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Nanodispersed TiO2 consisting of anatase and brookite phases in a ratio of 3 : 1 is obtained by the sol–gel method from titanium(IV) butoxide at a temperature below 100°C. X-ray diffraction, transmission electron microscopy, and Raman spectroscopy are used to show that the size of anatase particles is about 6 nm, and brookite particles consist of a crystal core, 4 nm in diameter, surrounded by an...
A method for the preparation of a SiO2–TiO2/Cr2O3(840) porous composite material in a block form with walls made of a silicate matrix and the interconnected channels of the matrix containing TiO2/Cr2O3(840) spherical hollow oxide composites was proposed. The specific surface area (Ssp) of the block composites was 212.2 m2/g, which is 20 times greater than the value of Ssp for spherical composites...
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