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

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dc.contributor.authorMehrbod, Mohammad
dc.contributor.authorMartinelli, Michela
dc.contributor.authorWatson, Caleb D.
dc.contributor.authorCronauer, Donald C.
dc.contributor.authorKropf, A. Jeremy
dc.contributor.authorJacobs, Gary
dc.date.accessioned2021-06-24T14:10:38Z
dc.date.available2021-06-24T14:10:38Z
dc.date.issued2021-06-01
dc.date.updated2021-06-24T14:10:40Z
dc.description.abstractDifferent 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.
dc.description.departmentMechanical Engineering
dc.description.departmentBiomedical Engineering and Chemical Engineering
dc.identifierdoi: 10.3390/reactions2020011
dc.identifier.citationReactions 2 (2): 129-160 (2021)
dc.identifier.urihttps://hdl.handle.net/20.500.12588/622
dc.rightsAttribution 4.0 United States
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectFischer-Tropsch synthesis
dc.subjectcobalt
dc.subjectsilica
dc.subjectcobalt acetate
dc.subjectcobalt chloride
dc.subjectplatinum
dc.subjectpromoters
dc.subjectdirect reduction
dc.subjectTPR-XANES
dc.subjectTPR-EXAFS
dc.subjectTPR-MS
dc.titleFischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors
dc.typeArticle

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