Enhancement of activity, selectivity and stability of CNTs-supported cobalt catalyst in Fischer–Tropsch via CNTs functionalization

Davari, Maryam; Karimi, Saeed; Tavasoli, Ahmad; Karimi, Ali

doi:10.1016/j.apcata.2014.07.023

Cited by 56 publications

(36 citation statements)

References 41 publications

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“…Some catalytic properties of metal/CNTs catalysts are well predicted by applying the concept of the confinement energy ( Figure 12). 66 Besides Fe/CNTs, other CNTs supported group VIII base metal catalysts, including Co/CNTs, 202 Ni/CNTs, 80,203 FeCo/CNTs, 204 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 multiwalled CNTs (Co-in-MWCNTs and Co-out-CNTs) to discover the relationship between the F-T synthesis catalytic performance and the location of cobalt. 85 It was found that the selectivity of C 5+ products was mainly determined by the activation temperature and the surface chemistry of Co NPs.…”

Section: Confinement Effectmentioning

confidence: 99%

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

et al. 2015

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Inexpensive group VIII metal (i.e., Fe, Co, and Ni)-based solid catalysts have been widely used in various energy transformation processes such as Fisher-Tropsch (F-T) synthesis, reforming and water-gas shift reactions. The emerging encapsulation strategy, which represents active metal species are coated by protective shell or matrix, has been demonstrated as a powerful means to promote the catalytic performance (i.e., activity, stability and selectivity) of Fe-, Co-and Ni-based catalysts due to synergic effects from the well-defined structures. This review describes recent progress on the design and synthesis of encapsulated group VIII base-metal nanomaterials developed for energy and environmental catalysis including syngas conversion, CO 2 dry reforming, steam reforming, methane conversion and NH 3 decomposition. We start with an introduction of the catalysts with different encapsulating structures (e.g., core@shell, yolk@shell, core@tube, mesoporous structures and lamellar structures). Then, the synthetic methods of Fe-, Co-and Ni-based catalysts with encapsulated structures are described in detail. The functions of encapsulation structures in catalysis, including protecting metal nanoparticles (NPs) from sintering, promoting the activity due to the confinement effect and intensifying reaction processes in the form of multifunctional catalysts, are discussed respectively. Our perspectives regarding the challenges and opportunities for future research in the field are also provided.

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Section: Confinement Effectmentioning

confidence: 99%

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

et al. 2015

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“…Ni also displays an excellent ability for C‐C coupling reaction in the step of C 1 to C 2 for formation of higher alcohols as well as high activity after sulphur treatment . MWCNT is a novel catalyst support due to its nano‐sized channels, high mechanical strength, and high thermal conductivity . MWCNT also showed excellent performance in adsorption‐activation of hydrogen, and promoting spillover of adsorbed H‐species …”

Section: Introductionmentioning

confidence: 99%

“…MWCNT is a novel catalyst support due to its nano‐sized channels, high mechanical strength, and high thermal conductivity . MWCNT also showed excellent performance in adsorption‐activation of hydrogen, and promoting spillover of adsorbed H‐species …”

Section: Introductionmentioning

confidence: 99%

Effects of particle size on the catalytic performance of MWCNTs supported alkalized MoS₂ catalysts promoted by Ni and Co in higher alcohols synthesis

Tavasoli

Kiai

Karimi³

2016

Can J Chem Eng

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A series of nano‐sized alkalized MoS2 catalysts promoted by Ni and Co supported on multi‐walled carbon nanotubes (MWCNTs) were prepared via the reverse microemulsion technique with water to surfactant (W/S) molar ratios (molwater · mol−1surfactant) of 1–12. All prepared catalysts were extensively characterized by ICP, BET, CO chemisorption, XRD, TPR, and TEM techniques. They were assessed in a fixed‐bed micro‐reactor to find their performance in higher alcohol synthesis from syngas. The results were compared with those of the catalyst prepared by the incipient wetness impregnation method with similar elemental composition. The results showed the relationship of catalyst physicochemical properties and performances to preparation method and average metal particle sizes. Calculated average particle sizes for prepared catalysts via microemulsion showed a decreasing trend with a decrease in W/S ratio. It decreased from 17.4 to 5.26 nm for W/S ratios of 12 to 1, respectively. Similarly, the average particle size for prepared catalysts with the impregnation method was 18.78 nm. The nano‐catalyst prepared via microemulsion with W/S of 1 showed the best performance for CO conversion and higher alcohol selectivity of 66.83 and 37.76, respectively. It was concluded that decreased particle sizes increased the active surface area of the Ni and Co promoted alkalized MoS2/MWCNTs catalysts and increased the fraction of metal particles located inside the CNTs, which in turn improved the catalyst performance.

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“…The higher temperature of the Pt 4+ -to-Pt 0 reduction indicates the relatively poor dispersion of metal salt precursors. Pt 4+ confined inside CNTs can be easily reduced because of the confinement [16,17,33] and hydrogen spill-over functional groups [34]. This phenomenon can also be explained by electronic effects.…”

Section: Resultsmentioning

confidence: 86%

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Cao

Zhu

et al. 2017

Catalysts

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Carbon nanotubes (CNTs)-supported Pt nanoparticles were prepared with selective deposition of Pt nanoparticles inside and outside CNTs (Pt-in/CNTs and Pt-out/CNTs). The effects of Pt loading and reaction solvents on phenol hydrogenation were investigated. The Pt nanoparticles in Pt-in/CNTs versus Pt-out/CNTs are smaller and better dispersed. The catalytic activity and reuse stability toward phenol hydrogenation both improved markedly. The dichloromethane-water mixture as the reaction solvent, compared with either pure medium, decreased the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-in/CNTs, but significantly improved the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-out/CNTs.

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Enhancement of activity, selectivity and stability of CNTs-supported cobalt catalyst in Fischer–Tropsch via CNTs functionalization

Cited by 56 publications

References 41 publications

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Effects of particle size on the catalytic performance of MWCNTs supported alkalized MoS₂ catalysts promoted by Ni and Co in higher alcohols synthesis

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

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Enhancement of activity, selectivity and stability of CNTs-supported cobalt catalyst in Fischer–Tropsch via CNTs functionalization

Cited by 56 publications

References 41 publications

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Effects of particle size on the catalytic performance of MWCNTs supported alkalized MoS2 catalysts promoted by Ni and Co in higher alcohols synthesis

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

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Effects of particle size on the catalytic performance of MWCNTs supported alkalized MoS₂ catalysts promoted by Ni and Co in higher alcohols synthesis