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The catalytic properties of iron- and manganese-promoted sulfated zirconia (SFMZ) for the isomerization ofn-butane to isobutane are investigated using various catalyst pretreatments and reaction conditions. Then-butane isomerization reactivity at 30°C is effected by calcination of the catalyst at 650°C in helium and vacuum treatment at room temperature indicating that superacidity is not likely to...