US 11,717,808 B2
Photocatalytic carbon dioxide reduction method using a photocatalyst in the form of a porous monolith
Sophie Bernadet, Merignac (FR); Antoine Fecant, Brignais (FR); Denis Uzio, Oullins (FR); Renal-Vasco Backov, Bordeaux (FR); and Serge Ravaine, Cestas (FR)
Assigned to IFP Energies nouvelles, Rueil-Malmaison (FR)
Appl. No. 16/608,568
Filed by IFP Energies nouvelles, Rueil-Malmaison (FR)
PCT Filed Apr. 23, 2018, PCT No. PCT/EP2018/060380
§ 371(c)(1), (2) Date Oct. 25, 2019,
PCT Pub. No. WO2018/197435, PCT Pub. Date Nov. 1, 2018.
Claims priority of application No. 1753758 (FR), filed on Apr. 28, 2017.
Prior Publication US 2021/0106977 A1, Apr. 15, 2021
Int. Cl. B01J 23/10 (2006.01); B01D 53/00 (2006.01); B01D 53/86 (2006.01); B01J 21/06 (2006.01); B01J 21/08 (2006.01); B01J 35/00 (2006.01); B01J 35/04 (2006.01); B01J 35/10 (2006.01)
CPC B01J 23/10 (2013.01) [B01D 53/007 (2013.01); B01D 53/8671 (2013.01); B01J 21/063 (2013.01); B01J 21/08 (2013.01); B01J 35/004 (2013.01); B01J 35/0026 (2013.01); B01J 35/0033 (2013.01); B01J 35/04 (2013.01); B01J 35/1014 (2013.01); B01J 35/1019 (2013.01); B01J 35/1023 (2013.01); B01J 35/1038 (2013.01); B01J 35/1042 (2013.01); B01J 35/1047 (2013.01); B01J 35/1057 (2013.01); B01J 35/1061 (2013.01); B01J 35/1066 (2013.01); B01J 35/1071 (2013.01); B01J 35/1076 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/20707 (2013.01); B01D 2255/30 (2013.01); B01D 2255/802 (2013.01); B01D 2255/9202 (2013.01); B01D 2255/9205 (2013.01); B01D 2255/9207 (2013.01); B01D 2257/504 (2013.01); B01D 2259/804 (2013.01)] 11 Claims
 
1. A photocatalytic carbon dioxide reduction process carried out in the liquid phase and/or in the gas phase under irradiation using a photocatalyst in the form of a porous monolith containing at least one semiconductor, which process comprises the following steps:
a) a feedstock containing carbon dioxide and at least one sacrificial compound is brought into contact with the photocatalyst which is in the form of a porous monolith comprising a bulk density of less than or equal to 0.25 g/ml;
b) the photocatalyst is irradiated with at least one irradiation source producing at least one wavelength lower than the bandgap of said photocatalyst, said step b) being carried out at a temperature of between −10° C. and 200° C., and at a pressure of between 0.01 MPa and 70 MPa,
wherein the photocatalyst in the form of a porous monolith has a mesoporous volume, of which the pore diameter is greater than 0.2 nm and less than or equal to 50 nm, of between 0.01 and 1 ml/g,
wherein the photocatalyst in the form of a porous monolith has a type-I macroporous volume, of which the pore diameter is greater than 50 nm and less than or equal to 1000 nm, of between 0.1 and 3 ml/g, and
wherein the photocatalyst in the form of a porous monolith has a type-II macroporous volume, of which the pore diameter is greater than 1 μm and less than or equal to 10 μm, of between 0.1 and 8 ml/g.