AVS 46th International Symposium
    Surface Science Division Monday Sessions
       Session SS2-MoM

Paper SS2-MoM10
Adsorption of Propylene Oxide on Pt(111) Surfaces and its Reactions with Gaseous and Adsorbed H Atoms

Monday, October 25, 1999, 11:20 am, Room 607

Session: Catalysis on Metals
Presenter: J. Biener, Universität Bayreuth, Germany
Authors: A. Dinger, Universität Bayreuth, Germany
C. Lutterloh, Universität Bayreuth, Germany
J. Biener, Universität Bayreuth, Germany
J. Küppers, Universität Bayreuth, Germany
Correspondent: Click to Email
The adsorption of propylene oxide (PO) on Pt(111) surfaces and its reactions with gaseous and adsorbed H atoms, respectively, was studied with TDS and HREELS methods. Monolayer PO desorbs near 180 K, while multilayer PO desorbs at 130 K. Approximately 50% of the monolayer PO molecules dissociate leading to the desorption of CO and H@sub 2@. The decomposition of PO is initiated by a cleavage of the C-O-C ring. Gas phase H atoms react with PO monolayers on Pt(111) to n-propanol, i-propanol, and acetone with the latter as a minor product and about equal amounts of the alcohols. On the other hand, the reaction between PO and coadsorbed hydrogen leads to the selective formation of acetone.