Mechanisms and characteristics of mesocarbon microbeads prepared by co-carbonization of coal tar pitch and direct coal liquefaction residue  

作　　者：Bingfeng Yan Guangyao Wang 

机构地区：[1]State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China [2]Beijing Research Institute of Coal Chemistry,China Coal Research Institute,Beijing 100013,China

出　　处：《International Journal of Coal Science & Technology》2019年第4期633-642,共10页国际煤炭科学技术学报（英文）

基　　金：Supported by National Key Research and Development Program of China(2018YFB0604601)and the Technology Innovation Fund of China coal research institute(2016CX01).

摘　　要：DCLR-P was prepared by direct coal liquefaction residue (DCLR) with ash removal.In the present experiments,mesocarbon microbeads (MCMBs) were prepared by co-carbonization of coal tar pitch (CTP) and DCLR-P.With the increase of DCLR-P content,the yield of MCMBs increased from 47.8% to 56.8%.At the same time,the particle sizes distribution of MCMBs was narrowed,resulting in the decrease of D9o/D10 ratio from 154.88 to 6.53.The results showed that DCLR-P had a positive effect on the preparation of MCMBs.1H-NMR,FTIR,SEM and XRD were used to analyze the mechanisms and characteristics of MCMBs prepared by co-carbonization of CTP and DCLR-P.The results showed that the Proton Donor Quality Index (PDQI) of DCLR-P was 13.32,significantly higher than that of CTP (0.83).This indicated that DCLR-P had more naphthenic structure than CTP,which leads to hydrogen transferring in polycondensation reaction.The aliphatic structure of DCLR-P can improve the solubility and fusibility of mesophase,thereby making the structure of MCMBs more structured.The microstructure of the graphitized MCMBs had a substantially parallel carbon layer useful for its electrical performance.The performance of graphitized MCMBs as a negative electrode material for Li-ion batteries was tested.The particle sizes,tap density,specific surface area and initial charge-discharge efficiency of graphitized MCMBs met the requirements of CMB-I in GB/T-24533-2009.However,the initial discharge capacity of graphitized MCMB was only 296.3 mA h g-1 due to the low degree of graphitization of MCMBs.

关 键 词：Mesocarbon MICROBEADS Direct coal LIQUEFACTION RESIDUE MECHANISMS CHARACTERISTICS 

分 类 号：TS8[轻工技术与工程]