The activity of the RuO2-TiO2 and RuO2-SiO2 membrane catalysts in oxidation with air of the isopropylic alcohol was determined at temperatures ranging from 40 to 120 degrees C. The RuO2-TiO2 and RuO2-SiO2 membranes were prepared by the sol-gel process and supported on microporous glass membranes. The catalysts were characterized by scanning electron microscopy, IR spectroscopy and X-ray diffraction studies.