喹啉沥青的合成及其富氮衍生炭的微观结构研究

doi:10.11896/cldb.20120072

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Abstract Nitrogen-rich carbon materialas a functional material with excellent performance has broad application prospects in chemical catalysis, adsorption and separation, electrode materials, hydrogen storage, dye wastewater treatment and other fields. Recently, nitrogen-rich pitch as an excellent nitrogen-rich precursor has been favored by many researchers because of its rich raw materials, relatively simple preparation method and easy mass production. In this work, four quinoline pitches were synthesized by self-rising pressure method using the nitrogen-containing mo-nomer quinoline as raw material and 5%(mass fraction) AlCl₃ as catalyst. The physicochemical properties of four QLPs were characterized by Fourier transform infrared spectroscopy, gel permeation chromatography and thermogravimetric analyzer. The change of nitrogen content and microstructure of quinoline pitch-derived carbon (CQLP) with carbonization temperature was studied by elemental analysis, polarized light microscopy (PLM), Raman spectroscopy and X-ray diffraction (XRD) technique. The results showed that the yield of the four QLPs was all about 90%, the softening point was around 120 ℃, the ash content was less than 2.5%, the mass average molecular weight was 360—390, and the number average molecular weight was 250—260. The aromatic index (I_ar) of the four QLPs was 0.55—0.69, the ortho-substitution index (I_os) was 0.52—0.72, the branched chain index (CH₃/CH₂) was 0.11—0.23, and the residual carbon yields at 750 ℃ were in the range of 29.0%—50.7%, depending on the synthesis conditions. The nitrogen content of QLP was 8.22%, and its nitrogen content increased first and then decreased slightly with the increase of carbonization temperature. The CQLP obtained at 750 ℃ had the highest nitrogen content of 9.70%. The microstructure of the three CQLPs carbon was mainly lamellar and fibrous textures, which account for about 50%—60% and 10%—30% respectively, showing good graphitization. With the increase of carbonization temperature, the carbon microcrystal size of CQLP increased, while the layer spacing decreased, but the regularity decreased.

Key words： nitrogen-rich carbon material quinoline pitch physicochemical properties microstructure

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TQ522.65

Fund:National Natural Science Foundation of China (U1361126) and the Natural Science Foundation of Liaoning Province (20180551218).

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	Articles by authors
	FAN Qingjie
	YANG Zijian
	LAI Shiquan
	YUE Li
	ZHU Yaming
	ZHAO Xuefei

Cite this article:

FAN Qingjie,YANG Zijian,LAI Shiquan, et al. Synthesis of Quinoline Pitch and Microstructures of Its Nitrogen-rich Derived Carbons[J]. Materials Reports, 2022, 36(4): 20120072-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20120072 OR http://www.mater-rep.com/EN/Y2022/V36/I4/20120072

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