Morphology control of Co2C nanostructures via the reduction process for direct production of lower olefins from syngas

An, Yunlei; Zhao, Yue; Yu, Fei; Lin, Tiejun; Lu, Yonglin; Li, Shenggang; Li, Zhengjia; Dai, Yuanyuan; Wang, Xinxing; Wang, Hui; Zhong, Liangshu; Sun, Yuhan

doi:10.1016/j.jcat.2018.03.024

Cited by 54 publications

(73 citation statements)

References 44 publications

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“…Co 2 C nanoprisms possessed higher activity due to its lower CO dissociation energy barrier. [17] With increasing Mn/Co ratio from 0.33 to 3, the apparent activation energy for CO hydrogenation decreased gradually from 149 kJ mol À 1 to 113 kJ mol À 1 , which suggested that the increase of the proportion of Co 2 C (020) facet could decrease the CO dissociation energy barrier.…”

Section: Kinetic Studymentioning

confidence: 94%

“…Based on theory study, HCP-Co was belonged to the D 3h point group and it exhibited a dihedral-like shape with two closed packed (0001) facets, while FCC-Co had an octahedron-like shape composed of (100), (110), (310) and (111) facets. In addition, the reaction rates for (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), (10)(11), (10)(11)(12), and (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) facets of HCP-Co were higher than that for the exposed facets of FCC-Co. [5] During the FT reaction process, many products including paraffins, olefins and oxygenates are generated simultaneously. For the traditional FT catalysts, paraffins are the main products with ASF distribution.…”

Section: Introductionmentioning

confidence: 93%

“…However, a new peak located at 200°C-300°C appeared in the TPR profiles was observed with Mn addition, which could be attributed to the reduction process of Co x Mn 1-x O. [17] TEM Transmission electron microscopy (TEM) images of the spent samples with different Mn/Co ratio were displayed in Figure 3. Co 2 C nanospheres were found in the spent Co 3 O 4 catalyst and the lattice distance of 1.98 Å was assigned to the Co 2 C(210) facet.…”

Section: H 2 -Tprmentioning

confidence: 99%

“…The above results agreed well with our previous conclusion that the Co 2 C nanoprisms possessed higher activity and lower CH 4 selectivity than Co 2 C nanospheres. [17] In addition, the C 5 + + Oxy. selectivity increased from 23.9 C% to 68.9 C% as increasing the Mn/Co ratio from 0.33 to 3.…”

Section: Catalytic Performancementioning

confidence: 99%

“…Compared with Co 2 C(020) facet, the barrier for CO dissociative adsorption was higher on the Co 2 C(101) surface, and the Co 2 C(101) was more active for CH 4 formation. [17] However, further experimental results are still needed to reveal the facet effect of Co 2 C in syngas conversion. Co 2 C nanoprisms are composed of Co 2 C(020) and Co 2 C(101) facets, it seems feasible to tune the catalytic performance via control the preferential facet of Co 2 C nanoprisms.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Lin

Gong

et al. 2020

ChemCatChem

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Cobalt carbide (Co2C) exhibits strong facet effect for Fischer‐Tropsch to olefins (FTO) reaction. Herein, we report that the facet proportion of Co2C nanostructures can be tuned effectively by incorporating and altering the Mn content in the CoMn composite oxide as catalyst precursor. With the addition of Mn promoter, the Co2C nanoprisms with exposed (020) and (101) facets are generated under reaction conditions. In addition, the facet proportion of Co2C(020) facet can be effectively improved by enhancing the Mn/Co ratio. With the increase of facet proportion of Co2C(020)/Co2C(101) ratio, the as‐obtained Co2C nanoprisms exhibit higher intrinsic activity and lower methane selectivity during the syngas conversion process. Kinetic experiments also demonstrate that the apparent activation energy (Ea) for CO conversion is significantly reduced as increasing the facet proportion of Co2C(020). This work provides a simple and feasible way to tune the exposed facet proportion for the rational design of Co2C nanocatalyst for FTO reaction.

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Section: Kinetic Studymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 93%

Section: H 2 -Tprmentioning

confidence: 99%

Section: Catalytic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Lin

Gong

et al. 2020

ChemCatChem

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Advances in F ischer– T ropsch Synthesis for the Production of Fuels and Chemicals

Zhong¹

2022

Heterogeneous Catalysis for Sustainable Energy

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Visualizing Phase Evolution of Co₂C for Efficient Fischer–Tropsch to Olefins

Hong,

Zhao,

Chen

et al. 2024

Advanced Materials

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Cobalt carbide (Co2C) possesses high catalytic efficiency Fischer–Tropsch synthesis (FTS), while the products selectivity appears sensitive to crystallography geometry. Since the Anderson–Schulz–Flory (ASF) distribution in FTS is broken through fabricating facetted Co2C nanocrystals, yet the underlying mechanism of Co2C crystallization remains unclarified suffering from sophisticated catalyst composition involving promoter agents. Herein, the synthesis of high‐purity single‐crystal nanoprisms (Co2C‐p) for highly efficient FTS is reported to lower olefins. Through comprehensive microstructure analysis, e.g., high‐resolution TEM, in situ TEM and electron diffraction, as well as finite element simulation of gas flow field, for the first time the full roadmap of forming catalytic active cobalt carbides is disclosed, starting from reduction of Co3O4 precursor to CoO intermediate, then carburization into Co2C‐s and subsequent ripening growth into Co2C‐p. This gas‐induced engineering of crystal phase provides a new synthesis strategy, with many new possibilities for precise design of metal‐based catalyst for diverse catalytic applications.

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Morphology control of Co2C nanostructures via the reduction process for direct production of lower olefins from syngas

Cited by 54 publications

References 44 publications

Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Advances in F ischer– T ropsch Synthesis for the Production of Fuels and Chemicals

Visualizing Phase Evolution of Co₂C for Efficient Fischer–Tropsch to Olefins

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Morphology control of Co2C nanostructures via the reduction process for direct production of lower olefins from syngas

Cited by 54 publications

References 44 publications

Tuning the Facet Proportion of Co2C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Tuning the Facet Proportion of Co2C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Advances in F ischer– T ropsch Synthesis for the Production of Fuels and Chemicals

Visualizing Phase Evolution of Co2C for Efficient Fischer–Tropsch to Olefins

Contact Info

Product

Resources

About

Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Tuning the Facet Proportion of Co₂C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins

Visualizing Phase Evolution of Co₂C for Efficient Fischer–Tropsch to Olefins