FTIR study of formic acid interaction with TiO2 and TiO2 doped with Pd and Cu in photocatalytic processes

Fourier-Transform Infrared and Raman Spectroscopy of Pure and Doped TiO2 Photocatalysts

“…Evidence for coordinated carbonate formation has been reported by several authors [18,20,132,148]. Reported band frequencies and assignments of (bi)carbonate on various TiO 2 nanoparticles are compiled in Table 8.2.…”

“…Such correlations were inferred by Mattsson et al [19], which correlated their vibrational data with DFT calculations (Table 8.3). In several of these studies (bi)carbonate and aldehyde complex formation was reported [19,148,158]. As noted in Section 8.5.1.1 unambiguous assignment of aldehyde species only based on IR spectra is complicated in this context since many peaks overlap with formate and carbonyl bands.…”

“…The authors suggested that the increased activity of Fe-TiO 2 was due to the formation of easily photolyzed ferrioxalate complexes rather than red-shift of the bandgap energy. Arana et al [148,156,158] conducted a series of experiments on the interaction of HCOOH with wet impregnated Fe [156,158], Pd and Cu (Ref. [148]) anatase or mixed-phase anatase/rutile (Degussa P25) TiO 2 nanoparticles in aqueous solutions.…”

“…Arana et al [148,156,158] conducted a series of experiments on the interaction of HCOOH with wet impregnated Fe [156,158], Pd and Cu (Ref. [148]) anatase or mixed-phase anatase/rutile (Degussa P25) TiO 2 nanoparticles in aqueous solutions. They employed FTIR spectroscopy to characterize the adsorbates and identify reaction intermediates.…”

“…High Fe loading was observed to be detrimental for the photoreactivity. Upon adsorption of HCOOH on TiO 2 impregnated with Fe, Pd and Cu nanoparticles, a strong correlation with the metal type and the reactivity was observed, which affected the HCOOH bonding to the catalyst and the vibrational frequency of the formate species [148,156].…”