Abstract The structural evolution of SF-soot (derived from the rapid pyrolysis of ShenFu bituminous coal) and a carbon black (Printex) was performed for air oxidation at 1273 and 1473 K. The morphology and nanostructure transformations were examined at conversion fractions ~0.2, 0.4, 0.6, and 0.8. Three modes of behavior were evident. The behavior of SF-soot followed an internal oxidation model (IOM) at 1273 K. The oxygen was able to fully permeate into the particle core, producing a sphere with variable removal of the interior structure with conversion. However, at the higher temperature, the SF-soot formed a concentric spherical structure with gradual consumption of the inner sphere due to restricted oxygen penetration. The fragmentation of hollow interior particles, on which the available literature is not extensive, was observed from HRTEM and SEM micrographs for the first time. During the oxidation of SF-soot, micropores were mainly generated during the 0–0.2 conversion, while the mesopore surface rapidly increased during the 0.6–0.8 conversion. The X-ray diffraction (XRD) patterns and Raman spectra both show that the oxidation of SF-soot is mainly a disordering process. The graphitic microcrystals were mainly consumed along the longitudinal orientation during the 0–0.2 conversion but were mainly consumed along the horizontal during the 0.4–0.8 conversion. The true densities of SF-soot and carbon black initially increase and then decrease monotonically during oxidation.

中文翻译：

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高温空气氧化过程中煤源烟尘和炭黑的结构演化与破碎

摘要 SF-煤烟（源自神府烟煤的快速热解）和炭黑 (Printex) 的结构演变在 1273 和 1473 K 下进行空气氧化。在转化率 ~0.2 下检查形态和纳米结构转变， 0.4、0.6 和 0.8。三种行为模式很明显。SF-烟灰的行为遵循 1273 K 下的内部氧化模型 (IOM)。氧气能够完全渗透到粒子核心中，产生一个球体，内部结构随着转化率的变化而去除。然而，在较高温度下，由于氧气渗透受限，SF-烟灰形成同心球形结构，内球逐渐消耗。中空内部颗粒的破碎，现有文献并不广泛，首次从 HRTEM 和 SEM 显微照片中观察到。在SF-煤烟氧化过程中，微孔主要在0-0.2转化期间产生，而介孔表面在0.6-0.8转化期间迅速增加。X 射线衍射 (XRD) 图案和拉曼光谱均表明 SF-烟尘的氧化主要是一个无序过程。石墨微晶在 0-0.2 转换期间主要沿纵向消耗，但在 0.4-0.8 转换期间主要沿水平方向消耗。SF-烟灰和炭黑的真实密度在氧化过程中最初增加然后单调减少。6–0.8 转换。X 射线衍射 (XRD) 图案和拉曼光谱均表明 SF-烟尘的氧化主要是一个无序过程。石墨微晶在 0-0.2 转换期间主要沿纵向消耗，但在 0.4-0.8 转换期间主要沿水平方向消耗。SF-烟灰和炭黑的真实密度在氧化过程中最初增加然后单调减少。6–0.8 转换。X 射线衍射 (XRD) 图案和拉曼光谱均表明 SF-烟尘的氧化主要是一个无序过程。石墨微晶在 0-0.2 转换期间主要沿纵向消耗，但在 0.4-0.8 转换期间主要沿水平方向消耗。SF-烟灰和炭黑的真实密度在氧化过程中最初增加然后单调减少。