Synthesis of mesoporous titania in rutile phase with pore-stable structure

AUTOR(ES)

Santos, J. G. dos, Ogasawara, T., Corrêa, R. A.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2009-09

RESUMO

Metastable-to-stable transformation in oxides is always associated with drastic reduction in surface area and/or porosity. Therefore, all earlier efforts to stabilize the pore structure of oxides undergoing a metastable-to-stable phase transformation are interesting for both scientific and technological concerns. This work presents a new experimental technique for catalytic oxide production through sonication in acid solution for attainment of the anatase-rutile transformation. Mesoporous structure of titania and surface area were stabilized in the rutile phase after calcinations at 430 and 730ºC. Analysis by scanning electron microscopy (SEM) and nitrogen isotherms showed that the mesoporous structure was preserved after calcinations. After the sonication of titania for 32 hours, rutile phase was obtained at 730ºC and still kept a surface area of 28m²/g. When sonicated for 64 h, rutile was obtained at 430ºC, still preserving an area of 52m²/g.

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