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Role of TiO2 surface hydration on NO oxidation photo-activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
28759 44090 2011 9 PDF Available
Title
Role of TiO2 surface hydration on NO oxidation photo-activity
Abstract

The paper highlights the role of TiO2 surface hydration in the conversion of nitric oxide, NO, under irradiation of UVA light. H2O desorption thermokinetics of TiO2 surface is studied to characterise the state of water on TiO2 and identify criteria for potential thermal dehydration. Hydrated and dehydrated surfaces are then studied for their ability to oxidise gaseous NO and emphasise the overall role of H2Oads and OHads groups and the differences between initial and transient regimes before reaching steady state. A model based on a rapid initial NO reactive photoadsorption is used to interpret the high initial removal of NO which develops in a lower NO conversion transient regime. The development of NO and NO2 profiles as a function of time coupled with the total NOx balance in the gas phase, also offer ways to understand deactivation phenomena at the catalyst surface.

► Link between photocatalytic oxidation performances of NO and state of water adsorbed on TiO2 surface. ► Validation of Langmuir–Hinshelwood kinetics for NO photocatalytic oxidation. ► Mechanism of NO oxidation on light irradiated TiO2 surfaces: influence of OH radicals. ► Factors influencing catalyst deactivation.

Keywords
TiO2; Nitric oxide; Nitrate; Surface hydration; Photoadsorption; Photocatalytic oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 220, Issues 2–3, 20 May 2011, Pages 85–93
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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