A fast as well as a slow component was observed in the room temperature adsorption of H2 and O2 on Rh on rutile and anatase TiO2 catalysts. Both components of the H2 adsorption decreased in magnitude with increasing catalyst reduction temperature, while the fast O2 adsorption increased in magnitude and the slow O2 adsorption stayed constant. The fast H2 adsorption proved to be due to chemisorption on the metal and the slow H2 adsorption to spillover from the metal to the support. The fast O2 adsorption was due to chemisorption on the metal as well as on the support, with the concurrent reoxidation of Ti3+ ions formed during H-spillover. The slow O2 adsorption was caused by corrosive chemisorption of the metal particles.
|Title of host publication||Strong metal-support interactions : developed from a symposium sponsored by the Divisions of Petroleum Chemistry, Inc., Industrial and Engineering Chemistry ... at the 189th Meeting of the American Chemical Society, Miami Beach, Florida, April 28 - May 3, 1985|
|Editors||R.T.K. Baker, S.J. Tauster, J.A. Dumesic|
|Place of Publication||Washington, DC|
|Publisher||American Chemical Society|
|Publication status||Published - 1986|
|Name||ACS Symposium Series|