Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) has been used to study acetone adsorption over AlPON catalysts from room temperature (RT) to 630degreesC. DRIFTS reveals that acetone is weakly adsorbed at RT, with the surface P-OH and Al-OH groups of the solid playing a significant role in this process. However, no evidence of the participation of any surface nitrogeneous species (N3-, -NH, -NH2 or NH3) was obtained. At 262degreesC, a surface enolate species and diacetone alcohol are detected. Cracking of gaseous acetone begins at 518degreesC producing CO and CH4.