SrTiO₃ was prepared by using sol-gel method which involve hydrolysis of alkoxide mixtures in an alcohol-toluene solvent. The product was then characterized by XRD and other techniques. The adsorption and photocatalytic oxidation reaction of acetaldehyde was studied on these aerogel prepared SrTiO₃ nanoparticles using in situ FT-IR spectroscopy in a specially designed stainless steel UHV cell. The photooxidation involved UV-Vis irradiation in the range of 2.1 to 5.0 eV. It has been found that a large fraction of acetaldehyde physisorbed onto the surface at 173 K which upon oxygen exposure in the dark did not undergo further oxidation. However, in presence of UV light exposure, the aldehyde underwent oxidation forming some CO₂ and other oxidized species. The infrared assignments of all adsorbed species were used to explore the reaction mechanisms of photochemical reaction.

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