Preparation of mesocarbon microbeads from coal tar pitch with blending of biomass tar pitch

Carbon nanotube-Mesocarbon microbead composites were synthesized from coal tar pitch with carbon nanotubes (CNTs) as additive. The effect of CNTs addition and process parameters on the growth and morphologies of Mesocarbon microbeads (MCMBs) was investigated. The results show that adding CNTs enhances the nucleation and inhibits the growth and coalescence of MCMBs. Under the same thermal condensation conditions, the MCMBs made in the presence of CNTs tend to have smaller size, lower yield and more uniform size distribution, but more CNTs can lead to poor spherical degrees. Compared with the raw CNTs, the CNTs treated with blended acid can achieve better sphere and more uniform MCMBs with increasing CNTs ratio.

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Mechanisms and characteristics of mesocarbon microbeads prepared by co-carbonization of coal tar pitch and direct coal liquefaction residue

International Journal of Coal Science & Technology ◽

10.1007/s40789-019-00271-6 ◽

2019 ◽

Vol 6 (4) ◽

pp. 633-642 ◽

Cited By ~ 2

Author(s):

Bingfeng Yan ◽

Guangyao Wang

Keyword(s):

Coal Tar ◽

Proton Donor ◽

Coal Liquefaction ◽

Electrical Performance ◽

Coal Tar Pitch ◽

Particle Sizes ◽

Mesocarbon Microbeads ◽

Tap Density ◽

Direct Coal Liquefaction ◽

Coal Liquefaction Residue

Abstract DCLR-P was prepared by direct coal liquefaction residue (DCLR) with ash removal. In the present experiments, mesocarbon microbeads (MCMBs) were prepared by co-carbonization of coal tar pitch (CTP) and DCLR-P. With the increase of DCLR-P content, the yield of MCMBs increased from 47.8% to 56.8%. At the same time, the particle sizes distribution of MCMBs was narrowed, resulting in the decrease of D90/D10 ratio from 154.88 to 6.53. The results showed that DCLR-P had a positive effect on the preparation of MCMBs. 1H-NMR, FTIR, SEM and XRD were used to analyze the mechanisms and characteristics of MCMBs prepared by co-carbonization of CTP and DCLR-P. The results showed that the Proton Donor Quality Index (PDQI) of DCLR-P was 13.32, significantly higher than that of CTP (0.83). This indicated that DCLR-P had more naphthenic structure than CTP, which leads to hydrogen transferring in polycondensation reaction. The aliphatic structure of DCLR-P can improve the solubility and fusibility of mesophase, thereby making the structure of MCMBs more structured. The microstructure of the graphitized MCMBs had a substantially parallel carbon layer useful for its electrical performance. The performance of graphitized MCMBs as a negative electrode material for Li-ion batteries was tested. The particle sizes, tap density, specific surface area and initial charge–discharge efficiency of graphitized MCMBs met the requirements of CMB-I in GB/T-24533-2009. However, the initial discharge capacity of graphitized MCMB was only 296.3 mA h g−1 due to the low degree of graphitization of MCMBs.

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Preparation and Growth Characteristics of Mesocarbon Microbeads

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1121 ◽

2013 ◽

Vol 750-752 ◽

pp. 1121-1124 ◽

Cited By ~ 1

Author(s):

Zhi Wang ◽

Chun Hong Yu

Keyword(s):

Electron Microscopy ◽

Coal Tar ◽

Growth Characteristics ◽

Coal Tar Pitch ◽

Growth Time ◽

Optimum Temperature ◽

Mesocarbon Microbeads ◽

Particle Size Analyzer ◽

Partical Size ◽

Scanning Electron

Mesocarbon microbeads (MCMBs) have been synthesized from coal tar pitch. Scanning electron microscopy (SEM) and laser particle size analyzer were used to evaluate the structure and partical size. The effect of process parameters on the growth and morphologies of MCMBs was investigated. The results show that the optimum temperature range is 410-430 °C and the growth time has a suitable range. The diameter and yield of MCMBs will increase and the spherical degree does not change with the extension of time.

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Efficient preparation of mesocarbon microbeads by pyrolysis of coal-tar pitch in the presence of rosin

Journal of Analytical and Applied Pyrolysis ◽

10.1016/j.jaap.2011.03.005 ◽

2011 ◽

Vol 91 (2) ◽

pp. 310-315 ◽

Cited By ~ 15

Author(s):

Youjie Yang ◽

Qilang Lin ◽

Yunqing Huang ◽

Danyu Guo

Keyword(s):

Coal Tar ◽

Coal Tar Pitch ◽

Mesocarbon Microbeads

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Effects of the addition of coal tar pitch-based mesocarbon microbeads on the preparation of mesophase pitch

E3S Web of Conferences ◽

10.1051/e3sconf/202125703015 ◽

2021 ◽

Vol 257 ◽

pp. 03015

Author(s):

Xin Gong ◽

Xiaodong Liu ◽

Dong Liu

Keyword(s):

Softening Point ◽

Coal Tar ◽

Atomic Ratio ◽

Coal Tar Pitch ◽

Mesophase Pitch ◽

Chemical Reaction Kinetics ◽

Mesocarbon Microbeads ◽

Stacking Order ◽

Order Degree ◽

Addition Amount

Mesophase pitch was prepared by co-carbonization of the hydrocracking tail oil (HCTO) and coal tar pitch-based mesocarbon microbeads (MCMB). The effects of the addition amount of coal tar-based MCMBs on the C/H atomic ratio, softening point, carbon residue, optical texture, aromatic lamellae stacking order degree, and chemical reaction kinetics of mesophase pitch were investigated. The results show that MCMB can be used as a nucleating agent to accelerate the nucleation of mesophase spheres and reduce the energy barriers for the formation of the anisotropic phase. However, excessive MCMB greatly increases the viscosity of the pitch matrix and weakens the mobility of condensed aromatic macromolecules, leading to the formation of mesophase pitch with a mosaic structure and poor lamellar orientation. When the addition amount of MCMB is 5 wt%, the mesophase pitch with a large domain texture, high aromatic lamellar stacking order degree, and low softening point can be formed. This work provides a pathway to efficiently prepare mesophase pitch without catalyst removal.

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Effects of AlCl3-NaCl Content on the Formation of Mesocarbon Microbeads

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.2343 ◽

2010 ◽

Vol 8 (1) ◽

Author(s):

Youliang Cheng ◽

Tiehu Li ◽

Xianliang Hou ◽

Deqi Jing ◽

Qiang Zhuang ◽

...

Keyword(s):

Molten Salt ◽

Coal Tar ◽

Salt Content ◽

Weight Ratio ◽

Small Dimension ◽

Coal Tar Pitch ◽

Microcrystalline Structure ◽

Salt Mixture ◽

Mesocarbon Microbeads ◽

Molecular Layers

Mesocarbon microbeads (MCMB) have been synthesized from coal tar pitch with the molten salt mixture composed of AlCl3 and NaCl at 300°C for 1h. The effects of the molten salt on the synthesis of MCMB have been studied. The results indicate that the content of molten salt has an important effect on the formation of mesophase, and the polymerization basically reaches the equilibrium when the weight ratio of molten salt mixture to coal tar pitch is 1. The molten salt can promote the formation of mesophase at low temperature, and the pyrolytic products show the optical anisotropy. Microcrystalline structure of extracted product gets more regular and the yield increases with the molten salt content increasing, but microcrystalline structure at the ratio of 1 gets disordered. When the ratio is over 2, the yield is high, and the obtained MCMB show a smooth surface, small dimension and lamellar structures whose building units are molecular layers.

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Preparation and Structures of Mesocarbon Microbeads

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.251.301 ◽

2012 ◽

Vol 251 ◽

pp. 301-303 ◽

Cited By ~ 1

Author(s):

Hai Zhao ◽

Jun Qing Liu ◽

Bao Hui Wang ◽

Cheng Qiu Hu

Keyword(s):

Light Microscopy ◽

Coal Tar ◽

Polarized Light ◽

Polarized Light Microscopy ◽

Coal Tar Pitch ◽

Mesocarbon Microbeads ◽

Notable Effect ◽

Optical Textures

MCMB were prepared from coal-tar pitch by pyrolysis condensation in the presence of graphite. The characteristics of the MCMB were studied by BET and optical textures of the pitch mixtures were characterized by polarized-light microscopy. Results show that the graphite addition contributes to an increase of MCMB yield. The pyrolysis conditions and content of graphite have notable effect on the structure and yields of MCMB. When content of graphite reaches 3% and the pitch are pyrolysated at 450°C for 4 h, the MCMB yield arrive at 32wt%.

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