Photocatalytic production of hydrogen and methane from glycerol reforming over Pt/TiO2–Nb2O5
In this study, platinized mixed oxides (TiO<inf>2</inf>–Nb<inf>2</inf>O<inf>5</inf>) were tested on photocatalytic hydrogen production from a glycerol solution under UV light. Different samples with different Ti:Nb ratios were prepared by using a simple method tha...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/400775 |
| Acceso en línea: | http://hdl.handle.net/10261/400775 https://api.elsevier.com/content/abstract/scopus_id/85115922956 |
| Access Level: | acceso abierto |
| Palabra clave: | Ti:Nb weight ratio Glycerol Hydrogen Photocatalysis Pt–TiO2–Nb2O5 weight hydrogen glycerol |
| Sumario: | In this study, platinized mixed oxides (TiO<inf>2</inf>–Nb<inf>2</inf>O<inf>5</inf>) were tested on photocatalytic hydrogen production from a glycerol solution under UV light. Different samples with different Ti:Nb ratios were prepared by using a simple method that simultaneously combined a physical mixture and a platinum photochemical reduction. This method led to improved physicochemical properties such as low band gap, better Pt nanoparticle distribution on the surface, and the formation of different Pt species. Niobia content was also found to be an important factor in determining the overall efficiency of the Pt–TiO<inf>2</inf>–Nb<inf>2</inf>O<inf>5</inf> photocatalyst in the glycerol reforming reaction. The photocatalytic results showed that Pt on TiO<inf>2</inf>–Nb<inf>2</inf>O<inf>5</inf> enhanced hydrogen production from the aqueous glycerol solution at a 5 wt% initial glycerol concentration. The influence of different operating conditions such as the catalyst dosage and initial glycerol concentration was also evaluated. The results indicated that the best hydrogen and methane production was equal to 6657 μmol/L and 194 μmol/L, respectively after 4 h of UV radiation using Pt/Ti:Nb (1:2) sample and with 3 g/L of catalyst dosage. Moreover, the role of water in photocatalytic hydrogen production was studied through photocatalytic activity tests in the presence of D<inf>2</inf>O. The obtained results confirmed the role of water molecules on the photocatalytic production of hydrogen in an aqueous glycerol solution. |
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