1H and 129Xe nuclear magnetic resonance studies of hydrogen chemisorption on supported platinum Application to the metal dispersion and spillover

✍ Scribed by D. Rouabah; J. Fraissard

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 994 KB
• Volume: 3
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/0926-2040(94)90010-8

✦ Synopsis

Chemisorption of hydrogen, electron microscopy and 'H nuclear magnetic resonance (NMR) have confirmed that the chemical shift of hydrogen chemisorbed on platinum is directly related to the size of the metal particles. The influence of the hydrogen adsorbate concentration and the chemisorption temperature on the chemical shift 6, and the distribution of the hydrogen chemisorbed on these particles have been determined. This study also shows how the dispersion can be deduced from the variation of 6, with the H, concentration and clarifies the effect of temperature on the concentration of spillover H,. lz9Xe NMR of adsorbed xenon used as a probe confirmed most of the previous results.