A solid superacid catalyst with an acid strength of H0⩽–16·04, which was active for reactions of propane and butane, was obtained by exposing Zr(OH)4, prepared by the hydrolyses of ZrOCl2 and ZrO(NO3)2, to 1 N H2SO4 and then calcining in air at 575–650 °C.
M. Hino and K. Arata, J. Chem. Soc., Chem. Commun., 1980, 851 DOI: 10.1039/C39800000851
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