Transformation of primary siderite during coal catalytic pyrolysis and its effects on the growth of carbon nanotubes

Zhang, Tiankai; Wang, Qi; Lv, Xuemei; Luo, Yunhuan; Zhang, Yongfa

doi:10.1016/j.fuproc.2019.106235

Cited by 18 publications

(5 citation statements)

References 54 publications

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“…6, it can be seen that the four reacted catalysts mainly contain iron carbides (Fe3C and Fe5C2) and Fe phases after reaction, suggesting that -Fe2O3 was fully reduced to Fe by the generated gas and then the reduced Fe was partically carbonised. Similar phase transformation of -Fe2O3 to Fe3C was also reported in the recent study (Zhang et al, 2020). For the 5Mn10Fe and 10Mn10Fe catalysts, there are additional peaks detected in the XRD patterns, indicating the existence of MnO phase.…”

Section: X-ray Diffraction (Xrd) Of Reacted Catalystssupporting

confidence: 88%

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Zhang

et al. 2021

Journal of Hazardous Materials

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Thermo-chemical conversion is a promising technology for the recycle of waste plastics, as it can produce high-value products such as carbon nanotubes (CNTs) and hydrogen. However, the low yield of CNTs is one of the challenges. In this work, the addition of Mn (0 wt.%, 1 wt.%, 5 wt.%, and 10 wt.%) to Fe-based catalyst to improve the production of CNTs has been investigated. Results show that the increase of Mn content from 0 wt.% to 10 wt.% significantly promotes CNTs yield formed on the catalyst from 23.4 wt.% to 32.9 wt.%. The results show that Fe-particles in the fresh catalysts are between 10-25 nm. And the addition of Mn in the Febased catalyst enhanced the metal-support interactions and the dispersion of metal particles, thus leading to the improved catalytic performance in relation to filamentous carbon growth. In addition, the graphitization of CNTs is promoted with the increase of Mn content. Overall, in terms of the quantity and quality of the produced CNTs, 5 wt.% of Mn in Fe-based catalyst shows the best catalytic performance, due to the further increase of Mn content from 5 wt.% to 10 wt.% led to a dramatic decrease of purity by 10 wt.%.

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Section: X-ray Diffraction (Xrd) Of Reacted Catalystssupporting

confidence: 88%

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Zhang

et al. 2021

Journal of Hazardous Materials

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“…Among these methods, catalytic pyrolysis is attractive because of the low‐temperature conditions and scalable production with good control in alignment, density, and diameter of CNTs. Generally, the CNTs can be prepared by the decomposition of biopolymers (e.g., cellulose [ 6 ] ), sugars (e.g., glucose [ 7 ] ), and light hydrocarbons (e.g., CH 4 , [ 8 ] C 2 H 2 [ 9 ] ) on the metal catalysts (e.g., Ni, [ 10 ] Co, [ 11 ] or Fe [ 12 ] ‐based nanoparticles). Herein, we introduce this strategy to construct a novel CNTs‐based functional material, where the metal nanocrystals were used as a catalyst to trigger the in‐situ formation of a new CNTs network on metal oxide, giving rise to the high‐performance metal oxide/CNTs‐based materials for lithium‐ion batteries (LIBs).…”

Section: Introductionmentioning

confidence: 99%

Metal Catalyst to Construct Carbon Nanotubes Networks on Metal Oxide Microparticles towards Designing High‐Performance Electrode for High‐Voltage Lithium‐Ion Batteries

Sun

Cao

Zhang

et al. 2021

Adv Funct Materials

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Designing carbon nanotubes (CNTs)-based materials are attracting great attention due to their fantastic properties and greater performance. Herein, a new CNTs network triggered by metal catalysts (e.g., Co, Ni, or Cu) is constructed on metal oxide (e.g., MnO) microparticles, giving rise to a high-performance Co-MnO@C-CNTs anode in lithium-ion batteries (LIBs). An extremely high capacity of 1050 mAh g −1 , extraordinary rate capacities over 10 A g −1 , and a long lifespan over 500 cycles are demonstrated. The great features of Co-MnO@C-CNTs anode are further confirmed in LIBs when the nickel-rich cathode (e.g., LiNi 0.8 Co 0.1 Mn 0.1 O 2 ) is used and charged at a high voltage over 4.5 V. A high-capacity retention of 71.5% can be maintained at 1 C over 150 cycles. The superior performance relates to the CNTs network, which not only acts as an "expressway network" for fast ion/electron transportation but also buffers structural variation. Moreover, the metal nanoparticles can also enhance the electrical conductivity and catalyze the (de-)lithiation of metal oxide, resulting in higher reversibility and long-term cyclability. This study opens a new avenue to prepare CNTs-based functional materials and also explores the potential applications of metal oxide-based anode for high-performance batteries.

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“…As the concentration of the carbon matrix inside the catalyst gradually increases and reaches saturation, these carbon matrixes grow as carbon nanotubes on the catalyst particle surface. The surface of Fe 3 C catalyst particles with a moderate size produces carbon nanotubes, while smaller or larger particles are eventually coated with carbon shells. − …”

Section: Resultsmentioning

confidence: 99%

Fe₃C@C/CNT Hybrids Derived from Catalytic Pyrolysis of Lignite: Electrocatalysts for OER

Liu

et al. 2023

Energy Fuels

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Using lignite as the raw material to prepare a new OER catalyst, and thus to make high-value use of lignite and to meet the research and development needs for new energy materials at the same time, a novel Fe/Fe 3 C active species has been reported as a promising catalyst to replace precious metals. In this study, we developed a facile method for the preparation of Fe 3 C@C/CNT hybrid materials by catalytic pyrolysis of lignite using KOH and FeCO 3 . The structural characteristic of Fe 3 C@C/CNT hybrid materials is that Fe 3 C nanoparticles are encapsulated in carbon layers and carbon nanotubes, forming a special core−shell structure. The prepared materials have good graphitization and a large specific surface area (957 m 2 g −1 ). We discussed the effects of KOH, FeCO 3 , and melamine in the catalytic pyrolysis of lignite to produce Fe 3 C@C/CNT materials:(1) Lignite can be catalyzed by KOH to generate carbon nanotubes and porous structures. (2) The transformation of carbon matrix to graphitic carbon is catalyzed and the Fe source for Fe 3 C is provided by FeCO 3 . (3) The aggregation of Fe into large and irregular Fe nanoparticles is inhibited by melamine, which facilitates the generation of Fe 3 C. When the Fe 3 C@C/CNT hybrid is used as an OER catalyst, the OER overpotential is only 407 mV at a current density of 10 mA cm −2 in an alkaline electrolyte, which has great application potential. This work is conducive to improving the economic benefits of lignite and provides a new idea for the high value-added utilization of lignite.

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Transformation of primary siderite during coal catalytic pyrolysis and its effects on the growth of carbon nanotubes

Cited by 18 publications

References 54 publications

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Metal Catalyst to Construct Carbon Nanotubes Networks on Metal Oxide Microparticles towards Designing High‐Performance Electrode for High‐Voltage Lithium‐Ion Batteries

Fe₃C@C/CNT Hybrids Derived from Catalytic Pyrolysis of Lignite: Electrocatalysts for OER

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Transformation of primary siderite during coal catalytic pyrolysis and its effects on the growth of carbon nanotubes

Cited by 18 publications

References 54 publications

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Metal Catalyst to Construct Carbon Nanotubes Networks on Metal Oxide Microparticles towards Designing High‐Performance Electrode for High‐Voltage Lithium‐Ion Batteries

Fe3C@C/CNT Hybrids Derived from Catalytic Pyrolysis of Lignite: Electrocatalysts for OER

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Fe₃C@C/CNT Hybrids Derived from Catalytic Pyrolysis of Lignite: Electrocatalysts for OER