Abstract
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.
Highlights
Coal tar pitch (CTP) is a by-product of coal coking
Research has shown that air oxidation is more beneficial oxidation, which may caused by dehydrogenation condensation of oligomers and esAs shown inofTable thecoking volatile (V)CTP
The use of air catalytic oxidation CTP significantly reduces the emission of polycyclic aromatic hydrocarbons (PAHs) during the the co-carbonization process, which is of great meaningful results for environmental polCatalysts 2021, 11, x FOR PEER REVIEW
Summary
Coal tar pitch (CTP) is a by-product of coal coking. it has a good affinity with coal and can effectively improve the coke quality as a binder. When the asphalt reacts with oxygen, its molecular polarity changes, causing a decrease in aromatics, saturates, and resins, and an increase in asphaltenes, reducing the thermal sensitivity and ductility. Ayoe Benk [9] stated that the improvement in the quality of asphalt as a binder is due to the increase in asphaltene by the action of oxygen in the air, high-strength coal with a tensile strength of 50.45 NM/m2 was obtained using air-oxidized CTP blended with phenolic resin as a coal binder and cured at 200 ◦ C for 5 h. When AlCl3 is used as a catalyst, HCl, olefins and aromatics can undergo alkylation reactions, which proceed as in Scheme 1 [38]. The effect[39,40]
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