AVS 46th International Symposium
    Surface Science Division Monday Sessions
       Session SS1+EM-MoM

Paper SS1+EM-MoM1
The Reactions of Maleic Anhydride Over TiO@sub 2@ (001) Single Crystal Surfaces

Monday, October 25, 1999, 8:20 am, Room 606

Session: Chemistry on Oxides
Presenter: J.N. Wilson, The University of Auckland, New Zealand
Authors: J.N. Wilson, The University of Auckland, New Zealand
D.J. Titheridge, The University of Auckland, New Zealand
H. Idriss, The University of Auckland, New Zealand
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The reactions of maleic anhydride have been investigated on the stoichiometric and substoichiometric surfaces of TiO@sub 2@ by Temperature Programmed Desorption (TPD) and Scanning Kinetic Spectroscopy (SKS). SKS technique, showing complementary information to TPD, has been successfully applied to investigate the chemical pathways on this oxide material for the first time. Results from the maleic anhydride TPD and SKS show the desorption of a wide variety of products in several temperature domains. In addition to the decomposition pathway to CO, CO@sub 2@, acetylene, and ethylene, the desorption of coupling reaction products of two molecules of acetylene to vinylacetylene (m/e 52) and of three molecules of acetylene to benzene (m/e 78) is observed. Moreover, the potential desorption of carbon suboxide, O=C=C=C=C=O, formed by two successive dehydration of both ends of the molecule, is discussed. The coupling pathways of the reactions of maleic anhydride on the substoichiometric surface were more accentuated.