The combined effects of surface area, pore structure, degree of graphitization, and number of carbon functional groups on the gasification kinetics of tri-high coal char prepared at an elevated temperature were studied by a thermogravimetric analyzer and various characterization methods [scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) theory, X-ray diffraction (XRD), Raman spectroscopy, and Fourier transfer infrared spectroscopy]. In the kinetic analysis, the CO2 gasification of high-ash coal was not adequately described by the random pore model because ash influenced the char structure during pyrolysis and gasification. Meanwhile, the SEM and BET results indicated the promotion of micropore formation and mesopore expansion of the coal char during pyrolysis. The XRD, Raman, and FTIR results evidenced a significant increase of large aromatic groups during the pyrolysis process, attributable to the cracking of aliphatic groups and the polycondensation of the cracking residues. Overall, the porous structure and aromatic groups of coal char developed during the pyrolysis process improved the CO2 gasification kinetics of the tri-high coal char.

中文翻译：

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高温下制备的三高煤焦的CO2气化动力学和结构特征。

用热重分析仪和各种表征方法研究了表面积，孔结构，石墨化程度和碳官能团数量对高温制备的三高煤焦气化动力学的综合影响。 SEM），Brunauer-Emmett-Teller（BET）理论，X射线衍射（XRD），拉曼光谱和傅里叶转移红外光谱]。在动力学分析中，随机灰孔模型无法充分描述高灰分煤的CO2气化，因为灰分会影响热解和气化过程中的焦炭结构。同时，SEM和BET结果表明热解过程中煤焦的微孔形成和中孔膨胀的促进。XRD拉曼 FTIR结果表明，在热解过程中，较大的芳族基团显着增加，这归因于脂肪族基团的裂解和裂解残余物的缩聚反应。总体而言，在热解过程中形成的煤焦的多孔结构和芳族基团改善了三高煤焦的CO2气化动力学。