Infrared Spectroscopic Study of the Photoinduced Activation of CO2 on TiO2 and Rh/TiO2 Catalysts

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

“…In situ DRIFTS studies also confirmed that CO 2 could be spontaneously dissociated into CO on reduced Rh/TiO 2-x (Rasko and Solymosi, 1994) or defective Cu(I)/TiO 2-x (P25) even in the dark. Fig.…”

“…When CO 2 interacts with TiO 2 surface sites (e.g., Ti 3+ ) and gains electrons from TiO 2 , CO 2 δ-species could be formed. The linear structure of CO 2 is then transformed to a bent form, where the C−O bond is likely broken (Rasko and Solymosi, 1994). Generally, the mechanism in the activation and subsequent reduction of CO 2 involves the participation of protons and electron transfer (one, two, or multiple electron process).…”

“…First, photoillumination induced a sustained electron transfer from the catalyst to the π orbital of adsorbed CO 2 . This process makes CO 2 more anionic, and thus induced the cleavage of the C-O bond (Rasko and Solymosi, 1994). Second, photoillumination could induce the regeneration of surface V O .…”

“…The adsorption and accommodation of CO 2 is not limiting the rate of CH 4 formation, while the production of protons and electrons, or the production of hydrogen atoms from H 2 O splitting is the rate limiting step in the overall process. Rasko and Solymosi (1994) suggested that the most important step in any reaction of CO 2 is the activation of rather inert and stable CO 2 involving an electron transfer to CO 2 .…”

Az etanol katalitikus átalakítása hordozós Rh katalizátorokon

“…Korábbi irodalmi adatokból tudjuk, hogy a CO 2 disszociál a hordozós Rh katalizátorok felületén és a disszociáció mértéke függ a hordozó anyagi minőségétől [107]. A redukció hőmérsékletének is jelentős hatása van.…”