Transition metal and lanthanoid ions supported on rutile have been used as catalysts for parahydrogen enrichment at 77 and 90 K. Activities, expressed in molecules ion–1 s–1, varied with the square of the magnetic moment of the cation. The results are explained by Wigner's theory extended to cover conversion proceeding during vibrational motion in the physically adsorbed state.
R. Rudham and A. D. Tullett, J. Chem. Soc., Faraday Trans. 1, 1975, 71, 2361 DOI: 10.1039/F19757102361
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