Low Metal Loading (Au, Ag, Pt, Pd) Photo-Catalysts Supported on TiO2 for Renewable Processes

Materials

Ilenia Rossetti¹  Francesco Conte¹  Gianguido Ramis²  Samar Hajjar-Garreau³  Cyril Vaulot³  Simona Bennici³ 

[1] Chemical Plants and Industrial Chemistry Group, INSTM Unit Milano-Università, Dip. Chimica, CNR-ISTM, Università degli Studi di Milano, via C. Golgi 19, 20133 Milan, Italy;INSTM Unit Genova, Dip. Ing. Chimica, Civile ed Ambientale, Università degli Studi di Genova, Via all’Opera Pia 15A, 16145 Genoa, Italy;Institut de Science des Materiaux, CNRS, IS2M UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, France;

关键词: photo-catalysis;    TiO₂;    CO₂ photo-reduction;    photo-reforming;    photo-reactor;   

DOI  :  10.3390/ma15082915

来源: DOAJ

【 摘 要 】

Photo-catalysts based on titanium dioxide, and modified with highly dispersed metallic nanoparticles of Au, Ag, Pd and Pt, either mono- or bi-metallic, have been analyzed by multiple characterization techniques, including XRD, XPS, SEM, EDX, UV-Vis and N₂ adsorption/desorption. Mono-metallic photo-catalysts were prepared by wet impregnation, while bi-metallic photocatalysts were obtained via deposition-precipitation (DP). The relationship between the physico-chemical properties and the catalyst’s behavior for various photo-synthetic processes, such as carbon dioxide photo-reduction to liquid products and glucose photo-reforming to hydrogen have been investigated. Among the tested materials, the catalysts containing platinum alone (i.e., 0.1 mol% Pt/TiO₂) or bi-metallic gold-containing materials (e.g., 1 wt% (Au_xAg_y)/TiO₂ and 1 wt% (Au_xPt_z)/TiO₂) showed the highest activity, presenting the best results in terms of productivity and conversion for both applications. The textural, structural and morphological properties of the different samples being very similar, the main parameters to improve performance were function of the metal as electron sink, together with optoelectronic properties. The high activity in both applications was related to the low band gap, that allows harvesting more energy from a polychromatic light source with respect to the bare TiO₂. Overall, high selectivity and productivity were achieved with respect to most literature data.

【 授权许可】

Unknown