The difference between vitrinite and inertinite in coal has been regarded as the starting point, and the vitrinite and inertinite stripped from a coal sample were conducted by high-temperature (600 °C and 900 °C) and high-pressure (1.0, 1.5, and 2.0 GPa) experiments. The samples' molecular structure was examined with element analysis, Fourier-transform infrared spectroscopy, and X-ray diffraction. The results reveal that pressure has an inhibitory effect on the evolution of molecular structure at 600 °C, and the vitrinite shows a lower molecular structure evolution degree than inertinite. For the two macerals at 900 °C, with increasing pressure, the molecular structure parameters exhibit opposite regularities to those at 600 °C, and the vitrinite shows a higher molecular structure evolution degree than inertinite. The evolution rate of molecular structures caused by pressure in vitrinite remains consistent under different temperature conditions, whereas that in inertinite exhibits jumping changes. There must be a transition interval between 600 °C and 900 °C that can change the pressure from inhibiting coalification to promoting coalification. When the temperature exceeds the transition interval, pressure can accelerate the molecular structure evolution in vitrinite, causing it to catch up with and surpass the evolution degree of inertinite's molecular structure.

中文翻译：

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压力对分子演化的影响：煤中镜质组和惰质组的差异

以煤中镜质组和惰质组的差异为出发点，通过高温（600℃和900℃）和高压（1.0、1.5、和2.0 GPa）实验。通过元素分析、傅里叶变换红外光谱和 X 射线衍射检查了样品的分子结构。结果表明，600 ℃时压力对分子结构演化具有抑制作用，镜质体的分子结构演化程度低于惰质体。对于900 ℃下的两种显微组分，随着压力的增加，分子结构参数表现出与600 ℃下相反的规律性，且镜质体比惰质体表现出更高的分子结构演化程度。镜质体中压力引起的分子结构演化速率在不同温度条件下保持一致，而惰性体中的分子结构演化速率则呈现跳跃性变化。 600℃到900℃之间必须有一个可以将抑制煤化压力转变为促进煤化压力的过渡区间。当温度超过转变区间时，压力可以加速镜质体分子结构的演化，使其赶上并超过惰性体分子结构的演化程度。