Chemisorption of ethylene onto supported platinum/.gamma.-alumina and silver/.gamma.-alumina as followed by solid-state static and CP/MAS carbon-13 and static proton NMR spectroscopy

The adsorption of ethylene onto two metal-supported catalyst systems is reported. The first is Pt on γ-Al 2 O 3 . Here is it found that high-resolution solid-state 13 C CP/MAS methods cannot be utilized to investigate the structure of the adsorbed species. This arises due to the near ferromagnetic character of platinum metal. However, this problem can be circumvented by examining the solid-state 1 H NMR. From this investigations, it is clear that the dominant species on the surface is ethylidyne