Studies on SO42-/TiO2 and SO42-/Fe2O3 Solid Superacid Systems

Abstract

Abstract: The crystallization, phase transition, dehydration and desulfuration of amorphous TiO₂ and Fe₂O₃ impregnated with H₂SO₄ during calcination were studied by using XRD, TG-DTG, SEMand chemical analysis methods.Comparing the experimental results with that of SO₄^2-/ZrO₂, it was concluded that the regularity of formation of all types of SO₄^2-/M_xO_y superacids is similar.The superacidity of the SO₄^2-/TiO₂ and/Fe₂O₃ sampleswas charac terized by IRspectroscopy and n-pentane isomerization reaction at ambient temperature.Their acid site structure is the same as that of SO₄^2-/ZrO₂.For the dehydrated samples the main acid sites are Lewis type acid sites, which may be transformed into Bronsted type acid sites when the samples are partially hydrated.The superacidity of SO₄^2-/TiO₂ and SO₄^2-/Fe₂O₃ is weaker than that of SO₄^2-/ZrO₂, their acid strength H₀ is estimated in the range of -13─ -14.

Key words: SO₄^2-/TiO₂, SO₄^2-/Fe₂O₃, Superacid, Regularity of formation, Acid site structure

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GAO Zi, CHEN Jian-Min. Studies on SO₄^2-/TiO₂ and SO₄^2-/Fe₂O₃ Solid Superacid Systems[J]. Chem. J. Chinese Universities, 1994, 15(6): 873.

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Studies on SO₄^2-/TiO₂ and SO₄^2-/Fe₂O₃ Solid Superacid Systems

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