Paper SS-WeM12
Scanning Tunneling Microscopy Investigation of the Conversion of Propylene and Butylene to Carbon Clusters on Pt(111)
Wednesday, October 31, 2012, 11:40 am, Room 21
| Session: |
Chemisorption on Metallic Surfaces |
| Presenter: |
G.F. Sun, University of California Irvine |
| Authors: |
G.F. Sun, University of California Irvine
S.S. Khan, University of California Irvine
A.B. De la Ree, University of California Irvine
J.C. Hemminger, University of California Irvine
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| Correspondent: |
Click to Email |
Thermal dehydrogenation of propylene and butylene adsorbed on Pt(111) has been studied under ultra-high vacuum (UHV) conditions
using scanning tunneling microscopy (STM). After heating to 700 K the alkenes dehydrogenated to form flat, uniform sized circular carbon clusters with less than a monolayer coverage. With cycles of continued adsorption and heating, particles grew in number but not in size. The catalytic activity stopped by the third saturation dose, leaving areas of bare Pt. Clusters of propylene and butylene were 12 ± 1.2 Å and 13 ± 1.0 Å in diameter, respectively. Propylene and butylene clusters contain an average of 44 and 51 carbons atoms per cluster, respectively.