Autocatalytic modification of coal tar pitch using benzoyl chloride and its effect on the structure of char

Cao, Qi; Guo, Liang-cheng; Dong, Yang; Xie, Xiaolin; Jin, Lisheng

doi:10.1016/j.fuproc.2014.08.017

Cited by 29 publications

(12 citation statements)

References 19 publications

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“…Needle coke is a type of high-quality pitch-derived coke with a fibrous structure when viewed under a polarized microscope. , It is considered as a highly suitable precursor to produce mechanical materials and functional materials with its high true density, low coefficient of thermal expansion (CTE), high strength, low resistivity, low ash, low sulfur, low volatility, and easy graphitization. − For example, needle coke is generally accepted as the precursor to produce ultra-high-power graphite electrodes, , anode material of lithium ion batteries, , high energy density supercapacitors, − matrix reinforced materials, , superactivated carbon, graphene, perovskite solar cells, and so on.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Zhu

et al. 2020

Energy Fuels

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Refined coal tar pitch is considered as a promising material for the production of needle coke owing to its excellent physical–chemical properties. It was generally accepted that the basic properties of refined coal pitch played a vital role in affecting the resulting quality of the derived needle coke during the delayed coking process. Our previous research showed that an f a of 0.95–0.98 of refined coal pitch was optimal and produced needle coke of the highest quality. What is more, we found that the contents of β resin in refined pitch were also important to the properties (microstructure, microstrength, and true density) of the derived needle coke. Therefore, the effects of the contents of β resin on the properties of needle coke were investigated thoroughly, and eight types of refined coal pitch (the f a range from 0.9621 to 0.9725) with varied contents of β resin were employed as the precursors of needle coke. The techniques of proton nuclear magnetic resonance and gel permeation chromatography were utilized to determine the f a and molecular weight of each refined coal pitch, respectively. Microstructures (optical microstructure and surface morphology) have been analyzed by polarizing microscopy and scanning electron microscopy, separately. X-ray diffraction, Raman spectra, and curve-fitting enabled the quantitative examination of the microcrystalline structure. What is more, the microstrength and true density of each needle coke have also been examined in this study. It was concluded that a β resin content of 13–16% in the refined coal pitch achieved the best results and was optimal for needle coke production.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Zhu

et al. 2020

Energy Fuels

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“…Excellent physical and chemical properties of needle coke [such as high mechanical strength, conductivity, and density as well as low coefficient of thermal expansion (CTE) and ash content] make needle coke an outstanding raw material to obtain high-quality artificial graphite. − Needle coke is currently widely used in ultrahigh-power electrodes, as active anode material as well as nuclear graphite, and to substitute a superactivated carbon. − …”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Coal-Pitch-Based Needle Coke (Part III): The Effects of Quinoline Insoluble in Coal Tar Pitch

Zhu

Liu

et al. 2020

Energy Fuels

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High-temperature coal tar pitch is often used to produce high-quality needle coke. Its basic properties [such as f a value, β resin, and quinoline insoluble (QI) content] significantly affect the quality of the resulting needle coke. Refined pitch with f a and β-resin values in the 0.95–0.98 and 13–16% ranges, respectively, is considered an excellent raw material for this purpose. The influence of QI content on the characteristics of coal-based needle coke is still not fully clarified in the literature. To analyze how QI content affects coal-based needle coke properties, this work used 10 different kinds of coal tar pitch (refined from the same source) with different QI contents for the needle coke production. We thoroughly analyzed optical microstructure and crystalline sizes, surface morphology and microstrength, true density, and coefficient of thermal expansion (CTE) of the resulting products. The high-temperature coal tar pitch with the QI content of <0.8% was a preferable raw material to obtain superior needle coke; it possessed higher density and microstrength, lower CTE, and graphitized more easily than cokes with other parameters.

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“…Analysis method: to distinguish different coke types, i.e., mosaic structure, fine fiber, coarse fiber, small block, and large block structure, the method and classification recommended by the literature are adopted, [23][24][25][26] as shown in Table 2. According to the industry standard YB/T 077-1995, 300 effective counting points were selected, and the technical points were counted and classified by Excel software.…”

Section: Polarizing Analysismentioning

confidence: 99%

Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

Tian

Huang

Yu³

et al. 2021

Adv Eng Mater

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Needle coke is a type of high-quality coke with needle-like texture and layer structure. [1] Also, it presents a turbine carbon structure under the scanning electron microscope. [2,3] Needle coke was acknowledged as an exceptional raw material to obtain carbon materials, because it has low coefficient of thermal expansion (CTE), high mechanical strength, easy to graphitization, and other advantages. Therefore, it is widespread used in lithium battery anode materials, high-power, ultrahigh-power graphite electrodes, and so on. [4,5] At present, residual heavy oil, catalytic cracking slurry, and high-temperature coal tar pitch are commonly used to prepare needle coke. [6][7][8] The heavy pitch component of medium-and lowtemperature coal tar has the advantages of high aromaticity, low quinoline insoluble (QI) content, and narrower molecular weight distribution. [9] So, it is an excellent raw material for the preparation of needle coke. However, the higher heteroatom content and saturation in the raw materials lead to higher thermal reaction rate in a carbonization process, which is unfavorable to prepare needle coke and the mesophase with a wide-area streamline structure. [10,11] Because the mesophase with an orderly wide-area streamlined structure is precursor for the production of high-performance green needle coke during the coke is pulled by the airflow. [12] The appropriate pretreatment methods are used to reduce the thermal reactivity of raw materials, which is essential for preparing mesophase pitch. Garcia et al. [11] reported that the

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Autocatalytic modification of coal tar pitch using benzoyl chloride and its effect on the structure of char

Cited by 29 publications

References 19 publications

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Preparation and Characterization of Coal Pitch-Based Needle Coke (Part II): The Effects of β Resin in Refined Coal Pitch

Preparation and Characterization of Coal-Pitch-Based Needle Coke (Part III): The Effects of Quinoline Insoluble in Coal Tar Pitch

Co‐Carbonization of Medium‐ and Low‐Temperature Coal Tar Pitch and Coal‐Based Hydrogenated Diesel Oil Prepare Mesophase Pitch for Needle Coke Precursor

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