Ruthenium nanoparticles encapsulated inside porous hollow carbon spheres: A novel catalyst for Fischer–Tropsch synthesis

Coville, Neil J.; Kumi, David O.; Dlamini, Mbongiseni W.; Jewell, Linda L.

doi:10.1016/j.cattod.2015.11.034

Cited by 35 publications

(21 citation statements)

References 61 publications

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“…This microporosity was also confirmed by the pore size distribution plots, which showed significant nitrogen adsorption at average pore diameters of < 2 nm. Ideally, mesopores are the preferred pores because they allow for an easier diffusion as the high porosity allows for the easy diffusion of reactants and products both into and out of the hollow carbon sphere cavity [11,36].…”

Section: Carbon Shell Porositymentioning

confidence: 99%

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Coville

Dlamini

Kumi

et al. 2020

Applied Catalysis A: General

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Hollow carbon spheres (HCS) containing Co nanoparticles placed inside the HCS were synthesized for the first time using polystyrene spheres as a template. The encapsulated Co nanoparticles, after reduction, showed Fischer-Tropsch (FT) activity indicating syngas accessibility through the HCS porous shell. Two Co catalysts promoted by Ru, placed either inside or outside the HCS (CoRu@HCS and Co@HCS@Ru), were also synthesized andThe location of the Co and Ru was confirmed by SEM and TEM analyses. Insitu XRD studies indicated enhanced H2 reduction of the Co oxide to Co, inside the HCS, in the order CoRu@HCS >Co@HCS@Ru > Co@HCS. The CoRu@HCS catalyst had the highest FT activity, and this was ascribed to a primary spillover effect associated with the direct contact of the Co and Ru inside the HCS. A small secondary spillover effect was also noted for Co@HCS@Ru.

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Section: Carbon Shell Porositymentioning

confidence: 99%

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Coville

Dlamini

Kumi

et al. 2020

Applied Catalysis A: General

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“…41,42 In addition, HCSs are lightweight and cheap and their void centre presents numerous strategies for lling with metals or chemicals to further modify their properties. [43][44][45][46] Therefore, HCSs with their size-dependent properties have become attractive nanomaterials with versatile applications in catalysis, [43][44][45][46] fuel cells, 47 supercapacitors 48 and lithium ion batteries. 49 In this study, we have examined the response of three different sensors based on HCSs (as-synthesized, annealed, and in a PVP composite) to ammonia vapours while varying the relative humidity (RH).…”

Section: Introductionmentioning

confidence: 99%

Hollow carbon spheres and a hollow carbon sphere/polyvinylpyrrolidone composite as ammonia sensors

et al. 2017

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“…[12][13][14] Hollow carbon spheres (HCSs) are particularly interesting because of their porous structure, high surface area and low densities. [15,16] The low densities of HCSs coupled with their high surface to volume ratios make them ideal support materials for the synthesis of highly dispersed catalysts. Additionally, the relatively inert carbon framework provides an ideal platform for studies on metal-support interactions, catalyst size eff ects and the influence of surface functionalization.…”

Section: Introductionmentioning

confidence: 99%

Post doped nitrogen-decorated hollow carbon spheres as a support for Co Fischer-Tropsch catalysts

et al. 2020

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In this study the outer surface of porous hollow carbon spheres (HCSs) materials were functionalized by N-doping using a post-synthesis method and they were used as a Fischer-Tropsch catalyst support. Melamine was used as the nitrogen source, and carbonization was performed at diff erent temperatures (600 and 900 °C) to introduce variable levels of N into the HCSs, with diff erent bonding configurations. This procedure allowed for the incorporation of up to 13% N. Our results show that post-synthesis N-doping introduced marginal defects into the carbon framework and this did not aff ect the thermal stability of the materials. XPS studies revealed that the surface content on these materials varied and provided evidence for temperaturetunable bonding configurations. Eff ects associated with post-synthesis N-doping were apparent on the Co catalyst (˜10 wt.%) properties such as the inhibited reduction caused by a metal-support interaction observed by the H2-TPR and in situ PXRD techniques. As a consequence the Fischer-Tropsch performance was influenced as both the activity and stability were improved on the catalysts supported on the N-doped materials. TEM analysis of the spent catalysts demonstrated the influence of N-doping on the sintering characteristics of Co, with particles > 30 nm measured on the N-free catalyst while Ndoped samples had sizes < 15 nm.

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Ruthenium nanoparticles encapsulated inside porous hollow carbon spheres: A novel catalyst for Fischer–Tropsch synthesis

Cited by 35 publications

References 61 publications

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Co inside hollow carbon spheres as a Fischer-Tropsch catalyst: Spillover effects from Ru placed inside and outside the HCS

Hollow carbon spheres and a hollow carbon sphere/polyvinylpyrrolidone composite as ammonia sensors

Post doped nitrogen-decorated hollow carbon spheres as a support for Co Fischer-Tropsch catalysts

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