热解是褐煤改性提质的重要手段，为研究不同热解温度制取褐煤焦的物相和微结构变化，采集沈北矿区蒲河煤矿褐煤煤样，选取低中高（400 ℃、700 ℃、1000 ℃）三个热解特征温度制取褐煤焦样，通过SEM、XRD、Raman、FT-IR、XPS、低温N2吸附实验，对褐煤焦样的物化结构进行分析。结果表明：热解温度提高，焦样芳香性增强，含氧官能团O-H、C=O、C-O大幅减少，表面含碳官能团，C-C结构增加，C-H结构减少；400 ℃和700 ℃焦样微晶结构缺陷增加，1000 ℃焦样微晶结构趋于有序并向石墨化转变；焦样比表面积和孔容积随热解温度提高先增大后减小，700 ℃焦样拥有最大的比表面积（117.0637 m2/g）和孔容积（0.068134 cm3/g），提高热解温度有利于焦样微孔结构发育。

Pyrolysis is an important means of lignite modification and upgrading. In order to study the changes of phase and microstructure of lignite char prepared at different pyrolysis temperatures, lignite samples from Puhe coal mine in Shenbei mining area, were pyrolyzed at three pyrolysis characteristic temperatures (400 ℃,700 ℃ ,1000 ℃) to prepare lignite char samples. The physicochemical structure of lignite coke samples was analyzed by SEM, XRD, Raman, FT-IR, XPS, N2 adsorption experiments. The results show that with the increase of pyrolysis temperature, the aromaticity of coke sample is enhanced, the oxygen-containing functional groups O-H, C=O and C-O of coke sample are greatly reduced, surface carbonaceous functional groups, the intensity of C-C increased and the intensity of C-H reduced. At 400 ℃ and 700 ℃, the microcrystalline structure defects of coke samples increased, while at 1000 ℃, the microcrystalline structure of coke sample tends to order and changes to graphitization. The specific surface area and pore volume of coke samples first increased and then decreased with the increase of pyrolysis temperature. 700 ℃ coke sample has the largest specific surface area (117.0637 m2/g) and pore volume (0.068134 cm3/g). Increasing pyrolysis temperature is conducive to the development of microporous structure of coke sample.

国家自然科学基金项目（面上项目，重点项目，重大项目）