Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction
In this work we focus on carbon nitride materials to improve the conversion and productivity of the photoreduction of CO<sub>2</sub>, developing a coupled strategy to optimize materials and operating conditions. The metal-free polymeric catalyst, graphitic carbon nitride (g-C<sub>3...
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MDPI AG
2022-12-01
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| Series: | Materials Proceedings |
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| author | Matteo Tommasi Francesco Conte Ilenia Rossetti Gianguido Ramis |
| author_facet | Matteo Tommasi Francesco Conte Ilenia Rossetti Gianguido Ramis |
| author_sort | Matteo Tommasi |
| collection | DOAJ |
| description | In this work we focus on carbon nitride materials to improve the conversion and productivity of the photoreduction of CO<sub>2</sub>, developing a coupled strategy to optimize materials and operating conditions. The metal-free polymeric catalyst, graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), is a relatively novel material, characterized by a wide absorbance in the visible region and demonstrating a superior performance compared to the commercial titania P25 benchmark, the most used photocatalyst for this application. We used an innovative photoreactor operating at high pressures of up to 20 bar, which is unprecedented in photocatalytic applications where transparent windows are needed. This enabled a boost in the solubility of CO<sub>2</sub> in water when operating the reactor as a tri-phase liquid/gas/solid device and improved the surface adsorption over the catalyst. The best productivity for HCOOH so far achieved with these catalysts at 8 bar, pH = 14 and by using Na<sub>2</sub>SO<sub>3</sub> as a hole scavenger was ca. 370 g/h kg<sub>cat</sub>. Such productivity is several orders of magnitude higher than the literature values. |
| format | Article |
| id | doaj-art-b57cbc56aae843d7a7be33f4e3b3bc3b |
| institution | Kabale University |
| issn | 2673-4605 |
| language | English |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials Proceedings |
| spelling | doaj-art-b57cbc56aae843d7a7be33f4e3b3bc3b2024-12-27T14:37:49ZengMDPI AGMaterials Proceedings2673-46052022-12-01111110.3390/materproc2022011001Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> PhotoreductionMatteo Tommasi0Francesco Conte1Ilenia Rossetti2Gianguido Ramis3Chemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano-Università, Via C. Golgi 19, 20133 Milan, ItalyChemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano-Università, Via C. Golgi 19, 20133 Milan, ItalyChemical Plants and Industrial Chemistry Group, Dipartimento Chimica, Università degli Studi di Milano, CNR-SCITEC and INSTM Unit Milano-Università, 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, ItalyIn this work we focus on carbon nitride materials to improve the conversion and productivity of the photoreduction of CO<sub>2</sub>, developing a coupled strategy to optimize materials and operating conditions. The metal-free polymeric catalyst, graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), is a relatively novel material, characterized by a wide absorbance in the visible region and demonstrating a superior performance compared to the commercial titania P25 benchmark, the most used photocatalyst for this application. We used an innovative photoreactor operating at high pressures of up to 20 bar, which is unprecedented in photocatalytic applications where transparent windows are needed. This enabled a boost in the solubility of CO<sub>2</sub> in water when operating the reactor as a tri-phase liquid/gas/solid device and improved the surface adsorption over the catalyst. The best productivity for HCOOH so far achieved with these catalysts at 8 bar, pH = 14 and by using Na<sub>2</sub>SO<sub>3</sub> as a hole scavenger was ca. 370 g/h kg<sub>cat</sub>. Such productivity is several orders of magnitude higher than the literature values.https://www.mdpi.com/2673-4605/11/1/1CO<sub>2</sub> photoreductionhigh pressure photoreactorphotocatalystscarbon nitridetitaniaultrasound exfoliation |
| spellingShingle | Matteo Tommasi Francesco Conte Ilenia Rossetti Gianguido Ramis Carbon Nitride-Based Catalysts for High Pressure CO<sub>2</sub> Photoreduction Materials Proceedings CO<sub>2</sub> photoreduction high pressure photoreactor photocatalysts carbon nitride titania ultrasound exfoliation |
| 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 high pressure photoreactor photocatalysts carbon nitride titania ultrasound exfoliation |
| url | https://www.mdpi.com/2673-4605/11/1/1 |
| work_keys_str_mv | AT matteotommasi carbonnitridebasedcatalystsforhighpressurecosub2subphotoreduction AT francescoconte carbonnitridebasedcatalystsforhighpressurecosub2subphotoreduction AT ileniarossetti carbonnitridebasedcatalystsforhighpressurecosub2subphotoreduction AT gianguidoramis carbonnitridebasedcatalystsforhighpressurecosub2subphotoreduction |