BUTANE ISOMERIZATION ON SO42- PROMOTED MI XED-OXIDE SUPERACID CATALYSTS

Butane isomerization was catalyzed by a series of SO42- promoted mixed oxide superacid catalysts, Incorporation of Ni, Fe, Mn, or V into ZrO 2 as a second or third metal component may enhance the isomerization a ctivity of the catalysts under N-2 atmosphere, but the catalyst deacti vation is rapid, Change to H-2 atmosphere can slow the coke formation and improve the activity and selectivity of some mixed oxide catalysts , Supporting Pr is of advantage for enhancing the activity and selecti vity of SO42-/ZrO2, but it does not work for the mixed oxide catalysts , In the course of reaction under atmosphere, the valence states of in corporated metal components are unaltered as examined by XPS, The amou nt of coke deposited on the catalysts is related to their stability, a nd their initial activities are completely recovered after burning off the coke, Coking is probably the main reason far rapid catalyst deact ivation.