Direct Observation of Room Temperature Propylene Adsorption and Rehybridization on Supported Silver Using Synchrotron Radiation
J T. Ranney, Daniel A. Fischer, D H. Parker, R G. Bowman, G E. Hartwell, J L. Gland
The room-temperature chemisorption and rehybridization of propylene on dispersed silver supported on TiO2 [anatase] has been observed for the first time. Adsorbed organic intermediates are likely to play an important role in catalytic partial oxidation and their characterization is a key step in the understanding of catalytic mechanisms at a molecular level. Carbon K edge x-ray absorption spectroscopy is a powerful method for establishing the bonding of organic overlayers on supported materials. The intensity of propylene's C 1s to π* resonance is nearly extinguished upon chemisorption at 300 K indicating rehybridization of the C-C double bond to a sigma bonded intermediate. Complete desorption occurs by 475 K. Propylene does not adsorb on either neat TiO2 support or on silver single crystals under these conditions. Therefore, the bonding on the supported silver is characteristic of the interactions between Ag and TiO2.
, Fischer, D.
, Parker, D.
, Bowman, R.
, Hartwell, G.
and Gland, J.
Direct Observation of Room Temperature Propylene Adsorption and Rehybridization on Supported Silver Using Synchrotron Radiation, Nature
(Accessed June 10, 2023)