Bulk Photodriven CO 2 Conversion through TiO 2 @Si(HIPE) Monolithic Macrocellular Foams - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Advanced Functional Materials Année : 2019

Bulk Photodriven CO 2 Conversion through TiO 2 @Si(HIPE) Monolithic Macrocellular Foams

Résumé

Operating photo‐induced reactions exclusively on catalyst surfaces while not exploiting the full catalyst volume generates a major footprint penalty for the photocatalytic reactor and leads to an inefficient use of the catalytic material. Photonic investigations clearly show that the solid foams have a strongly multidiffusive character, with photons being significantly trapped within the sample cores while addressing a photon mean free path lt = 20.1 ± 1.3 µm. This 3D process both greatly limits back‐reactions and promotes outstanding selectivity toward methane (around 80%) generation, and even ethane (around 18%) through C‐C coupling reaction, with residual carbon monoxide and dihydrogen contents (around 2%). Silica–titania TiO2@Si(HIPE) self‐standing macrocellular catalysts lead to optimal efficient thicknesses up to 20 times those of powders, thereby enhancing the way for real 3D‐photodriven catalytic processes above the millimeter scale and up to a 6 mm thickness. A rather simple Langmuir–Hinshelwood based kinetic model is proposed which highlights the strong dependence of photocatalytic reaction rates on light scattering and the crucial role on oxidation back‐reactions. In addition, a strong correlation between light attenuation coefficient and photon mean free path and median pore aperture diameter is demonstrated, offering thus a tool for photocatalytic behavior prediction.
Fichier principal
Vignette du fichier
Bulk photo.pdf (1.36 Mo) Télécharger le fichier
BulkSupplement.pdf (826.87 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02057166 , version 1 (14-06-2019)

Identifiants

Citer

Sophie Bernadet, Eugénie Tavernier, Duc-Minh Ta, Renaud Vallée, Serge Ravaine, et al.. Bulk Photodriven CO 2 Conversion through TiO 2 @Si(HIPE) Monolithic Macrocellular Foams. Advanced Functional Materials, 2019, 29 (9), pp.1807767. ⟨10.1002/adfm.201807767⟩. ⟨hal-02057166⟩

Collections

IFP CNRS INC-CNRS
92 Consultations
130 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More