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

Chen, Liqing; Guo, Fanhui; Wu, Jianjun; Li, Ping; Zhang, Yixin

doi:10.3390/catal11121428

Cited by 6 publications

(5 citation statements)

References 54 publications

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“…In addition, increased intensity of FT-IR signals were also observed at 2860 and 2930 cm −1 , which can be indexed to the cyclohexane bands [ 82 ]. These results are in good agreement with the benzaldehyde ( m / z = 106) and dimethylcyclohexane ( m / z = 112) products recorded by GC-MS ( Table 3 ) [ 83 ]. It should be noted that the conversion rates based on GC-MS are slightly higher than that of UV-vis DRS, since some side products might not be reflected by absorption spectra.…”

Section: Resultssupporting

confidence: 88%

Carbon Quantum Dots Bridged TiO2/CdIn2S4 toward Photocatalytic Upgrading of Polycyclic Aromatic Hydrocarbons to Benzaldehyde

et al. 2022

Molecules

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Conversion of hazardous compounds to value-added chemicals using clean energy possesses massive industrial interest. This applies especially to the hazardous compounds that are frequently released in daily life. In this work, a S-scheme photocatalyst is optimized by rational loading of carbon quantum dots (CQDs) during the synthetic process. As a bridge, the presence of CQDs between TiO2 and CdIn2S4 improves the electron extraction from TiO2 and supports the charge transport in S-scheme. Thanks to this, the TiO2/CQDs/CdIn2S4 presents outstanding photoactivity in converting the polycyclic aromatic hydrocarbons (PAHs) released by cigarette to value-added benzaldehyde. The optimized photocatalyst performs 87.79% conversion rate and 72.76% selectivity in 1 h reaction under a simulated solar source, as confirmed by FT-IR and GC-MS. A combination of experiments and theoretical calculations are conducted to demonstrate the role of CQDs in TiO2/CQDs/CdIn2S4 toward photocatalysis.

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Section: Resultssupporting

confidence: 88%

Carbon Quantum Dots Bridged TiO2/CdIn2S4 toward Photocatalytic Upgrading of Polycyclic Aromatic Hydrocarbons to Benzaldehyde

et al. 2022

Molecules

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“…The spectrum of all samples had strong bands between 3000 and 2800 cm –1 , as shown in Figure a–f. At 2920 and 2850 cm –1 , the stretching vibration peak of aliphatic C–H and the antisymmetric stretching vibration peak of saturated C–H on methyl (−CH 3 ) were respectively, and the stability of the peak indicated that the aliphatic content had not increased …”

Section: Results and Discussionmentioning

confidence: 99%

“…At 2920 and 2850 cm −1 , the stretching vibration peak of aliphatic C−H and the antisymmetric stretching vibration peak of saturated C−H on methyl (−CH 3 ) were respectively, 15 and the stability of the peak indicated that the aliphatic content had not increased. 16 3. 17 The range of 1620−1500 cm −1 represents the C�C tensile vibration peak.…”

Section: Ftir Analysis Of Heavy Coal Tar Cut By Different Fractions 3...mentioning

confidence: 99%

Infrared Spectrum and Principal Component Analysis of Heavy Tar Cut by Different Fractions from Tar-Rich Coal

Zhang,

Xue,

Shu

2023

ACS Omega

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The composition and content of heavy tar vary significantly depending on the pyrolysis conditions and separation methods. This study aimed to effectively identify the main components and content of heavy coal tar and provide a theoretical basis for its subsequent utilization. To achieve this, simulated distillation and infrared spectrum analysis of heavy coal tar were conducted with a focus on understanding the impact of simulated distillation on the composition and structure of tar. The results showed that the fraction content in the tar underwent significant changes after simulated distillation at different temperatures. Specifically, the content of light oil decreased from 4.3 to 0.1%, while the asphalt content increased from 77.6 to 90.6%. Infrared spectrum and peak fitting revealed that the distilled coal tars exhibited similar characteristic peaks in regions associated with hydroxyl, aliphatic hydrocarbon, oxygen-containing functional group, and aromatic hydrocarbon structure. Based on the infrared spectrum of heavy coal tar, principal component analysis was conducted on different fractions. When using two principal components, the cumulative value reached 96.93%. It was found that PC1 displayed strong peak signals around 749 and 687 cm −1 , while PC2 exhibited strong peak signals near 2356 and 1143 cm −1 .

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“…During baking, the pitch carbonizes, which binds the coke particles together. However, the quality and availability of anode-grade raw materials have decreased. − …”

Section: Introductionmentioning

confidence: 99%

Impact of Pitch Modification on Anode Properties: Effect of Additive Type

et al. 2023

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Aluminum is one of the major industries in Canada. The main challenges facing the aluminum industry are carbon loss, energy use, greenhouse gas emissions, cell performance, and production costs, especially for high-amperage cells. The quality of carbon anodes plays a major role in the stability of cell operation and energy consumption. Anodes are made from petroleum coke, rejected green and baked anodes and butts, as well as coal tar pitch, which binds all of the particles. Although the industry depends on a steady supply of high-quality anodes, the availability of quality anode raw materials�coke and pitch�has decreased. A means of improving raw material quality is to modify their properties. In this work, using two additives, low-and high-quinoline insoluble (LQI and HQI) pitches were modified. These additives enrich the surface functional groups of the pitch, thereby increasing coke−pitch interactions. Various additive concentrations and pitch percentages were assessed. It is found that the choice of additive type has a marked effect on pitch properties, with different additives improving different pitches. Additive 1 is suitable for the HQI pitch, whereas additive 2 modifies the LQI pitch better. Anode properties are improved by modifying one of the pitches, whereas modifying the other pitch affects the anode quality to a lesser extent. Thus, the results showed that the modification of an already good-quality pitch (LQI pitch) does not significantly affect the anode quality. On the other hand, the modification of the inferior-quality pitch (HQI pitch) improved the anode quality and decreased the optimum pitch percentage necessary to obtain good anodes compared to the percentage of the LQI pitch needed. This would help decrease the anode production cost. The wettability tests give an indication of if the additive has the potential to improve the coke−pitch interactions, but it cannot predict the effect of pitch percent.

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

Cited by 6 publications

References 54 publications

Carbon Quantum Dots Bridged TiO2/CdIn2S4 toward Photocatalytic Upgrading of Polycyclic Aromatic Hydrocarbons to Benzaldehyde

Carbon Quantum Dots Bridged TiO2/CdIn2S4 toward Photocatalytic Upgrading of Polycyclic Aromatic Hydrocarbons to Benzaldehyde

Infrared Spectrum and Principal Component Analysis of Heavy Tar Cut by Different Fractions from Tar-Rich Coal

Impact of Pitch Modification on Anode Properties: Effect of Additive Type

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