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Chemical Engineering Journal

Chemical Engineering Journal

IF: 13.3
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Densely embedded homogeneous FeOx nanoparticles in N-doped carbon frameworks: A 3D scaffold catalyst for high-temperature Fischer-Tropsch synthesis

Published:6 December 2024 DOI: 10.1016/j.cej.2024.158333
Mengmeng Xi, Yang Cheng, Fanhui Meng, Xuefang Yao, Muhammad Asif Nawaz, Maria Saif, Zhong Li, Tomas Ramirez Reina

Abstract

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.

Substances (6)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Chitosan 9012-76-4 C6H11NO4X2 1020 suppliers $13.00-$4250.00
Ethanol 64-17-5 C2H6O 954 suppliers $10.00-$41399.50
Formaldehyde 50-00-0 CH2O 902 suppliers $10.00-$1760.00
Resorcinol 108-46-3 C6H6O2 891 suppliers $7.62-$4205.00
Ammonia 7664-41-7 H3N 559 suppliers $15.00-$3688.65
Ferric nitrate 10421-48-4 FeN3O9 185 suppliers $23.30-$72.80

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