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Role of support on the photocatalytic activity of titanium oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
41547 45892 2010 8 PDF Available
Title
Role of support on the photocatalytic activity of titanium oxide
Abstract

We demonstrate an enhanced photocatalytic activity for TiO2 when it is dispersed on ZrO2 and zeolite compared to that dispersed on Al2O3 and CeO2. In these composite systems, TiO2 exists as a dispersed particulate phase and the extent of dispersion is the highest on ZrO2 support. Na–Y zeolite possesses the maximum Lewis acidity followed by ZrO2, Al2O3 and CeO2. Optical absorption property of TiO2 dispersed on ZrO2, zeolite and CeO2 is better than that of unsupported TiO2. In the above mentioned systems, photocatalytic activity of TiO2 shows a strong dependence on the surface acidity of the support. A significantly high photocatalytic activity for hydrogen generation from water–methanol mixture is observed for the TiO2–ZrO2 system. The enhanced activity of TiO2 dispersed on ZrO2 is attributed to the enhanced optical absorption and increased life time of the photogenerated charge carriers assisted by the surface acidic sites. Present study leads to a new result that a highly dispersed phase of TiO2 on a support having higher surface acidity exhibits enhanced photocatalytic activity. This strategy may be useful for the design of new catalysts yielding high photocatalytic activity. Presence of a co-catalyst like Pd metal enhances the photocatalytic activity further.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (207 K)Download as PowerPoint slideResearch highlights▶ Photocatalytic activity of TiO2 gets altered when it is supported on various oxides. ▶ Improved optical absorption is observed for TiO2-ZrO2, TiO2-zeolite and TiO2-CeO2. ▶ Photocatalytic activity of TiO2 shows a strong dependence on the acidity of support. ▶ Life time of the charge carriers in supported TiO2 is different from pristine TiO2. ▶ Surface acidic sites enhance the charge separation leading to enhanced activity.

Keywords
Photocatalysis; Titanium oxide; Support; Hydrogen; Surface acidity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 245–252
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