PT SIO2 SONOGELS - SYNTHESIS AND CHARACTERIZATION/

Ultrasound can be used in sol-gel synthesis as a source of energy whic h may modify the structural and chemical properties of the resulting g els. Pt/SiO2 sonogel catalysts were obtained and characterized by X-ra y diffraction and small angle X-ray scattering. It was found that the aging and polymerization mechanisms are altered by ultrasound. The cat alysts were then tested in phenylacetylene hydrogenation, showing a hi gh selectivity toward styrene.