Butane Isomerization on SO42- Promoted Mixed Oxide Superacid Catalysts

Abstract

Abstract: Butane isomerization was catalyzed by a series of SO₄^2-promoted mixed oxide superacid catalysts.Incorporation of Ni, Fe, Mn, or Vinto ZrO₂ as a second or third metal component may enhance the isomerization activity of the catalysts under N₂ atmosphere, but the catalyst deactivation is rapid.Change to H₂ atmosphere can slow the coke formation and improve the activity and selectivity of some mixed oxide catalysts.Supporting Pt is of advantage for enhancing the activity and selectivity of SO₄^2- ZrO₂, but it does not work for the mixed oxide catalysts.In the course of reaction under atmosphere, the valence states of incorpordted metal components are unaltered as examined by XPS.The amount of coke deposited on the catalysts is related to their stability, and their initial activities are completely recovered after burning off the coke.Coking is probably the main reason for rapid catalyst deactivation.

Key words: SO₄^2-promoted mixed oxide catalyst, Superacid, n-Butane isomerization, Deactivation, Regeneration

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MIAo Chang-Xi, GAO Zi. Butane Isomerization on SO₄^2- Promoted Mixed Oxide Superacid Catalysts[J]. Chem. J. Chinese Universities, 1997, 18(3): 424.

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Butane Isomerization on SO₄^2- Promoted Mixed Oxide Superacid Catalysts

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