Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction
In the current research, the productivity of CO<sub>2</sub> photoreduction has been boosted by performing the reaction in an innovative photocatalytic reactor, which allows for operation up to 20 bar. A set of photocatalysts were used, including three types of pristine TiO<sub>2<...
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MDPI AG
2022-12-01
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| author | Francesco Conte Elisa I. García-López Giuseppe Marcì Claudia L. M. Bianchi Gianguido Ramis Ilenia Rossetti |
| author_facet | Francesco Conte Elisa I. García-López Giuseppe Marcì Claudia L. M. Bianchi Gianguido Ramis Ilenia Rossetti |
| author_sort | Francesco Conte |
| collection | DOAJ |
| description | In the current research, the productivity of CO<sub>2</sub> photoreduction has been boosted by performing the reaction in an innovative photocatalytic reactor, which allows for operation up to 20 bar. A set of photocatalysts were used, including three types of pristine TiO<sub>2</sub>, i.e., one commercially prepared (Evonik P25), one home-prepared by flame spray pyrolysis (FSP), and one obtained by the hydrolysis of TiCl<sub>4</sub> (TiO<sub>2</sub>exCl), a bare thermo-exfoliated carbon nitride (C<sub>3</sub>N<sub>4</sub>-TE), and binary materials composed of TiO<sub>2</sub> and C<sub>3</sub>N<sub>4</sub>-TE. The photoreduction was carried out in water at pH 14 and in the presence of Na<sub>2</sub>SO<sub>3</sub> as a hole scavenger. Hydrogen and very small amounts of CO were detected in the head space of the photoreactor, while in the liquid phase, the main product was formic acid, along with traces of methanol and formaldehyde. The composites P25/TE and TiO<sub>2</sub>exCl/TE were found to have a higher productivity if compared to its single constituents used alone, probably due to the heterojunction formed by coupling the two materials. Moreover, the high pressure applied in the photoreactor proved to be very effective in boosting the yield of the organic products. |
| first_indexed | 2024-03-09T17:13:23Z |
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| last_indexed | 2024-03-09T17:13:23Z |
| publishDate | 2022-12-01 |
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| series | Catalysts |
| spelling | doaj.art-711d3df39b604c4eaef5b74dfbc14c822023-11-24T13:52:18ZengMDPI AGCatalysts2073-43442022-12-011212162810.3390/catal12121628Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> PhotoreductionFrancesco Conte0Elisa I. García-López1Giuseppe Marcì2Claudia L. M. Bianchi3Gianguido Ramis4Ilenia Rossetti5Chemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano Via C. Golgi 19, 20133 Milan, ItalyDepartment of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy“Schiavello-Grillone” Photocatalysis Group, Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, 90128 Palermo, ItalyChemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano Via C. Golgi 19, 20133 Milan, ItalyDipartimento Ingegneria Chimica, Civile ed Ambientale, Università degli Studi di Genova and INSTM Unit Genova, Via all’Opera Pia 15A, 16145 Genoa, ItalyChemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano Via C. Golgi 19, 20133 Milan, ItalyIn the current research, the productivity of CO<sub>2</sub> photoreduction has been boosted by performing the reaction in an innovative photocatalytic reactor, which allows for operation up to 20 bar. A set of photocatalysts were used, including three types of pristine TiO<sub>2</sub>, i.e., one commercially prepared (Evonik P25), one home-prepared by flame spray pyrolysis (FSP), and one obtained by the hydrolysis of TiCl<sub>4</sub> (TiO<sub>2</sub>exCl), a bare thermo-exfoliated carbon nitride (C<sub>3</sub>N<sub>4</sub>-TE), and binary materials composed of TiO<sub>2</sub> and C<sub>3</sub>N<sub>4</sub>-TE. The photoreduction was carried out in water at pH 14 and in the presence of Na<sub>2</sub>SO<sub>3</sub> as a hole scavenger. Hydrogen and very small amounts of CO were detected in the head space of the photoreactor, while in the liquid phase, the main product was formic acid, along with traces of methanol and formaldehyde. The composites P25/TE and TiO<sub>2</sub>exCl/TE were found to have a higher productivity if compared to its single constituents used alone, probably due to the heterojunction formed by coupling the two materials. Moreover, the high pressure applied in the photoreactor proved to be very effective in boosting the yield of the organic products.https://www.mdpi.com/2073-4344/12/12/1628CO<sub>2</sub> photoreductioncarbon capture and conversionphotocatalysispressurized photoreactortitanium dioxidecarbon nitride |
| spellingShingle | Francesco Conte Elisa I. García-López Giuseppe Marcì Claudia L. M. Bianchi Gianguido Ramis Ilenia Rossetti Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction Catalysts CO<sub>2</sub> photoreduction carbon capture and conversion photocatalysis pressurized photoreactor titanium dioxide carbon nitride |
| title | Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction |
| title_full | Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction |
| title_fullStr | Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction |
| title_full_unstemmed | Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction |
| title_short | Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction |
| title_sort | carbon nitride based catalysts for high pressure co sub 2 sub photoreduction |
| topic | CO<sub>2</sub> photoreduction carbon capture and conversion photocatalysis pressurized photoreactor titanium dioxide carbon nitride |
| url | https://www.mdpi.com/2073-4344/12/12/1628 |
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