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.
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