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Efficient photodecomposition of gaseous organics catalyzed by titanium(IV) oxide encapsulated in a hollow silica shell with high porosity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42328 45920 2009 5 PDF Available
Title
Efficient photodecomposition of gaseous organics catalyzed by titanium(IV) oxide encapsulated in a hollow silica shell with high porosity
Abstract

A composite of titanium(IV) oxide (TiO2) particles (core) and nanoporous silica (shell) was prepared by successive coating of a carbon layer and an octadecyl-functionalized silica layer on TiO2, followed by heat treatment to remove the organic components. Transmission electron microscope (TEM) observation and nitrogen (N2) sorption analyses showed that the composite has a unique rattle-type structure, i.e., TiO2 particles were encapsulated in the hollow silica shell having well-developed porosity. When the photocatalytic activity for gas phase decomposition of acetone over the composite was compared with that over naked TiO2 without the lateral silica shell, the activity over the composite tended to become higher than that over naked TiO2 as the initial amount of acetone in the system was reduced. The enhancement of decomposition rate under a diluted condition was due to condensation of acetone on the lateral silica shell, which resulted in enhancement of the collision rate between the substrate and the surface of the TiO2 core.

Graphical abstractA composite of titanium(IV) oxide (TiO2) particles (core) and nanoporous silica (shell) was prepared. The composite showed high photocatalytic activity for gas phase decomposition of acetone under a diluted condition due to condensation of acetone on the lateral silica shell. Such condensation resulted in enhancing the collision frequency between the substrate and the TiO2 surface.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photocatalysis; Titanium(IV) oxide; Core–shell structure; Hollow porous silica; Condensation of substrates; Gaseous photodecomposition; Carbon dioxide
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Efficient photodecomposition of gaseous organics catalyzed by titanium(IV) oxide encapsulated in a hollow silica shell with high porosity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 216–220
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