Formation of surface cobalt structures in SiC-supported Fischer–Tropsch catalysts

Соломоник, И. Г.; Gryaznov, K. O.; Мордкович, В. З.

doi:10.1039/c5ra11853k

“…[51]. With regard to the use of SiC as a support, it is also worth mentioning that the formation of the active cobalt phase was observed to be strongly affected by the very nature of the b-SiC material, despite highly similar manufacturer specifications [52]. Different from impregnation methods, colloidal cobalt particle precursors are uniform in size and rather remote from each other after deposition into the mesoporous SiC structure (Fig.…”

Section: Stem Characterizationmentioning

confidence: 99%

Superior Fischer-Tropsch performance of uniform cobalt nanoparticles deposited into mesoporous SiC

Iablokov

¹

,

Алексеев

²

,

Gryn

³

et al. 2020

Journal of Catalysis

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a b s t r a c tElectrochemically-derived well-crystalline mesoporous silicon carbide (pSiC) was used as a host for cobalt nanoparticles to demonstrate superior catalytic performance during the CO hydrogenation according to Fischer-Tropsch. Colloidal Co nanoparticles (9 ± 0.4 nm) were prepared independently using colloidal recipes before incorporating them into pSiC and, for comparison purposes, into commercially available silica (Davisil) as well as foam-like MCF-17 supports. The Co/pSiC catalyst demonstrated the highest (per unit mass) catalytic activity of 117 lmol CO g Co À1 s À1 at 220°C which was larger by about one order of magnitude as compared to both silica supported cobalt catalysts. Furthermore, a significantly higher C 5+ hydrocarbons selectivity was observed for Co/pSiC. The stable performance of the catalyst is attributed to the high dispersion of the active phase and the use of pSiC acting as a thermally conductive and chemically inert mesoporous support.

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“…The effects of the support material, the Co loading and the addition of promotors were investigated in the first library, which consisted of 144 samples. Support materials Al2O3 [1,11,[22][23][24][25][26][27][28][29][30], TiO2 [6,11,28,[31][32][33][34][35][36][37] ZrO2 [28,32,33], SiO2 [2,11,28,32,[38][39][40][41][42][43][44][45] active carbon (AC) [27,30,46,47], and SiC [48,49] were used. Despite the reactivity of metal oxides, particularly Al2O3, with Co they were selected as supports for their porosity and thermal stability.…”

Section: Results Of the First Librarymentioning

confidence: 99%

High-Throughput Discovery of Hf Promotion on the Formation of Hcp Co and Fischer-Tropsch Activity

Rupflin¹,

Rensberg²,

Zanella³

et al. 2020

Preprint

0

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A proxy-based high-throughput experimental approach was used to explore the stability and activity of Co-based Fischer Tropsch Synthesis catalysts with different promoters on various supports. The protocol is based on the estimation by XRD of active phase, Co, particle size and relative amounts of crystalline phases, Co to support. Sequential libraries samples enabled exploration of four Co loadings with five different promoters on six support materials. Catalysts stable to aging in syngas, displaying minimal change of particle size or relative area, were evaluated for their activity under industrial conditions. This procedure identified SiC as support for stable catalysts and a combination of Ru and Hf to promote the formation hcp Co. Unsupported bulk samples of Co with appropriate amounts of Ru and Hf revealed that the formation of hcp Co is independent of the support. The hcp Co containing catalyst presented the highest catalytic activity and C<sub>5+</sub> selectivity amongst the samples tested in this study confirming the effectiveness of the proxy-based high-throughput method.

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“…The effects of the support material, the Co loading and the addition of promotors were investigated in the first library, which consisted of 144 samples. Support materials Al2O3 [3,13,[24][25][26][27][28][29][30][31][32], TiO2 [8,13,30,[33][34][35][36][37][38][39] ZrO2 [30,34,35], SiO2 [4,13,30,34,[40][41][42][43][44][45][46][47] active carbon (AC) [29,32,48,49], and SiC [50,51] were used. Despite the reactivity of metal oxides, particularly Al2O3, with Co they were selected as supports for their porosity and thermal stability.…”

Section: Results Of the First Librarymentioning

confidence: 99%

High-Throughput Discovery of Hf Promotion on the Formation of Hcp Co and Fischer-Tropsch Activity

Rupflin¹,

Rensberg²,

Zanella³

et al. 2020

Preprint

0

View full text Add to dashboard Cite

A proxy-based high-throughput experimental approach was used to explore the stability and activity of Co-based Fischer Tropsch Synthesis catalysts with different promoters on various supports. The protocol is based on the estimation by XRD of active phase, Co, particle size and relative amounts of crystalline phases, Co to support. Sequential libraries samples enabled exploration of four Co loadings with five different promoters on six support materials. Catalysts stable to aging in syngas, displaying minimal change of particle size or relative area, were evaluated for their activity under industrial conditions. This procedure identified SiC as support for stable catalysts and a combination of Ru and Hf to promote the formation hcp Co. Unsupported bulk samples of Co with appropriate amounts of Ru and Hf revealed that the formation of hcp Co is independent of the support. The hcp Co containing catalyst presented the highest catalytic activity and C<sub>5+</sub> selectivity amongst the samples tested in this study confirming the effectiveness of the proxy-based high-throughput method.

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Formation of surface cobalt structures in SiC-supported Fischer–Tropsch catalysts

Abstract: The formation of surface cobalt structures was investigated for a number of β-SiC-supported Fischer–Tropsch catalysts.

Cited by 16 publications

References 23 publications

Superior Fischer-Tropsch performance of uniform cobalt nanoparticles deposited into mesoporous SiC

Superior Fischer-Tropsch performance of uniform cobalt nanoparticles deposited into mesoporous SiC

High-Throughput Discovery of Hf Promotion on the Formation of Hcp Co and Fischer-Tropsch Activity

High-Throughput Discovery of Hf Promotion on the Formation of Hcp Co and Fischer-Tropsch Activity

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