3D-Printed Fe-doped silicon carbide monolithic catalysts for wet peroxide oxidation processes
The catalyst stability has become a key issue for wet peroxide oxidation (CWPO) processes. Herein, an alternative method for the manufacturing of iron (Fe) catalysts by using three-dimensional (3D) printing techniques is proposed to enhance the Fe immobilization, where these metallic nanoparticles a...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/183154 |
| Acceso en línea: | http://hdl.handle.net/10261/183154 |
| Access Level: | acceso abierto |
| Palabra clave: | Catalytic wet peroxide oxidation Robocasting Silicon carbide Monolith 3D printing |
| Sumario: | The catalyst stability has become a key issue for wet peroxide oxidation (CWPO) processes. Herein, an alternative method for the manufacturing of iron (Fe) catalysts by using three-dimensional (3D) printing techniques is proposed to enhance the Fe immobilization, where these metallic nanoparticles are part of a printable aqueous silicon carbide (SiC)-based ink. Cylindrical Fe/SiC monoliths (D ∼ 13 mm, H ∼ 4.5 mm, 74 squared cells cm) are manufactured by direct ink writing (Robocasting) and further treatment up to 1500 °C into a spark plasma sintering (SPS) furnace to assure a certain mechanical integrity. It was found that the increasing SPS temperature progressively decreases the porosity -or increases the apparent density- of the printed struts, lowering the accessibility of reactants to the Fe sites but improving the catalyst mechanical strength and leaching resistance. 3D Fe/SiC monoliths treated at 1200 °C arise as robust catalysts for CWPO processes due to the combination of good catalytic activity, highly- efficient HO decomposition, long-term stability and excellent mechanical strength. A simple potential kinetic model is proposed, capable of describing the phenol disappearance, TOC removal and HO consumption. The results of this study point out a new approach for the conformation by Robocasting of metal-based catalysts in suitable morphological 3D-structures for scaling-up reactions. |
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