Island Formation During Kinetic Rate Oscillations in the Oxidation of CO over Pt/SiO2: A Transient Fourier Transform Infrared Spectrometry Study
Engineering, Chemical Engineering, Catalysis and Reaction Engineering, Physical Sciences and Mathematics, Engineering Physics
Thin polystyrene films were formed on polycrystalline platinum by styrene deposition followed by UV-initiated polymerization under cryogenic, ultrahigh-vacuum conditions. Temperature-programmed desorption (TPD) experiments showed that styrene chemisorbs weakly on the Pt surface. In the temperature region of 115−145 K, the adsorbed styrene films undergo a crystallization process that can be described by the Avrami equation. The polymerization rate increased with incident UV intensity, as expected, but was found to decrease with increasing temperature, most likely the result of competition between crystallization and polymerization. Ex-situ analysis of the resulting polystyrene films showed that high molecular weight polymer is formed. Finally, it is shown that the thickness can be reproducibly controlled by controlling the initial monomer dosage.
Digital Object Identifier (DOI)
Published in Journal of Catalysis, Volume 204, Issue 1, 2001, pages 35-52.
© Journal of Catalysis, 2001, Elsevier
Fanson, T.P., Delgass, N.W., Lauterbach, A.J. (2001). Island formation during kinetic oscillations in the oxidation of CO over Pt/SiO2: A time-resolved FTIR study. Journal of Catalysis, 204(1), 35-52.