One step flame-made fluorinated Pt/TiO2 photocatalysts for hydrogen production

Mixed-phase nanocrystalline TiO2 photocatalysts produced by flame spray pyrolysis

“…6A, the correlation existing between the SSA of the here investigated FSP-made TiO 2 samples and the ϕ parameter adopted in their synthesis (void symbols) holds also for different FSP-made TiO 2 powders synthesized by different research groups (full symbols) using xylene as solvent/fuel and oxygen as dispersion gas [10,13,[27][28][29][30][31]. This highlights the pivotal role of the molar ratio between the dispersion oxygen and the titanium precursor fed into the burner in determining the powder properties and points to the ϕ parameter as a useful tool to tailor the properties of flame-made nanoparticles.…”

Photocatalytic CO 2 reduction vs. H 2 production: The effects of surface carbon-containing impurities on the performance of TiO 2 -based photocatalysts

“…The second, so-called photocatalytic step, was started by injecting CO 2 (6 mL) in the recirculating gas phase and irradiation was carried out for 3.75 h in the presence of water vapour and CO 2 . Each photocatalyst was tested three times, to check the reproducibility of the photocatalytic runs, in terms of CO 2 (in the cleaning step), CH 4 and CO production, determined by gaschromatographic analysis, after calibration [35,36].…”

“…The photocatalytic activity of the TiO 2 -based materials in both carbon dioxide photocatalytic reduction and hydrogen production by photo-steam reforming of methanol was tested using the benchscale apparatus [35,36], connected to a gas phase closed system, which is sketched in Fig. 1.…”

“…In the present work, a series of photocatalysts, including commercial and modified TiO 2 -based materials obtained by Cu grafting and/or surface deposition of platinum nanoparticles, were tested in a recirculating gas phase system [35,36], both under the typical experimental conditions of photocatalytic CO 2 reduction (namely in the presence of CO 2 and H 2 O in an inert gas) and in the photocatalytic production of H 2 through steam reforming of methanol. Our aim was to verify if the photoactivity of the tested materials in CO 2 photoreduction is correlated to their photoactivity in hydrogen production in the presence of methanol and to ascertain if carbonaceous impurities, mainly present in the form of carboxylates and (bi)carbonates on the photocatalyst surface [7,14], play a role in methane and CO evolution occurring under photocatalytic CO 2 reduction conditions.…”

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

“…Compared to its F-free counterpart, the resulting F-doped material appears to be more effi cient to photocatalytically produce H 2 from methanol under UV irradiation. It is worth noting that in this particular case, the ideal amount of F is 5 at% and an increase above 10% is detrimental to the photocatalytic activity due to the formation of structural defects improving charge carrier recombination (73).…”