The decomposition of formic acid on Rh/TiO2 and Au/TiO 2 catalysts was examined at 300-473K with Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). Besides molecularly adsorbed HCOOH and formate species (produced in the HCOOH dissociation on the surfaces), formation of formaldehyde was detected by FTIR in the adsorbed layer. The surface concentration of formaldehyde depended on the nature of the metal, as well as on the reaction temperature. A part of formaldehyde desorbed from the adsorbed layer, another part, however, decomposed into H2 and CO. It is suggested that CO is not the product of the direct dehydration of HCOOH. CO is rather produced in the decomposition of formaldehyde originating from the deoxygenation of HCOOH.
- Formaldehyde formation
- Formic acid adsorption
- Mass spectrometry
- TiO supported Rh and Au catalysts
ASJC Scopus subject areas
- Process Chemistry and Technology