Cobalt supported on carbon nanofibers- a promising novel Fischer-Tropsch catalyst

Bezemer, G. Leendert; Laak, Adri van; Dillen, A.J. van; Jong, Krijn P. de

doi:10.1016/s0167-2991(04)80061-2

Cited by 99 publications

(52 citation statements)

References 12 publications

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“…The catalyst precursor was reduced at 523 K in H 2 flow. Co/CNF (5 wt% Co) was prepared using a wet-impregnation method as described previously [31]. The catalyst precursor was reduced in a H 2 flow at 573 K.…”

Section: Preparation Of Palladium and Cobalt On Carbon Nanofibersmentioning

confidence: 99%

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

Winter

Bezemer

Spek

et al. 2005

Carbon

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In this paper, the presence of a considerable number of Co (3-4 nm) and Pd (1-4 nm) particles in the inner tube (4-9 nm inner diameter) of carbon nanofibers is demonstrated with TEM and XPS. Oxidation of freshly grown fibers in nitric acid resulted in opening of the inner tube of the fibers and in creating adsorption sites on the internal and external surface of the fibers needed for anchoring of the metal precursors. It is demonstrated that analysis with TEM tilt series is a very powerful tool to locate the actual position of the metal particles, i.e. on the external or internal surface of the fibers. The fraction of metal present in the inner core of the fibers varied from 10-15% for Pd to 28-34% for Co, depending on the synthesis method.

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Section: Preparation Of Palladium and Cobalt On Carbon Nanofibersmentioning

confidence: 99%

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

Winter

Bezemer

Spek

et al. 2005

Carbon

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“…In addition, we will limit ourselves to catalyst formulations composed of oxide supports, excluding the use of other interesting and promising support materials, such as, e.g., carbon nanofibers studied by the group of de Jong. 178,179 The paper starts with an introduction in F-T catalysis, including some recent developments in gas-to-liquid technologies and an overview of the main F-T catalyst compositions. In a second part, we will focus on the effect of promoter elements on Co-based F-T catalysis.…”

mentioning

confidence: 99%

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Morales¹,

Weckhuysen²

2006

ChemInform

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“…[25][26][27][28][29][30][31][32][33][34][35] In particular, Co clusters are one of the most important examples due to their magnetic properties [31][32][33][34][35][36] and their importance in the Fischer-Tropsch (FT) process. [37][38][39][40] Due to the high activity and long life time, 36 cobaltbased catalyst is currently the catalyst of choice for the conversion of syngas to liquid fuels in the FT process. Cobalt and cobalt-oxide nanoparticles on graphene can catalyze the oxygen reduction reaction nearly as well as platinum does and is substantially more durable.…”

Section: Introductionmentioning

confidence: 99%

Chemical Bonding and Electronic Properties of the Co Adatom and Dimer Interacting with Polyaromatic Hydrocarbons

2015

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The density functional calculations presented here elucidate the nature of the interaction between the Co atom and dimer with a polyaromatic hydrocarbon (PAH). The results are analyzed in terms of structural, electronic and magnetic properties. The bonding character of the Co atom and dimer adsorbed on the PAH exhibits a strong covalent bonding, arising from a hybridization between the d orbitals of Co and the p z orbitals of the carbon atoms, which cause an in-plane distortion in the PAHs. A small charge transfer takes place from the Co atom and dimer to the PAH surface, which creates a positive charge on the metal atoms and thereby change their catalytic activity. Upon adsorption, the magnetic moment of the Co adatom is reduced depending on the adsorption site. For the perpendicular Co dimer to the PAH plane, the projected magnetic moment of the Co atom further from the PAH is increased, which is due to antiferromagnetic coupling between the Co atoms in this configuration. Density of state analysis shows that the main contribution of magnetic moment reduction is due to promotion of electrons from the 4s states to the 3d states of the Co adatom upon adsorption.

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Cobalt supported on carbon nanofibers- a promising novel Fischer-Tropsch catalyst

Cited by 99 publications

References 12 publications

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

Chemical Bonding and Electronic Properties of the Co Adatom and Dimer Interacting with Polyaromatic Hydrocarbons

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