Ethylene adsorption on Pt/Au/SiO2 catalysts.
Shen, Jianyi; Hill, Josephine M.; Watwe, Ramchandra M.; Podkolzin, S. G.; Dumesic, J. A.
Catalysis Letters 60(1-2), 1-9 (1999)
Ethylene adsorption on a Pt/Au/SiO2 catalyst (2 wt% Pt; Au/Pt atomic ratio of 10) was studied using adsorption microcalorimetry and FTIR spectroscopy. Ethylene adsorption at 300 K on Pt/Au/SiO2 produced p-bonded, di-s-bonded, and ethylidyne species with an initial heat of 140 kJ/mol, compared to a heat of 157 kJ/mol for Pt/SiO2 on which only ethylidyne species formed. At 203 and 263 K, ethylene adsorbed on Pt as well as on Au surface atoms for the Pt/Au/SiO2 catalyst. Quantum chemical DFT calculations indicate that Au exerts a significantly smaller electronic effect on Pt than does addition of Sn to Pt.
Department of Chemical Engineering, University of Wisconsin, Madison, WI 53706, USA.
Baltzer Sci Publ BV, Amsterdam
CODEN: CALEER, ISSN: 1011-372X, CAN 131:242956, AN 1999:512101
Animation of DFT calculations