A highly active superacid of 8 mass% Pt-supported ZrO2 for the skeletal isomerization of butane to isobutane is obtained by impregnating zirconia gel with 0.5 mol dm–3 H2SO4 followed by drying, impregnating the sulfated gel with a solution of H2PtCl6, and finally calcining in air at 600 °C.
M. Hino and K. Arata, J. Chem. Soc., Chem. Commun., 1995, 789 DOI: 10.1039/C39950000789
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