Vibrational Study of SOx Adsorption on Pt/SiO2
Journal article, 2014
The formation of ad-SOx species on Pt/SiO2 upon exposure to SO2 in concentrations rang- ing from 10 to 50 ppm at between 200 and 400◦C has been studied by in situ diffuse reflectance infrared Fourier transformed spectroscopy. In parallel, first-principles calculations have been carried out to consolidate the experimental interpretations. It was found that sulfate species form on the silica surface with a concomitant removal/ rearrangement of silanol groups. For- mation of ad-SOx species occurs only after SO2 oxidation to SO3 on the platinum surface. Thus SO2 oxidation to SO3 is the first step in the SOx adsorption process, followed by spillover of SO3 to the oxide and, finally, the formation of sulfate species on the hydroxyl positions on the oxide. The sulfate formation is influenced by both temperature and SO2 concentration. Furthermore, exposure to hydrogen is shown to be sufficiently efficient as to remove ad-SOx species from the silica surface.
Sensor
Combustion
Hydrogen
Sulfur-Dioxide
Ir Spectroscopy
Surface-Acidity
Methane
Silica
Field-Effect Transistor
Platinum
Author
Djamela Bounechada
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Zhafira Darmastuti
Linkopings universitet
Mike Andersson
Linkopings universitet
Lars Ojamäe
Linkopings universitet
Anita Lloyd Spetz
Linkopings universitet
Magnus Skoglundh
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Per-Anders Carlsson
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Journal of Physical Chemistry C
1932-7447 (ISSN) 1932-7455 (eISSN)
Vol. 118 51 29713-29723Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories (SSIF 2011)
Physical Chemistry
Chemical Process Engineering
Atom and Molecular Physics and Optics
Roots
Basic sciences
DOI
10.1021/jp506644w