复合氧化物TiO2/SiO2性质研究

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复合氧化物TiO₂/SiO₂性质研究

周亚松; 姜国伟

State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200,
China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-06-28 发布日期:2002-06-28
通讯作者: 周亚松

Study on Properties of Composite Oxides TiO₂/SiO₂

ZHOU Yasong; JIANG Guowei

State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200,
China

Received:1900-01-01 Revised:1900-01-01 Online:2002-06-28 Published:2002-06-28
Contact: ZHOU Yasong

摘要/Abstract

摘要： The nanometer particles of TiO2 and TiO2/SiO2 oxides were prepared by sol-gel and
supercritical fluid drying method. The properties of TiO2 and TiO2/SiO2 were characterized
by means of BET(Brunner-EmmettTeller method), TEM(transmission electron microscopy), SEM
(scanning electron microscopy), XRD(X-ray diffraction) and FTIR(Fourier transform-infrared)
techniques. The effects of different preparation route, prehydrolysis and non-
prehydrolysis, on the properties of TiO2/SiO2 oxide were also examined. Experimental
results show that the thermal stability of pure TiO2 is improved greatly when it is mixed
with SiO2 in nanometer level. The composite TiO2/SiO2 oxides form Ti-O-Si chemical bonds,
which creates new BrSnsted acidity sites. The acidity character is related to TiO2/SiO2
chemical composition and preparation methods. The acidity of TiO2/SiO2 oxides by
prehydrolysis is greater than that of by non-prehydrolysis. Ti atom is rich on the surface
of TiO2/SiO2.

关键词: sol-gel;CO2 supercritical fluid drying;nanometer powder;TiO2/SiO2

Abstract: The nanometer particles of TiO2 and TiO2/SiO2 oxides were prepared by sol-gel and
supercritical fluid drying method. The properties of TiO2 and TiO2/SiO2 were characterized
by means of BET(Brunner-EmmettTeller method), TEM(transmission electron microscopy), SEM
(scanning electron microscopy), XRD(X-ray diffraction) and FTIR(Fourier transform-infrared)
techniques. The effects of different preparation route, prehydrolysis and non-
prehydrolysis, on the properties of TiO2/SiO2 oxide were also examined. Experimental
results show that the thermal stability of pure TiO2 is improved greatly when it is mixed
with SiO2 in nanometer level. The composite TiO2/SiO2 oxides form Ti-O-Si chemical bonds,
which creates new BrSnsted acidity sites. The acidity character is related to TiO2/SiO2
chemical composition and preparation methods. The acidity of TiO2/SiO2 oxides by
prehydrolysis is greater than that of by non-prehydrolysis. Ti atom is rich on the surface
of TiO2/SiO2.

Key words: sol-gel, CO2 supercritical fluid drying, nanometer powder, TiO2/SiO2

周亚松, 姜国伟. 复合氧化物TiO₂/SiO₂性质研究[J]. CIESC Journal.

ZHOU Yasong, JIANG Guowei. Study on Properties of Composite Oxides TiO₂/SiO₂[J]. .

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复合氧化物TiO₂/SiO₂性质研究

Study on Properties of Composite Oxides TiO₂/SiO₂

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