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Adsorption and dissociation of ammonia on clean and metal-covered TiO2 rutile (1 1 0) surfaces: A comparative DFT study

Paper ID Volume ID Publish Year Pages File Format Full-Text
46929 46453 2011 10 PDF Available
Title
Adsorption and dissociation of ammonia on clean and metal-covered TiO2 rutile (1 1 0) surfaces: A comparative DFT study
Abstract

We have used density functional theory (DFT) to investigate the adsorption and first dissociation step of ammonia on both clean and Pt-covered TiO2 rutile (1 1 0) surfaces. On clean rutile TiO2 (1 1 0) surface, NH3 and NH2 prefer to chemisorb on the five-coordinated titanium (Ti5c) site, and H is adsorbed favorably on the bridging oxygen (O1) site, while a single Pt atom prefers to adsorb on the hollow (H2) site. It is found that the preadsorbed Pt atom enhances significantly the adsorption of NH3, NH2 and H species on rutile TiO2 (1 1 0) surface by binding with Pt adatom directly. It is also found that the first dissociation step of ammonia (NH3 ≥ NH2 + H) on the clean rutile TiO2 (1 1 0) surface is endothermic by 0.89 eV, and no transition state exists. In addition, the first dissociation step of ammonia on Pt-covered rutile TiO2 (1 1 0) surface is found to be endothermic by only 0.43 eV, but presents an activation energy barrier of 1.82 eV. A comparison of the adsorption and first dissociation step of ammonia on rutile TiO2 (1 1 0) surface with and without Pt adatom has been discussed. Investigations indicate that the adsorbed Pt adatom on clean rutile TiO2 (1 1 0) surface not only changes the surface electron structure, but also varies the reaction pathways by participating in the reaction. It is expected that our results would provide useful information for the development of catalyst for NH3 dissociation.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights• Comparative study on dissociation of NH3 on clean and Pt-covered TiO2 surfaces. • Pt adatom on rutile TiO2 enhances the adsorption of the species. • Pt adatom on rutile TiO2 can vary the reaction pathways of NH3 dissociation.

Keywords
68.43.Bc; 82.45.Jn; 82.65.+rRutile TiO2; Dissociation of ammonia; Platinum; DFT calculation
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Adsorption and dissociation of ammonia on clean and metal-covered TiO2 rutile (1 1 0) surfaces: A comparative DFT study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 3–4, 11 August 2011, Pages 510–519
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