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    Effect of Ethylene and Hydrogen Adsorption on the E.S.R. Spectra of Chromia-Alumina Catalysts
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (10), 1977) Ashmawy, Fathy M.; Steiner, Herbert M.
    The surface chemistry of Cr2+ and Cr3+ in chromia–alumina catalyst is investigated. Electron spin resonance studies revealed considerable changes in the behaviour of the signals ascribed to Cr3+(at g= 1.986) when exposed to H2, C2H4 and water vapour at 373 K. This work, when combined with the results from adsorption studies, allows some speculation upon the mode of adsorption of the gaseous species on the chromium ions.
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    Adsorption of hydrogen on a platinum–graphite catalyst. Part 1.—Electron spin resonance measurement in the gas–solid system
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (08), 1978) Katayama, Akiko; Kita, Hideaki
    E.s.r. signals from a platinum–graphite catalyst (Pt–graphite) and pure graphite were observed as functions of hydrogen gas pressure, temperature and the amount of platinum. The signals were inferred to be due to conduction charge carriers. The e.s.r. signal of Pt–graphite exhibits behaviour similar to that of pure graphite with respect to the temperature variation of the g∥ value. The signal from pure graphite was not affected by the presence of hydrogen gas. However, the signal from Pt–graphite at g=ge(g value of a free electron) decreased with the amount of platinum and increased with the increment in hydrogen gas pressure, obeying the non-dissociative Langmuir isotherm. Detailed analysis indicated that the adsorption of hydrogen on Pt–graphite causes a change in the number of conduction electrons. Adsorbed hydrogen on Pt–graphite is concluded to be positively polarized in molecular form.