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Article

Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors

1
Department of Mechanical Engineering, UTSA, One UTSA Circle, San Antonio, TX 78249, USA
2
Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, USA
3
Department of Biomedical Engineering and Chemical Engineering, UTSA, One UTSA Circle, San Antonio, TX 78249, USA
4
Argonne National Laboratory, Argonne, IL 60439, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Ajay K. Dalai and Dmitry Yu. Murzin
Reactions 2021, 2(2), 129-160; https://doi.org/10.3390/reactions2020011
Received: 20 April 2021 / Revised: 26 May 2021 / Accepted: 27 May 2021 / Published: 1 June 2021
(This article belongs to the Special Issue Catalytic Conversion of Carbonaceous Materials to Fuels and Chemicals)
Different low-cost cobalt precursors (acetate, chloride) and thermal treatments (air calcination/H2 reduction versus direct H2-activation) were investigated to alter the interaction between cobalt and silica. H2-activated catalysts prepared from cobalt chloride had large Co0 particles (XRD, chemisorption) formed by weak interactions between cobalt chloride and silica (temperature programmed reduction (TPR), TPR with mass spectrometry (TPR-MS), TPR with extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge spectroscopy (XANES) techniques) and retained Cl-blocked active sites, resulting in poor activity. In contrast, unpromoted Co/SiO2 catalysts derived from cobalt acetate had strong interactions between Co species and silica (TPR/TPR-MS, TPR-EXAFS/XANES); adding Pt increased the extent of the Co reduction. For these Pt-promoted catalysts, the reduction of uncalcined catalysts was faster, resulting in larger Co0 clusters (19.5 nm) in comparison with the air-calcined/H2-activated catalyst (7.8 nm). Both catalysts had CO conversions 25% higher than that of the Pt-promoted catalyst prepared in the traditional manner (air calcination/H2 reduction using cobalt nitrate) and three times higher than that of the traditional unpromoted Co/silica catalyst. The retention of residual cobalt carbide (observed in XANES) from cobalt acetate decomposition impacted performance, resulting in a higher C1–C4 selectivity (32.2% for air-calcined and 38.7% for uncalcined) than that of traditional catalysts (17.5–18.6%). The residual carbide also lowered the α-value and olefin/paraffin ratio. Future work will focus on improving selectivity through oxidation–reduction cycles. View Full-Text
Keywords: Fischer-Tropsch synthesis; cobalt; silica; cobalt acetate; cobalt chloride; platinum; promoters; direct reduction; TPR-XANES; TPR-EXAFS; TPR-MS Fischer-Tropsch synthesis; cobalt; silica; cobalt acetate; cobalt chloride; platinum; promoters; direct reduction; TPR-XANES; TPR-EXAFS; TPR-MS
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MDPI and ACS Style

Mehrbod, M.; Martinelli, M.; Watson, C.D.; Cronauer, D.C.; Kropf, A.J.; Jacobs, G. Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors. Reactions 2021, 2, 129-160. https://doi.org/10.3390/reactions2020011

AMA Style

Mehrbod M, Martinelli M, Watson CD, Cronauer DC, Kropf AJ, Jacobs G. Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors. Reactions. 2021; 2(2):129-160. https://doi.org/10.3390/reactions2020011

Chicago/Turabian Style

Mehrbod, Mohammad, Michela Martinelli, Caleb D. Watson, Donald C. Cronauer, A. J. Kropf, and Gary Jacobs. 2021. "Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors" Reactions 2, no. 2: 129-160. https://doi.org/10.3390/reactions2020011

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