A solid superacid catalyst with an acid strength of Ho d -14.52 was obtained by impregnating Zr(OH), or amorphous Zr02 with aqueous ammonium metatungstate followed by calcining in air a t 800-850 "C (13 wt.% W); this catalyst was active for the isomerisations butane to isobutane at 50 "C, and pentane to isopentane at 30 "C.
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