Bimetallic catalysts for the Fischer–Tropsch reaction

Calderone, V. Roberto; Shiju, N. Raveendran; Ferré, Daniel Curulla; Rothenberg, Gadi

doi:10.1039/c0gc00919a

Cited by 108 publications

(69 citation statements)

References 63 publications

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“…This could suggestt hat the alloy adoptsacore-shell-type structuret hat has ah igher Fe content in the shell. [13,14] The relative abundances of the Co-Fe alloy in the reduced bimetallic samples after in situ PXRD experiments were estimated using Rietveld refinement ( Table 2). The relative abundance of the alloy in the samples was noted to increasea st he Fe/Co ratio approached 5:5.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

“…Several studies have shown that bimetallic Fe-Co systems do not possessa dditive properties related to the constituent monometallic Fe or Co catalysts, but have unique characteristics. [5,[10][11][12][13] Tavasoli et al observed increased alcohol selectivity from bimetallic Fe-Co/carbon nanotubes (CNTs) catalystsc ompared to that of monometallic Co or Fe, which wasa ttributed to the formationo faC o-Fe alloy. [10] Duvenhage and Covillei nvestigated the effect of the metal precursor used to prepare supported bimetallic catalysts and compared metal nitrates with metal carbonyl complexes as precursors.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

et al. 2015

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Carbon spheres (CSs) synthesised by the hydrothermal approach were explored as a model support material for a bimetallic Fe–Co Fischer–Tropsch (FT) catalyst. The CSs were characterised by N2 adsorption–desorption, thermogravimetric analysis, FTIR spectroscopy and powder XRD. If annealed at 900 °C for 4 h, the CSs exhibited an improved surface area, thermal stability and crystallinity. A series of Fe–Co bimetallic FT catalysts supported on the annealed CSs were prepared by co‐precipitation. A variety of Fe‐to‐Co ratios were used with the total metal loadings maintained at 10 %. Catalyst reducibility studies were performed by H2 temperature‐programmed reduction and in situ powder XRD. Catalysts with a Fe/Co ratio of 5:5 (w/w) showed Co–Fe alloy formation upon reduction at >450 °C. Interestingly, the presence of this alloy did not correlate with high C5+ selectivities during FT synthesis; rather the Co‐rich/Fe‐poor catalyst gave the best selectivity. The CSs allowed the metal–metal interactions in the bimetallic systems to be monitored because of the weak interaction of the metals with the support.

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Section: Catalyst Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

et al. 2015

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“…[12][13][14] The promoting effect of adding a second element is often ascribed to effects related to surface structure (ensemble effects) or surface electronic properties (ligand effects). As elegantly described by Liu and Nørskov, [15] these effects can be explained in a quantitative manner by the following example.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

The influence of CO adsorption on the surface composition of cobalt/palladium alloys

et al. 2016

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Segregation induced by the adsorption of gas phase species can strongly influence the composition of bimetallic surfaces and can therefore play an important role in influencing heterogeneous catalytic reactions. The addition of palladium to cobalt catalysts has been shown to promote Fischer Tropsch catalysis. We investigate the adsorption of CO onto bimetallic CoPd surfaces on Pd{111} using a combination of reflection absorption infrared spectroscopy and medium energy ion scattering. The vibrational frequency of adsorbed CO provides crucial information on the adsorption sites adopted by CO and medium energy ion scattering probes the surface composition before and after CO exposure. We show that cobalt segregation is induced by CO adsorption and rationalise these observations in terms of the strength of adsorption of CO in various surface adsorption sites.

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“…Recent advances include synthesis of hybrid structures such as bimetallic nanoparticles and alloys. Interesting properties can arise in bimetallic structures through synergistic effects of their components (Baber et al 2010;Calderone et al 2011;Wang et al 2011). Bimetallic alloys such as Cu-Pd and Ag-Pd have been used as electrocatalysts for the oxygen reduction reaction and for hydrogen purification (Piper 1966;Milhano and Pletcher 2008;Tang et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

Sharma

Buchner

Scharmach³

et al. 2013

Aerosol Science and Technology

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We report production of bimetallic nanostructured coppersilver coatings by in situ deposition and sintering of metal nanoparticles produced as an aerosol. The metal nanoparticles themselves have potential applications in printed electronics, catalysis, antibacterial coatings, and heat transfer fluids. In many applications, nanoparticles are dispersed in an ink, which is then printed or coated onto a substrate and converted into a nanostructured thin film. Direct deposition from the aerosol allows us to produce nanostructured thin films without first dispersing the particles in a solvent. The high temperature reducing jet process allows formation of these metal nanoparticles from low-cost metal salt precursors in the gas phase. In this method, a fuel-rich hydrogen flame provides a low-cost source of energy to drive nanoparticle formation in a reducing environment. The aqueous precursor solution is delivered into the hot combustion product gases within a converging-diverging nozzle. The high-speed gas flow atomizes the precursor and provides exceptionally rapid mixing of the precursor with the hot gases. Here, particles are formed, then immediately quenched and deposited on a glass substrate. The effect of the silver content of the mixed copper-silver films on their electrical conductivity was studied systematically, revealing an abrupt transition from low conductivity to high conductivity between 30 wt.% and 40 wt.% silver.

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Bimetallic catalysts for the Fischer–Tropsch reaction

Cited by 108 publications

References 63 publications

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

Carbon Spheres Prepared by Hydrothermal Synthesis—A Support for Bimetallic Iron Cobalt Fischer–Tropsch Catalysts

The influence of CO adsorption on the surface composition of cobalt/palladium alloys

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

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