| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 53868 | Catalysis Today | 2015 | 6 Pages |
•Photocatalytic NH3 oxidation was studied with different phase composition TiO2.•The effects of Pt nanoparticles deposition on the photocatalysts were investigated.•The selectivities to N2, nitrite and nitrate anions were monitored during the runs.•Pure brookite modified with Pt nanoparticles was most efficient in NH3 conversion.
The effects of the TiO2 crystal structure and its surface modification with Pt nanoparticles on the photocatalytic oxidation of NH3 in the aqueous phase were studied with home-made TiO2 photocatalyst powders synthesized by a thermo-hydrolysis approach that allowed a fine control of the crystallographic phase composition. Ammonia conversion and the selectivity toward mildly oxidized N2 and highly oxidized nitrite and nitrate anions were monitored during the runs. Pure brookite powders modified by Pt nanoparticles, deposited either from a colloidal suspension or by deposition–precipitation, were found to be the most efficient photocatalysts in NH3 degradation, with a desired good selectivity toward innocuous N2. The photo-activity in NH3 oxidation was correlated to the crystallographic features of the investigated TiO2-based materials, also taking into account the effects induced on the reaction paths by the presence of Pt nanoparticles on TiO2.
Graphical abstractThe photo-activity of Pt-modified pure brookite and its selectivity toward N2 were higher than those of Pt-modified samples mainly consisting of anatase (A) and rutile (R) and of anatase–rutile mixed phase P25.Figure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slide
