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Research Article

Design and construction of size-controlled CoO/CS catalysts for Fischer–Tropsch synthesis

Wei Sun1,§, Ting Kuang1,§, Guiyou Wei1, Yue Li1, Yaqin Liu1, Shuai Lyu2, Yuhua Zhang1, Jinlin Li1, Li Wang1( )
Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan 430074, China
Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China

§ Wei Sun and Ting Kuang contributed equally to this work.

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Graphical Abstract

The influence of face-centered cubic (fcc)-Co particle size has been studied experimentally, revealing that the turnover frequency (TOF) remained unaffected by cobalt particle size larger than 7.7 nm. Significantly, when reducing the size of metallic fcc-Co0 particles from 17.6 to 7.7 nm, the cobalt time yield increased to 6.7 μmolCO·gCo−1·s−1, indicating an enhancement in catalytic activity.

Abstract

The use of supported Co-based catalysts is widespread in various catalytic reactions due to their unique structures. The structural sensitivity of these catalysts is closely linked to their particle size and crystal form. Consequently, comprehending the structure–activity relationship requires the development of well-defined Co-based catalysts. Herein, we employed a colloidal wet chemical process and a heterogeneous nucleation method to prepare well-defined Co-based catalysts supported by inert carbon nanospheres. The nanospheres’ surface possesses abundant functional groups that efficiently capture metal complexes and facilitate the nucleation and growth of CoO nanoparticles. By adjusting the Co source concentration, solvent molar ratio, and nucleation growth kinetics, we successfully prepared CoO/carbon sphere (CS) catalysts with different particle sizes and crystal forms. The influence of metallic face-centered cubic (fcc)-Co0 particle size in the range of 6.6–17.6 nm on the performance of Fischer–Tropsch synthesis (FTS) using well-defined CoO/CS catalysts has been investigated. The result demonstrated that the turnover frequency (TOF) remained constant for CoO/CS catalysts with metallic fcc-Co0 particle size larger than 7.7 nm. However, both the selectivity and the activity changed for CoO/CS catalysts with smaller particles (< 7.7 nm). Significantly, when metallic fcc-Co0 particle size was reduced from 17.6 to 7.7 nm, the cobalt time yield increased to 6.7 μmolCO·gCo−1·s−1, indicating improved catalytic activity. At the same time, the CH4 selectivity decreased to 4.9%, suggesting a higher preference for hydrocarbon production. These findings demonstrate the importance of particle size in Co catalyzed Fischer–Tropsch synthesis. The use of well-defined CoO/CS catalysts offers valuable insights into the structure–activity relationship, leading to a better understanding of Co catalyzed Fischer–Tropsch synthesis.

Keywords

Fischer–Tropsch synthesis (FTS)cobaltsize effectsphase effectscarbon nanospheres

Electronic Supplementary Material

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Nano Research
Volume 17 Issue 4,
April 2024
Pages 2520-2527
DOI: 10.1007/s12274-023-6199-4
Cite this article:
Sun W, Kuang T, Wei G, et al. Design and construction of size-controlled CoO/CS catalysts for Fischer–Tropsch synthesis. Nano Research, 2024, 17(4): 2520-2527. https://doi.org/10.1007/s12274-023-6199-4
Topics:
Catalyst activityMetal nanoparticles

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Received: 29 August 2023
Revised: 12 September 2023
Accepted: 12 September 2023
Published: 17 November 2023
© Tsinghua University Press 2023
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