Highly active Co/SiC catalysts with controllable dispersion and reducibility for Fischer–Tropsch synthesis

Yu, Liangsong; Liu, Xiaohao; Fang, Yanan; Wang, Chunling; Sun, Yuhan

doi:10.1016/j.fuel.2013.04.072

Cited by 33 publications

(27 citation statements)

References 24 publications

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“…1, the XRD peaks ascribed to ZSM-5 became more intense with increasing ZSM-5 in the catalyst as expected, while all catalysts showed the presence of well-defined reflection characteristics for Co 3 O 4 at 31.3°, 36.8°, 44.8°, 59.4°and 65.2°, indicating the presence of crystalline cobalt species of Co 3 O 4 spinel [8]. The nano crystal size thus determined offered an opportunity to examine the effect of nano crystal sizes of the composite materials in catalysis while it is understood that the absolute crystal sizes may not be highly accurate [37].…”

Section: Crystalline Phase Of Catalystssupporting

confidence: 77%

“…The high cost of Ru has hindered its industrial-scale application and as such, Ru is often limited to laboratory studies [2,7]. Between Fe and Co, Co-based catalysts for FTS are usually preferred due to their high selectivity in linear paraffin fractions, slow deactivation, less oxygenates and low water-gas shift (WGS) activity [2,[8][9][10][11]. Although many catalysts have been developed, selectivity control towards gasoline and middle distillate is one of the most important and difficult challenges.…”

Section: Introductionmentioning

confidence: 99%

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A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

Han

et al. 2015

Fuel Processing Technology

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a b s t r a c t a r t i c l e i n f oA series of ZSM-5/SBA-15 composite supported Co catalysts were prepared and evaluated for the Fischer-Tropsch synthesis (FTS) aimed to maximise the selectivity of C 5 -C 22 hydrocarbons in the product. The composite support was prepared by physically mixing ZSM-5 and SBA-15 of varying proportions and the finished catalysts had a constant Co loading of 15wt.%. The catalysts were tested for their performance in a high pressure fixed-bed reactor operating at T = 240°C, P = 2.0 MPa, H 2 /CO = 2 and GHSV = 1000 h −1. The composite supported catalysts were shown to have much improved catalytic performance over the respective single material supported catalysts. The catalyst with 20wt.% ZSM-5 in the composite support gave the maximum CO conversion (90.6%), maximum selectivity of C 5 -C 22 hydrocarbons (70.0%) and minimum selectivity of light hydrocarbons (13.3% for CH 4 and 7.0% for C 2 -C 4 alkanes). The catalysts were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy with an energy dispersive X-ray spectrometer, temperature programmed desorption and temperature programmed reduction. It was revealed that the superior catalytic performance can be attributed to the large pore size and high dispersion of Co 3 O 4 , which afforded an optimum reducibility and acid site density.

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Section: Crystalline Phase Of Catalystssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

Han

et al. 2015

Fuel Processing Technology

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“…42-1467. 13,14,45,46 The calculated This journal is © The Royal Society of Chemistry 2015 T2 max /T1 max deconvoluted peak area ratio were 0.47, 0.26, and 0.20 for 10, 20, and 30Co/SBA-15 catalysts, respectively. 5c and d Fig.…”

Section: Resultsmentioning

confidence: 96%

“…14,35 Thus, the efficient control of cobalt dispersion and reducibility in the preparation of SBA-15-supported catalysts is of great importance to improve the FTS catalytic performance, such as activities and selectivities. 14,35 Thus, the efficient control of cobalt dispersion and reducibility in the preparation of SBA-15-supported catalysts is of great importance to improve the FTS catalytic performance, such as activities and selectivities.…”

Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch synthesis of liquid hydrocarbons over mesoporous SBA-15 supported cobalt catalysts

Zhou

Han

et al. 2015

RSC Adv.

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The influence of cobalt loading (10-30 wt% Co) and pore size of SBA-15 support on the physico-chemical and catalytic performance of mesoporous Co/SBA-15 catalysts for the Fischer-Tropsch synthesis (FTS) reaction (T ¼ 245 C, P ¼ 290 psig, H 2 /CO ¼ 2, and GHSV ¼ 2000 h À1 ) has been investigated. Catalysts were characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), electron microscopy, and temperatureprogrammed reduction (TPR). The dispersion of Co/SBA-15 decreased and the extent of cobalt reduction increased with increasing either the cobalt loading or pore size of SBA-15. A maximum CO conversion was found for the sample with 20 wt% Co loading. More methane and less C 5+ hydrocarbons were produced over less reducible 10 wt% Co loaded sample. The 20Co/SBA-15 catalysts with larger pores led to larger cobalt crystallite size, lower dispersion and higher reducibility. CO conversion increased with the increase of pore size in the range studied. The 20Co/SBA-15 catalysts with larger cobalt crystallite size showed higher C 5+ selectivity for the FTS. Finally, at comparable Co loading, CO conversion of Co/SBA-15 catalysts were to be about 2 times greater than a Co/SiO 2 sample, with only a minor difference in product selectivity. ¼ 96/d (Co 0 ) . d Estimated from H 2 consumption of TPR proles below 400 C.59796 | RSC Adv., 2015, 5, 59792-59803This journal is

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“…Lee et al [176] found that the formation of filamentous carbon is probably the cause of the deactivation of the SiCbased catalysts. Yu et al [181] suggested that the addition of ZrO 2 could improve the stability of the SiC-based catalysts by avoiding sintering of the cobalt active sites during the FT reaction. In addition, in the report by Liu et al [177] TEM analysis did not provide any evidence for the formation of CNTs over several hundreds of hours of reaction on the SiC-based catalyst.…”

Section: Active Phase and Support Recoverymentioning

confidence: 99%

Fischer–Tropsch Reaction on a Thermally Conductive and Reusable Silicon Carbide Support

et al. 2014

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The Fischer-Tropsch (FT) process, in which synthesis gas (syngas) derived from coal, natural gas, and biomass is converted into synthetic liquid fuels and chemicals, is a strongly exothermic reaction, and thus, a large amount of heat is generated during the reaction that could severely modify the overall selectivity of the process. In this Review, we report the advantages that can be offered by different thermally conductive supports, that is, carbon nanomaterials and silicon carbide, pure or doped with different promoters, for the development of more active and selective FT catalysts. This Review follows a discussion regarding the clear trend in the advantages and drawbacks of these systems in terms of energy efficiency and catalytic performance for this most-demanded catalytic process. It is demonstrated that the use of a support with an appropriate pore size and thermal conductivity is an effective strategy to tune and improve the activity of the catalyst and to improve product selectivity in the FT process. The active phase and the recovery of the support, which also represents a main concern in terms of the large amount of FT catalyst used and the cost of the active cobalt phase, is also discussed within the framework of this Review. It is expected that a thermally conductive support such as β-SiC will not only improve the development of the FT process, but that it will also be part of a new support for different catalytic processes for which high catalytic performance and selectivity are strongly needed.

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Highly active Co/SiC catalysts with controllable dispersion and reducibility for Fischer–Tropsch synthesis

Cited by 33 publications

References 24 publications

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

A preliminary evaluation of ZSM-5/SBA-15 composite supported Co catalysts for Fischer–Tropsch synthesis

Fischer–Tropsch synthesis of liquid hydrocarbons over mesoporous SBA-15 supported cobalt catalysts

Fischer–Tropsch Reaction on a Thermally Conductive and Reusable Silicon Carbide Support

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