scholarly journals XRD Characterization of the Structure of Graphites and Carbon Materials Obtained by the Low-Temperature Graphitization of Coal Tar Pitch

2015 ◽  
Vol 17 (2) ◽  
pp. 87 ◽  
Author(s):  
Ch.N. Barnakov ◽  
G.P. Khokhlova ◽  
A.N. Popova ◽  
S.A. Sozinov ◽  
Z.R. Ismagilov
Keyword(s):  
Low Temperature ◽  
Carbon Materials ◽  
Coal Tar ◽  
Structural Phase ◽  
Coherent Scattering ◽  
Amorphous Structure ◽  
Coal Tar Pitch ◽  
X Ray Diffraction ◽  
Needle Coke ◽  
The Individual

The structure of some commercial graphites and carbon materials (CMs) obtained by the low-temperature catalytic graphitization of coal tar pitch with iron salt, needle coke, foamed graphite as the catalysts has been studied. The study was performed using the X-ray diffraction technique with reflections from base plane and their decomposition into two components corresponding to the structural phases of graphite which have different XRD characteristics. Various CMs were compared with respect to the structural phase ratio, distance between polyarene layers in these phases, and sizes of the coherent scattering regions. The (004) reflection provided a better fit of some properties of graphites to the calculated XRD characteristics as compared to calculation from the (002) reflection. In the case of carbonization of coal tar pitch with investigated catalyst additions, prepared carbon materials have a higher degree of graphitization and a crystallite size greater than in the other case of carbonization of the individual pitch. The highest catalytic activity is shown by foamed graphite. It was found that the use of foamed graphite as the catalyst at 800-900 ºC produced carbon materials possessing a crystalline structure with interplanar spacing close to that in commercial graphites, while in the absence of catalyst the coal tar pitch material has an amorphous structure.

scholarly journals Study of the Carbonization and Graphitization of Coal Tar Pitch Modified with SiC Nanoparticles

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Maciej Gubernat ◽  
Tomasz Lis ◽  
Janusz Tomala ◽  
Jakub Kawala ◽  
Aneta Fraczek-Szczypta ◽  
...  
Keyword(s):  
Structural Changes ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Crystallite Growth ◽  
X Ray Diffraction ◽  
Sic Nanoparticles ◽  
X Ray ◽  
Ceramic Nanoparticles ◽  
Crystallite Sizes ◽  
Structure And Microstructure

Silicon carbide nanoparticles (nSiC) have been used to modify coal tar pitch (CTP) as a carbon binder. The influence of ceramic nanoparticles on the structure and microstructure was studied. The structure of CTP-based carbon residue with various nSiC contents was analyzed by using SEM with EDAX, Raman spectroscopy, and X-ray diffraction. The effect of ceramic nanofiller on the crystallite sizes (Lc, La) and the c-axis spacing (d002) in carbonized samples after heating from 1000 to 2800°C was analyzed. Ceramic nanofillers inhibit structural changes in carbonized samples heated to 1000°C. After heating CTP with nSiC above 2000°C, the carbon samples contained two carbon components differing in structural ordering. Ceramic nanoparticles increase carbon crystallite growth, while their impact on the c-axis spacing is low.

The effect of mechanical vibration on the structure of needle coke prepared from a modified coal tar pitch

Carbon ◽  
2018 ◽  
Vol 130 ◽  
pp. 845 ◽  
Author(s):  
Ying Wang ◽  
Ya-wei Dong ◽  
Cun-gui Zhong ◽  
Qing Cao
Keyword(s):  
Coal Tar ◽  
Mechanical Vibration ◽  
Coal Tar Pitch ◽  
Needle Coke

Carbonization of coal-tar pitch into lump needle coke in a tube bomb

1987 ◽  
Vol 22 (11) ◽  
pp. 3989-3994 ◽  
Author(s):  
Sao Mochida ◽  
You Qing Fei ◽  
Takashi Oyama ◽  
Yozo Korai ◽  
Hiroshi Fujitsu
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Needle Coke

scholarly journals Evolution of two-step structural phase transition in Fe1+dTe detected by low-temperature x-ray diffraction

2012 ◽  
Vol 152 (12) ◽  
pp. 1047-1051 ◽  
Author(s):  
Yoshikazu Mizuguchi ◽  
Kentaro Hamada ◽  
Kazuki Goto ◽  
Hiroshi Takatsu ◽  
Hiroaki Kadowaki ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray

Preparation of carbon materials by modeling of impregnating coal-tar pitch into carbon preform

2006 ◽  
Vol 172 (3) ◽  
pp. 424-430 ◽  
Author(s):  
C.Q. Ren ◽  
T.H. Li ◽  
Q.L. Lin ◽  
H. Li ◽  
X.Y. Sun
Keyword(s):  
Carbon Materials ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Carbon Preform

scholarly journals Research on Coal Tar Pitch Catalytic Oxidation and Its Effect on the Emission of PAHs during Co-Carbonation with Coal

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1428
Author(s):  
Liqing Chen ◽  
Fanhui Guo ◽  
Jianjun Wu ◽  
Ping Li ◽  
Yixin Zhang
Keyword(s):  
Catalytic Oxidation ◽  
Chemical Structure ◽  
Catalytic Mechanism ◽  
Condensation Reaction ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Air Oxidation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Polycyclic Aromatic

Coal tar pitch (CTP) is abundant and widely used, but its properties will be affected due to oxidation aging during storage. In this study, CTP was oxidized by simulating the air oxidation process, and the change of chemical structure has been analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and both gas chromatography and mass spectrometry (GCMS). The effects of the oxidized and unoxidized CTP co-carbonization with coal on the polycyclic aromatic hydrocarbons (PAHs) emission were detected by GCMS. The small and medium-molecule aromatic substances were reduced during CTP oxidation, while the intermolecular condensation reaction increased the macromolecules content. The catalytic can effectively facilitate the dehydrogenation and condensation reaction of CTP and the entry of oxygen molecules, which leads to the increase of oxygen-containing groups and the decrease of PAHs. Compared to the raw CTP, the catalytic oxidized CTP significantly reduced the emissions of toxic PAHs during the co-carbonization with coal. A possible catalytic mechanism of CTP catalytic oxidation is proposed.

Study of graphite-like materials obtained from coal-tar pitch

2020 ◽  
Vol 63 (7) ◽  
pp. 46-53
Author(s):  
Sergey A. Sozinov ◽  
◽  
Anna N. Popova ◽  
Larisa V. Sotnikova ◽  
Anastasiya S. Valnukova ◽  
...  
Keyword(s):  
Coal Tar ◽  
Functional Materials ◽  
Xrd Analysis ◽  
Physicochemical Characteristics ◽  
Coal Tar Pitch ◽  
Medium Temperature ◽  
Paramagnetic Resonance ◽  
Derivative Analysis ◽  
Composition And Structure ◽  
The Individual

In the research, the study of precursors of graphite-like materials obtained from medium-temperature coal tar pitch was carried out on the individual components of coal tar pitch by separating the multicomponent composition of the pitch into separate fractions. Such approach, to study the physicochemical characteristics of the individual components of coal tar pitch, contributes to both the determination of the contribution of individual pitch components to the process of its structuring during carbonization and the development of new environmentally friendly methods for the synthesis of functional materials for various applications. The β-fraction was precipitated with n-hexane from toluene extract of coal tar pitch. γ-fraction was isolated from n-hexane by solvent evaporation. α2-fraction was isolated from the residue, insoluble in toluene, by quinoline extraction. The composition and structure of the isolated individual fractions of coal tar pitch were studied by physicochemical methods of analysis. The shape and morphology were investigated by electron microscopy. To study the composition and structure, the methods of elemental analysis, infrared spectroscopy, electron-paramagnetic resonance, XRD-analysis, and thermoanalysis were used in combination with methods of derivative analysis, chromatography, and mass spectrometry. The authors of the work propose new approaches to the use of individual fractions of coal tar pitch in order to obtain new graphite-like materials on their basis.

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