Microcalorimetric study of ethylene adsorption on the Pt{111} surface

✍ Scribed by Y.Y. Yeo; A. Stuck; C.E. Wartnaby; D.A. King

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 709 KB
• Volume: 259
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00787-7

✦ Synopsis

The reaction of C2H 4 on Pt{111} at 300 K has been investigated by single crystal adsorption calorimetry. The initial heats of adsorption and the initial sticking probability are 174 kJ/mol and 0.67 respectively. The adsorption heat versus coverage data shows a remarkable minimum which serves as a basis for a mechanism involving ethylidene (CHCH 3) as an intermediate for the formation of ethylidyne (C2H 3) on the Pt{111} surface. The coverage-dependent sticking probability strongly indicates that adsorption is precursor mediated and is well-fitted by the King and Wells expression. From the structure of the decomposition species known to form on the Pt{111} surface, the average C-Pt bond strength is found to be about 245 kJ/mol, although the actual value is found to be species-dependent.