| 摘要 |
<p>The present invention relates to a titanium dioxide composition modified with urea in the stage of the titanium hydroxide precipitation from an aqueous solution. The aqueous solution, contains a mixture of dissolved sulfate salts, including titanyl sulfate, following a hydrothermal treatment of the precipitated titanium hydroxide in its mother liquor. The modification of said titanium dioxide is carried out with a basic silica sol in the stage of the formed titanium hydroxide or dried titanium dioxide. The titanium dioxide composition is characterized by an enhanced thermal and hydrothermal stability of the pore structure, a developped mesopore structure, a decreased sulfur content and a specific surface area formed by pores with a diameter up to 490 m2g-1 for a calcined material at a temperature of 800 °C for 3 hours.</p> |
