高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (6): 873.

• 论文 • 上一篇    下一篇

SO42-/TiO2和SO42-/Fe2O3固体超强酸研究

高滋, 陈建民   

  1. 复旦大学化学系, 上海, 200433
  • 收稿日期:1993-08-25 修回日期:1993-11-30 出版日期:1994-06-24 发布日期:1994-06-24
  • 通讯作者: 高滋,女,60岁,教授.
  • 作者简介:高滋,女,60岁,教授.
  • 基金资助:

    国家基础研究重大课题;中国石油化学工业总公司资助

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

GAO Zi, CHEN Jian-Min   

  1. Department of Chemistry, Fudan University, Shanghai, 200433
  • Received:1993-08-25 Revised:1993-11-30 Online:1994-06-24 Published:1994-06-24

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摘要： 用XRD、TG-DTG、SEM和化学分析等手段研究了浸渍H2SO4的无定形TiO2和Fe2O3在焙烧过程中的晶化、相变、失水及失硫情况,总结出SO42-/MxOy型固体超强酸具有与SO42-/ZrO2体系相同的形成规律；用IR光谱和常温正戊烷异构化反应对SO42-/TiO2和SO42-/Fe2O3的超强酸性进行了表征,表明它们与/ZrO2体系具有相似的表面酸位结构,无水状态主要为L酸位,吸水后部分L酸位可转变为B酸位,但这两种体系的超强酸性均比SO42-/ZrO2弱,其H0大约在-13～-14之间。

关键词: SO42-/TiO2, SO42-/Fe2O3, 超强酸, 形成规律, 酸位结构

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 SO42-/ZrO2, it was concluded that the regularity of formation of all types of SO42-/MxOy superacids is similar.The superacidity of the SO42-/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 SO42-/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 SO42-/TiO2 and SO42-/Fe2O3 is weaker than that of SO42-/ZrO2, their acid strength H0 is estimated in the range of -13─ -14.

Key words: SO42-/TiO2, SO42-/Fe2O3, Superacid, Regularity of formation, Acid site structure

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