Analysis of coal tar derived from pyrolysis at different atmospheres

Wang, Pengfei; Jin, Lijun; Liu, Jiahe; Zhu, Shengwei; Hu, Haoquan

doi:10.1016/j.fuel.2010.06.041

Cited by 165 publications

(75 citation statements)

References 27 publications

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“…Prior to deconvolution, the 13 C-NMR spectrum was adjusted using the Nuts Software. Then, the PFM module of the Origin Software was used to subtract the baseline, add peaks manually according to the spectrum shape and assignment of NMR structure The chemical shifts and assignment for the 13 C-NMR spectra of coal and its precursor have been summarized in previous studies [57][58][59][60][79][80][81][82][83][84][85], and the reported chemical shifts are mostly identical with only minor differences. The 13 C-NMR structure parameters and assignment used in the present study are given in Table 2 [84,[86][87][88].…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

Wei

Tang

2018

Minerals

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Abstract:The structure evolution characteristics of high-organic-sulfur (HOS) coals with a wide range of ranks from typical Chinese areas were investigated using 13 C-CP/MAS NMR. The results indicate that the structure parameters that are relevant to coal rank include CH 3 carbon (f al *), quaternary carbon, CH/CH 2 carbon + quaternary carbon (f al H ), aliphatic carbon (f al C ), protonated aromatic carbon (f a H ), protonated aromatic carbon + aromatic bridgehead carbon (f a H+B ), aromaticity (f a CP ), and aromatic carbon (f ar C ). The coal structure changed dramatically in the first two coalification jumps, especially the first one. A large number of aromatic structures condensed, and aliphatic structures rapidly developed at the initial stage of bituminous coal accompanied by remarkable decarboxylation. Compared to ordinary coals, the structure evolution characteristics of HOS coals manifest in three ways: First, the aromatic CH 3 carbon, alkylated aromatic carbon (f a S ), aromatic bridgehead carbon (f a B ), and phenolic ether (f a P ) are barely relevant to rank, and abundant organic sulfur has an impact on the normal evolution process of coal. Second, the average aromatic cluster sizes of some super-high-organic-sulfur (SHOS) coals are not large, and the extensive development of cross bonds and/or bridged bonds form closer connections among the aromatic fringes. Moreover, sulfur-containing functional groups are probably significant components in these linkages. Third, a considerable portion of "oxygen-containing functional groups" in SHOS coals determined by 13 C-NMR are actually sulfur-containing groups, which results in the anomaly that the oxygen-containing structures increase with coal rank.

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Section: Samples and Analytical Methodsmentioning

confidence: 99%

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

Wei

Tang

2018

Minerals

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“…From these reasons, HPC has very different characteristics from coal tar. Coal tar, which is coal pyrolysed by-product at over 800°C, usually has characteristics such as molecular compositions of relatively low heterogeneous atoms, high aromaticity, 3~4 condensed aromatic ring compounds, relatively small molecular weight distribution, almost no double bond compounds, and almost no 5 membered aromatic ring compounds [15]. However, HPC, which is a coal extracted one at less than 400°C, usually has characteristics of molecular compositions of relatively high heterogeneous atoms (O, N), high aliphatic contents, broad compositions of 1~ 8 condensed aromatic ring compounds, relatively large molecular weight distribution, some amounts of double or triple bond compounds, and some amounts of 5 membered aromatic ring compounds [16].…”

Section: Of 10mentioning

confidence: 99%

Improving Spinnability of Hyper-coal Derived Spinnable Pitch through the Hydrogenation with 1, 2, 3, 4-tetrahydroquinoline

Yang¹,

Wu²,

Zhang³

et al. 2018

Preprint

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Abstract:The proper hydrogenation of Hyper-coal (HPC) using 1, 2, 3, 4-tetrahydroquinoline (THQ) was able to decrease the oxygen content and adjust the molecular structure of HPC for preparing the spinnable pitch with high softening point (SP). The spinnable pitch prepared from the THQsoluble (QS) fraction of HPC as a precursor consisted more naphthenic carbon groups than that prepared from the 1-methylnaphthalene (1-MN) soluble (MNS) fraction of HPC. The HPC-QS derived spinnable pitch showed excellent spinning performance even the SP of 260°C, and the tensile strength of the resultant carbon fiber was increased to 1350 MPa with a diameter around 8 µm under the only carbonization temperature of at 800°C for 5 min.

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“…El análisis de la cinética química de la etapa de pirólisis puede ser expresada como función de una energía de activación del proceso, generalmente evaluada mediante métodos termogravimétricos con velocidades de calentamiento entre 2 y 5⁰C/min [42] y a diferentes presiones [43]. De igual forma algunos autores plantean la existencia de modelos sencillos para la evaluación de la cinética de la etapa de pirólisis basados en la separación de las ciné-ticas del proceso de secado y de pirólisis, tomado únicamente en cuenta la degradación de todo el sólido más no la descomposición de los principales componentes como lo son la celulosa, hemicelulosa y lignina [44].…”

Section: A Estudios De La Cinética Para La Etapa De Pirólisisunclassified

Producción y uso de pellets de biomasa para la generación de energía térmica: una revisión a los modelos del proceso de gasificación

Núñez¹,

Fajardo²,

Vargas³

2012

Iteckne

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Analysis of coal tar derived from pyrolysis at different atmospheres

Cited by 165 publications

References 27 publications

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

Improving Spinnability of Hyper-coal Derived Spinnable Pitch through the Hydrogenation with 1, 2, 3, 4-tetrahydroquinoline

Producción y uso de pellets de biomasa para la generación de energía térmica: una revisión a los modelos del proceso de gasificación

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