The Preparation and Characterization of Co–Ni Nanoparticles and the Testing of a Heterogenized Co–Ni/Alumina Catalyst for CO Hydrogenation

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dc.contributor.authorLópez-Tinoco, Julián
dc.contributor.authorMendoza-Cruz, Rubén
dc.contributor.authorBazán-Díaz, Lourdes
dc.contributor.authorKaruturi, Sai Charan
dc.contributor.authorMartinelli, Michela
dc.contributor.authorCronauer, Donald C.
dc.contributor.authorKropf, A. Jeremy
dc.contributor.authorMarshall, Christopher L.
dc.contributor.authorJacobs, Gary
dc.date.accessioned2021-04-19T15:17:56Z
dc.date.available2021-04-19T15:17:56Z
dc.date.issued2019-12-21
dc.date.updated2021-04-19T15:17:57Z
dc.description.abstractSamples of well-controlled nanoparticles consisting of alloys of cobalt and nickel of different atomic ratios were synthesized using wet chemical methods with oleylamine as the solvent and the reducing agent. These materials were characterized by a variety of techniques, including high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Small amounts of heterogenized catalysts were prepared using alumina as the support. However, the potential for use of Co–Ni catalysts in CO hydrogenation was explored using a larger amount of Co–Ni/alumina catalyst prepared from standard aqueous impregnation methods and tested in a continuously stirred tank reactor (CSTR) for Fischer–Tropsch synthesis (FTS). Results are compared to a reference catalyst containing only cobalt. The heterogenized catalysts were characterized using synchrotron methods, including temperature programmed reduction with extended X-ray absorption fine structure spectroscopy and X-ray absorption near edge spectroscopy (TPR-EXAFS/XANES). The characterization results support intimate contact between Co and Ni, strongly suggesting alloy formation. In FTS testing, drawbacks of Ni addition included decreased CO conversion on a per gram catalyst basis, although Ni did not significantly impact the turnover number of cobalt, and produced slightly higher light gas selectivity. Benefits of Ni addition included an inverted induction period relative to undoped Co/Al2O3, where CO conversion increased with time on-stream in the initial period, and the stabilization of cobalt nanoparticles at a lower weight % of Co.
dc.description.departmentPhysics and Astronomy
dc.description.departmentMechanical Engineering
dc.description.departmentBiomedical Engineering and Chemical Engineering
dc.identifierdoi: 10.3390/catal10010018
dc.identifier.citationCatalysts 10 (1): 18 (2020)
dc.identifier.urihttps://hdl.handle.net/20.500.12588/470
dc.rightsAttribution 4.0 United States
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectcobalt–nickel nanoparticles
dc.subjectcobalt–nickel alloys
dc.subjectcobalt
dc.subjectnickel
dc.subjectalumina
dc.subjectHAADF-STEM
dc.subjectTPR-EXAFS/XANES
dc.subjectFischer-Tropsch synthesis
dc.subjectCO hydrogenation
dc.subjectCSTR
dc.titleThe Preparation and Characterization of Co–Ni Nanoparticles and the Testing of a Heterogenized Co–Ni/Alumina Catalyst for CO Hydrogenation
dc.typeArticle

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