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Structural effects of titanium(IV) oxide encapsulated in a hollow silica shell on photocatalytic activity for gas-phase decomposition of organics

Paper ID Volume ID Publish Year Pages File Format Full-Text
42277 45918 2009 6 PDF Available
Title
Structural effects of titanium(IV) oxide encapsulated in a hollow silica shell on photocatalytic activity for gas-phase decomposition of organics
Abstract

TiO2 particles encapsulated in hollow silica shells with controlled shell thicknesses were fabricated. Compared to naked TiO2 without coverage by a hollow silica shell, all of these composites showed low levels of photocatalytic activity for gas-phase decomposition of acetone into CO2. The activities over these composites tended to decrease with increase in thickness of the lateral silica shell. These results can be explained by a decrease in the diffusion of acetone with increase in thickness of the silica shell, leading to hampering of supply of the substrate to the surfaces of core TiO2 particles. In contrast, for the overall photodecomposition of gaseous 2-propanol into CO2, the presence of the lateral silica shell was found to be beneficial, i.e., the composite induced a high level of activity compared to the activity of naked TiO2. The enhancement of activity for this reaction was likely to be due to condensation of the intermediate product of acetone in the void spaces, leading to an increase in the collision probability between acetone and the surface of the TiO2 core.

Graphical abstractPhotocatalytic activities of TiO2 particles encapsulated in hollow silica shells for gas-phase decomposition of acetone and 2-propanol were investigated. Compared to the naked TiO2 sample, acetone decomposition on these composites did not occur efficiently, but overall decomposition of 2-propanol into CO2 did occur efficiently. Suppression of the diffusion of reaction substrates/intermediates by the lateral silica shell induced these unique behaviors.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photocatalysis; Titanium(IV) oxide; Core-shell structure; Hollow porous silica; Gaseous photodecomposition; Carbon dioxide
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Structural effects of titanium(IV) oxide encapsulated in a hollow silica shell on photocatalytic activity for gas-phase decomposition of organics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 369, Issues 1–2, 15 November 2009, Pages 113–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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