Heat treatment of medium-temperature Sasol–Lurgi gasifier coal-tar pitch for polymerizing to higher value products

Mokoena, K.; Walt, T.J. van der; Morgan, Trevor; Herod, Alan A.; Kandiyoti, R.

doi:10.1016/j.fuel.2007.05.006

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…Nevertheless, it should be noted that heating time longer than 1 h does not result to a significant change of H/C ratio nor Iar value, suggesting that 1 h or less is probably the most optimum parameter. These results are consistent with Mokoena et al which have shown that prolonged heat treatment of gasification pitch only leads to coke formation [6]. Compared to Mokoena et al result, the aromaticity index in this study is slightly higher than that of pressurized Sasol-Lurgi pitch having an average value of 0.27.…”

Section: Resultssupporting

confidence: 91%

“…Therefore it can be concluded that longer heating time promotes higher aromatization.This is because prolonged heat-treatment assists Polycyclic Aromatic Hydrocarbon (PAH) groups to form cross-link between molecules, resulting in larger molecules. The reaction routes proposed in the literature [6] suggest that both of cross-link and condensation reactions may take part during heat treatment. However, in this case, the crosslink reaction should be the dominant reactions.…”

Section: Resultsmentioning

confidence: 99%

“…The previous study showed that there are several attempts to produce anode grade CTP from coal gasification pitch [5][6][7][8][9]. However, the lack of understanding of pitch composition and heterogeneous composition of the raw pitch, make there is no single rule of thumb for all pitches production.…”

Section: Introductionmentioning

confidence: 99%

“…Mokoena et al showed that gasification pitch alone could not be a substitute for the more aromatic hightemperature pitch because more intense heat treatment will only lead it to coke formation [6]. However, blending with a good understanding of the development of the pitches might provide a good binder pitch material.…”

Section: Introductionmentioning

confidence: 99%

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Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Phiciato¹,

Monika²,

Hardian

2018

Indones. J. Chem.

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A medium temperature pitch obtained from atmospheric fixed-bed gasifier was distilled at a various time (1, 2, 3 and 4 h) 27). ABSTRAK Pitch suhu medium yang diperoleh dari gasifikasi batubara tipe fixed-bed, didestilasi pada berbagai variasi waktu (1, 2, 3 dan 4 jam) untuk memicu polimerisasi dan kemudian hasilnya dibandingkan dengan pitch ter batubara komersial (CTP). Tingkat aromatisitas pitch dievaluasi dengan menggunakan spektroskopi inframerah, analisis unsur dan analisis termogravimetri simultan (TG-DSC

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Phiciato¹,

Monika²,

Hardian

2018

Indones. J. Chem.

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“…The aromaticity index (f a ) values reported in Table 1 were estimated from the 13 C n.m.r. spectra using the technique proposed by Mokoena et al [22] that corrects for the influence of these spinning sidebands. This index provides a semi-quantitative measure of the aromaticity of pitches [22,23] suitable for comparing trends.…”

Section: Characterization Of Pitch Fractions From Reflux Extractionsmentioning

confidence: 99%

Characterization of medium-temperature Sasol–Lurgi gasifier coal tar pitch

Papole

Focke

Manyala

2012

Fuel

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Medium-temperature gasifier pitch (MTP) is only partly soluble in acetonitrile, methanol and ethanol. Single-stage pitch extraction with a large quantity of methanol yielded two liquid phases containing 76 wt. % and 27 wt. % pitch respectively. The pitch fractions recovered from these two phases featured similar aromaticity indices. However, the pitch from the pitch-rich phase had a higher average molar mass and gave an improved carbon yield at 1000°C. Analysis of the methanol-insoluble pitch fraction showed that methanol extraction at reflux temperatures effectively removed boronic acid model compounds from pitch samples spiked with the same.

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Defect‐Induced Electron Redistribution between Pt‐N₃S₁ Single Atomic Sites and Pt Clusters for Synergistic Electrocatalytic Hydrogen Production with Ultra‐High Mass Activity

Wang,

Feng,

et al. 2023

Adv Funct Materials

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A N, S co‐doped carbon with abundant vacancy defects (NSC) anchored Pt single atoms (SAs) and nanoclusters (NCs) derived from coal pitch by a self‐assembly‐pyrolysis strategy is reported and a defect‐induced electron redistribution effect based on Pt SAs‐Pt NCs/NSC catalyst is proposed for electrocatalytic hydrogen evolution reaction (HER). The optimized catalyst featuring Pt‐N3S1 SAs and Pt NCs dual active sites exhibit excellent HER activity with an overpotential of 192 mV at a current density of 400 mA cm−2, a turnover frequency of 30.1 s−1 at an overpotential of 150 mV, which the mass activity is 13716 mA mgPt−1, 7.4 times higher than that of 20% Pt/C catalyst. In situ Raman revealsa direct correlation between the defect structure of the catalyst and hydrogen adsorption during the reaction process. Density functional theory calculation shows the defect‐induced electron redistribution between Pt‐N3S1 SAs and Pt NCs. The electrons are transferred from Pt NCs to Pt SAs, which increases the number of electrons on the surface of Pt SAs and enhances the adsorption ability of H+. Meanwhile, the dissociation ability of H* on the Pt NCs is promoted, thus synergistically promoting the HER process.

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Heat treatment of medium-temperature Sasol–Lurgi gasifier coal-tar pitch for polymerizing to higher value products

Cited by 16 publications

References 16 publications

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Characterization of medium-temperature Sasol–Lurgi gasifier coal tar pitch

Defect‐Induced Electron Redistribution between Pt‐N₃S₁ Single Atomic Sites and Pt Clusters for Synergistic Electrocatalytic Hydrogen Production with Ultra‐High Mass Activity

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Heat treatment of medium-temperature Sasol–Lurgi gasifier coal-tar pitch for polymerizing to higher value products

Cited by 16 publications

References 16 publications

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Heat Treatment of Pitch Obtained from Atmospheric Fixed-Bed Coal Gasification

Characterization of medium-temperature Sasol–Lurgi gasifier coal tar pitch

Defect‐Induced Electron Redistribution between Pt‐N3S1 Single Atomic Sites and Pt Clusters for Synergistic Electrocatalytic Hydrogen Production with Ultra‐High Mass Activity

Contact Info

Product

Resources

About

Defect‐Induced Electron Redistribution between Pt‐N₃S₁ Single Atomic Sites and Pt Clusters for Synergistic Electrocatalytic Hydrogen Production with Ultra‐High Mass Activity