Investigation on chemical and structural properties of coal- and petroleum-derived pitches and implications on physico-chemical properties (solubility, softening and coking)

Russo, Carmela; Ciajolo, A.; Stanzione, Fernando; Tregrossi, A.; Oliano, Maria Maddalena; Carpentieri, Andrea; Apicella, B.

doi:10.1016/j.fuel.2019.02.040

Cited by 47 publications

(34 citation statements)

References 44 publications

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“…Medium–low temperature coal tar pitch (MLP) is a type of large‐scale by‐product obtained during the production of semi‐coke and deep‐processing of low‐rank coal, respectively . MLP is usually used as the raw material for the production of liquefied oil, road asphalt, mesophase pitch, and other artificial carbon materials . The researchers believe that with the deep understanding of the physico‐chemical properties of MLP, it is a significantly important precursor to produce fine mosaic coke .…”

Section: Introductionmentioning

confidence: 99%

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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Medium–low temperature coal tar pitch (MLP) is a type of aromatic carbonaceous material obtained by the low temperature distillation of low rank coal, and is considered as a desirable raw material for the production of artificial carbon/graphite material. The thermal conversion behaviors of MLP during the liquid‐phase carbonization process were analyzed in detail in this study. Further, the changes of molecular structure and carbon microcrystalline structure of MLP and liquid‐phase carbonization products derived from it were quantitatively investigated by optical microscopy, fourier transform infrared spectroscopy, Raman spectroscopy, X‐ray diffraction, and curve‐fitting method. Results showed that both branched chain and the contents of C=O functional groups in the MLP played a key role in the reaction reactivity. Moreover, temperature of 450 °C was found to be a rapid changing temperature point on the enhancement of thermal conversion of MLP. The stacking height (Lc), parallel layers (N), average number of aromatic rings in each layer (n), ratio of ‘impurity’ structure (RI), ratio of amorphous carbon structure (RAC), ratio of graphite carbon structure (RGC), and ratio of defects graphite carbon structure (RDGC) exhibited a significant change with the improvement of liquid‐phase carbonization temperature.

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Section: Introductionmentioning

confidence: 99%

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Zhu

Zhao

et al. 2019

ChemistrySelect

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“…In Fig. 3 it can be seen that the PLL line has a slope of 0.704, which is lower with respect to the PLL slope typically evaluated for aromatic-rich samples like the flame-formed organic carbon (PLL slope= 0.8 [16]) and aromatic pitch (PLL slope=0.798, [14]). The PLL slope of asphaltenes is even lower than that evaluated for an aliphatic pitch (PLL slope 0.717 [14]), supporting the high aliphatic content in asphaltenes observed by FFT analysis above described.…”

Section: Figure 1 Ldi-tofms Spectrum Of Asphaltenes At Low Laser Power (40% Of Its Nominal Value)mentioning

confidence: 78%

“…In this work the DBE was determined for each mass peak considering the simplified formula for CxHy hydrocarbons: DBE = x-(y/2)+1 by an home-made software [14]. By plotting the DBE number and the relative intensity against the carbon number (CN), iso-abundance graphs were drawn in the Origin software.…”

Section: Laser Desorption Ionization-time Of Flight Mass Spectrometry (Ldi-tofms)mentioning

confidence: 99%

Characterization Techniques Coupled With Mathematical Tools for Deepening Asphaltenes Structure

Apicella¹,

Ciajolo²,

Carpentieri³

et al. 2021

Preprint

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Asphaltenes constitute a heavy fraction of fossil fuels and their characterization is still a very difficult and challenging issue due to their complex and variable composition. Asphaltene components are highly condensed aromatic molecules having some heteroatom and aliphatic functionalities. Their molecular weights distribution span a wide range, from hundreds to millions of units, in dependence on the diagnostic used, leading to speculation about possible occurrence of self-aggregation. In the present work, mass spectrometry, with properly developed mathematical methods, size ex-clusion chromatography and X-ray diffraction analysis have been applied to asphaltenes for giving some further insight on their MW distribution and characteristics. The results here reported give further quantitative support to the experimental data interpretation already reported in previous works.

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“…It has been accepted that the combination of Raman spectrum and curve‐fitted method was considered as the useful method to determine the distribution of carbon microcrystalline in varied needle cokes. Actually, the Raman spectrum graphs of calcinated needle cokes have been calculated by the Raman spectrum (LabRAM HR Evolution, JOBIN YVON, France), and the curve‐fitted standards were according to the literature 37 and our previous reports 3–5 . The affiliation of the bands in the Raman spectra has been presented in Table 1a.…”

Section: Methodsmentioning

confidence: 99%

Transformation of microstructure of coal‐based and petroleum‐based needle coke: Effects of calcination temperature

Zhu

et al. 2021

Asia-Pacific J Chem Eng

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Needle coke was recognized as one of the most important precursor to produce ultra‐high power graphite electrode, commercial anode materials for lithium‐ion battery, and special graphite materials. It was generally accepted that the microstructure of needle coke has been acted as a key role on the quality of its derived graphite materials. In this work, four kinds of green needle cokes (coal‐based green needle coke and petroleum‐based green needle coke) have been used as the raw materials to investigate the changes of micro‐structure during the calcination process. The micro‐structure of needle cokes at different calcination temperature has been detailed characterized by X‐ray diffraction (XRD), Raman spectrum, scanning electron microscope (SEM), and transmission electron microscopy (TEM), respectively. Briefly, the size of carbon crystalline (Lc), the content of graphite carbon (IG/IAll), and the content of regular carbon microcrystals (Ig) in coal‐based needle coke were higher than petroleum‐based needle coke when the calcinations temperature was below 1500°C. What's more, the calcinations temperature of 1400°C is the characteristic temperature of the transition of carbon microcrystalline. In other words, the coal‐based needle coke was easier to graphitization than petroleum‐based needle coke.

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Investigation on chemical and structural properties of coal- and petroleum-derived pitches and implications on physico-chemical properties (solubility, softening and coking)

Cited by 47 publications

References 44 publications

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Thermal Conversion Behavior of Medium–Low–Temperature Coal Tar Pitch During Liquid–Phase Carbonization Process

Characterization Techniques Coupled With Mathematical Tools for Deepening Asphaltenes Structure

Transformation of microstructure of coal‐based and petroleum‐based needle coke: Effects of calcination temperature

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