Preparation and Characterization of Mesocarbon Microbeads by the Co-Polycondensation of High-Temperature Coal Tar Pitch and Coal Pyrolytic Extracts

Abstract

Mesocarbon microbeads (MCMBs) are a kind of engineering and functional artificial carbon materials generally prepared by the polymerization of polycyclic aromatic hydrocarbons. The physicochemical property of the raw materials plays a key role in the quality of MCMBs. For a detailed analysis of the synergistic effects of the generation of MCMBs, a high-temperature coal tar pitch was used as raw materials, and coal pyrolytic extracts were used as additive to synthesize the MCMBs. The microstructure and morphology of the derived MCMBs were determined by an optical microscope, scanning electron microscope, X-ray diffraction, Raman spectrum, and laser particle size analyzer. In fact, the addition of the coal pyrolytic extracts can adjust the molecular structure of the blending pitch, and the coal pyrolytic extracts can promote the generation of the MCMBs during the co-polycondensation process. The MCMBs obtained by co-polycondensation method have a good degree of sphericity, lower defects in the surface morphology, and a lower charge transfer resistance (Rct) of 4.677 Ω.

Synthesis of mesocarbon microbeads from high‐temperature coal tar pitch: Effects of quinoline insoluble

“…In order to characterize the uniformity of particle size distribution, uniformity index of particle size (PUI) was used. 12 The information of the particle size of derived MCMBs was presented in Table 2.…”

“…However, the yield, particle size, degree of sphericity, and uniformity of particle size were restricted the application and properties of MCMB. 11,12 More and more researchers take more attentions on the raw pitches to produce high quality MCMB. Thus, varied pitches and coal tar or their blends have been used as raw materials to produce MCMB.…”

“…15 Yan et al have prepared the MCMB with the smooth surface by the co-polymerization of medium coal tar pitch and coal pyrolytic extracts. 12 The distribution of pitch molecular structure and functional groups can affect the reaction degree during the thermal polymerization process and then affect the quality of derived MCMB. 16 Factually, the moderate content of primary quinoline insoluble was the precondition for coal tar pitch to produce MCMB by thermal polymerization method.…”

“…It was a mature technology to produce MCMB by thermal‐polymerization method with high‐temperature coal tar pitch as raw materials. However, the yield, particle size, degree of sphericity, and uniformity of particle size were restricted the application and properties of MCMB 11,12 …”

“…Yan et al have generated the MCMB with the coal direct liquefaction pitch as the principal raw material and the coal tar pitch or anthracene oil as the additive by the co‐carbonization method 15 . Yan et al have prepared the MCMB with the smooth surface by the co‐polymerization of medium coal tar pitch and coal pyrolytic extracts 12 . The distribution of pitch molecular structure and functional groups can affect the reaction degree during the thermal polymerization process and then affect the quality of derived MCMB 16 .…”