@article {659,
	title = {Bulk Photodriven CO2 Conversion through TiO2@Si(HIPE) Monolithic Macrocellular Foams},
	journal = {Advanced Functional Materials},
	volume = {3},
	year = {2019},
	month = {Jan-07-2019},
	pages = {1807767},
	abstract = {<p>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 <i>l</i><sub>t</sub> = 20.1 \&plusmn; 1.3 \&micro;m. 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\&ndash;titania TiO<sub>2</sub>@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\&ndash;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.</p>
},
	doi = {10.1002/adfm.201807767},
	url = {http://doi.wiley.com/10.1002/adfm.201807767},
	author = {Bernadet, Sophie and Tavernier, Eug{\'e}nie and Ta, Duc-Minh and Vall{\'e}e, Renaud A. L. and Ravaine, Serge and F{\'e}cant, Antoine and Backov, Renal}
}
