at high operating temperatures. We also found that titanium in these samples is highly dispersed in the silica matrix rather than existing in the form of small particles of pure titania. Such highly dispersed Ti active centers may offer excellent activities for catalytic oxidation reactions such as alkanes into alcohols and ketones.
Keyword Chemistry, Physical
Model Mesoporous Adsorbent
Titanium Silicalite
Hydrogen-peroxide
Molecular-sieve
Montmorillonite
Adsorption
Mcm-41
Particles
Glasses
Gel
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Microscopy and Microanalysis Publications
 
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Created: Tue, 14 Aug 2007, 18:51:49 EST