| Phase Transformation and Porosity Characteristics
of Chemically Modified Sol-Gel Titania with
Respect to Silica Addition |
Suresh C. Pillai, S. Rajesh Kumar, Asha K. Vasudevan, P. Krishna Pillai and K. G. K. Warrier
Pages : 81-83
DOI : 10.1080/0371750X.2000.10799938 |
| Abstract |
| Ti02-Si02 gels were prepared through the hydrolysis and
polycondensation of a mixture of titanium isopropoxide and tetra
ethoxy silane (TEOS) in presence of a gel modifier such as acetic
acid. The resultant titania-silica gel precursor was calcined
at various temperatures. An attempt has been made to correlate
the properties of the resultant oxide with silica content. The
amorphous to anatase and the anatase to rutile phase transition
was followed by X-ray diffraction studies. The specific surface
area of the resulting oxides was measured by BET method. 20%
silica addition enhanced the specific surface area of titania from
84 m2.g-1 to 345 m2.g-1
• The mesoporous nature of titania changes
to microporous one, after addition of silica. Anatase to rutile
transform11tion temperature has also been influenced by the
addition of silica. |
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