Preparation and photocatalytic activity of Au/TiO2 lyogels for hydrogen production
| Autor: | Jordi Llorca, Ignasi Mata, Mónica Benito, Lluís Soler, Lester Martínez, Elies Molins |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia |
| Rok vydání: | 2018 |
| Předmět: |
Anatase
Materials science Hydrogen education Fotocatàlisi Energy Engineering and Power Technology Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Enginyeria química [Àrees temàtiques de la UPC] law Calcination Photocatalysis Hydrogen production Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology 0104 chemical sciences Fuel Technology chemistry Chemical engineering Rutile 0210 nano-technology Space velocity |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 2398-4902 |
| DOI: | 10.1039/c8se00293b |
| Popis: | High surface area titania lyogels have been prepared, thermally transformed into TiO2 polymorphs at 400–850 °C, and decorated by ball milling with preformed Au nanoparticles of ca. 2 nm to ensure the same contact points at the metal–support interphase. The best performance in the photogeneration of hydrogen from gaseous water–ethanol under dynamic conditions in a fixed bed reactor has been obtained with the lyogel calcined at 550 °C, with a hydrogen photoproduction rate of 19.8 mmol H2 g−1 h−1 under an irradiance of 80 mW cm−2 and GHSV = 26 000 h−1. This photocatalyst contains 84% anatase and 16% rutile polymorphs, very similar to the standard P25. A series of photocatalysts prepared by lyophilization of a mixture of the titania gel and the preformed Au nanoparticles and calcination under the same conditions has resulted in samples with Au nanoparticles up to 18 nm strongly interacting with TiO2. The presence of Au nanoparticles in the composite lyogel has strongly retarded the transformation of anatase into rutile. The results have shown that the TiO2 polymorph has a greater influence than the Au nanoparticle size on the photoproduction of hydrogen. |
| Databáze: | OpenAIRE |
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