Densely embedded homogeneous FeO<inf>x</inf> nanoparticles in N-doped carbon frameworks: A 3D scaffold catalyst for high-temperature Fischer-Tropsch synthesis
Fe-based catalysts show great promise in advancing the application of high-temperature Fischer-Tropsch synthesis (HT-FTS) for producing value-added chemicals and liquid fuels; however, maintaining high catalytic activity and stability at elevated temperatures remains a significant challenge. Here, a...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/381511 |
| Acceso en línea: | http://hdl.handle.net/10261/381511 https://api.elsevier.com/content/abstract/scopus_id/85211253530 |
| Access Level: | acceso embargado |
| Palabra clave: | 3D structure Carbon encapsulation Chitosan Fischer-Tropsch synthesis Iron-based catalyst N-doping http://metadata.un.org/sdg/7 http://metadata.un.org/sdg/13 Ensure access to affordable, reliable, sustainable and modern energy for all Take urgent action to combat climate change and its impacts |
| Sumario: | Fe-based catalysts show great promise in advancing the application of high-temperature Fischer-Tropsch synthesis (HT-FTS) for producing value-added chemicals and liquid fuels; however, maintaining high catalytic activity and stability at elevated temperatures remains a significant challenge. Here, a novel approach was employed to prepare carbon sphere (CS)-supported Fe catalysts, where isolated Fe particles are efficiently embedded within a carbon matrix to enhance both catalytic activity and stability. The resulting 3D scaffold structure catalyst featuring ultrafine FeOx nanoparticles (NPs) dispersed within nitrogen-doped carbon frameworks was synthesized from Fe-chitosan/CS composites using a chelate-assisted impregnation method paired with unidirectional freeze treatment. The coordination between chitosan chains and Fe(Ⅲ) has yielded a homogeneous Fe-chitosan composite, with the embedded FeOx NPs within the nitrogen-doped carbon (NC) matrix serving as pivotal barriers against sintering, thus enhancing stability. The synergistic effect of adding K promoter and the resulting 3D scaffold structure in Fe-K@NC/CS catalyst has further fine-tuned catalytic activity, ensuring high stability in HT-FTS. The current strategy of fabricating N-doped 3D scaffold structures of hybrid carbonaceous material achieved unprecedented results, with the CO conversion reached 62.7 % and C2-C4= olefin selectivity of 29.0 % at 340 °C, 20 bar and space velocity of 48000 mL gcat–1h−1. |
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