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Vibrational study of ammonia adsorption on Pt/SiO2
Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96, Göteborg, Sweden, Dept. of Applied Surface Chemistry, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Grönbeck, H., Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96, Göteborg, Sweden, Department of Applied Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .ORCID iD: 0000-0002-2817-3574
Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96, Göteborg, Sweden, Dept. of Applied Surface Chemistry, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
2004 (English)In: Applied Surface Science, ISSN 0169-4332, Vol. 235, no 4, 487-500 p.Article in journal (Refereed) Published
Abstract [en]

Vibrational properties of surface species formed upon NH3 adsorption on Pt/SiO2, model system for the gas sensitive part in ammonia sensors based on field effect devices, have been investigated with in situ DRIFT spectroscopy. Experiments have been performed for a series of samples with different Pt loading at three temperatures, 50, 150 and 300°C, and in the absence and presence of oxygen. In addition, electronic structure calculations and vibrational analysis have been performed within the density functional theory (DFT) for NH3 and NH2 species adsorbed on platinum and hydroxylated silica model systems. Observations from both DRIFT spectra and DFT calculations indicate that NH3 is more strongly bound to platinum than to silanol groups on the SiO2 support. Vibrational modes assigned to NH2 appeared in the DRIFT experiments, indicative of NH3 dissociation, an interpretation supported by the calculations. Exposure of O2 was found to have minor effect on the vibrational spectrum at 50°C. However, at 150°C an increase of the vibration band assigned to the NH2 surface species was observed together with formation of gas phase N2O for samples with high platinum content. Thus, ammonia is oxidised over Pt at this temperature and oxygen is most likely facilitating ammonia dissociation. © 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2004. Vol. 235, no 4, 487-500 p.
Keyword [en]
DFT, DRIFT, Gas sensor, In situ FTIR, LCAO, NH3, Platinum, SiO2, Vibrational analysis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-45658DOI: 10.1016/j.apsusc.2004.03.225OAI: oai:DiVA.org:liu-45658DiVA: diva2:266554
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2014-01-09

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