In order to describe pyrolysis characterization of Estonia oil shale kerogen, electron paramagnetic resonance ( EPR) was carried out to analyze influence of pyrolysis temperature on free radical concentration, g factors and line width (△H) of Estonia kerogen and its pyrolysates. The results show that range of free radical concentration of Estonia oil shale and its pyrolysis oil, thermal bitumen and semi-coke is between 2. 29×1014 and 9. 16×1014. The free radical concentration and g factor of thermal bitumen is higher than that of semi-coke. The thermal depolymerization of kerogen mainly occurs before 380 ℃ and intermediate thermal bitumen mainly decomposes above 380℃. The line width of the samples shows that△H of shale oil is much higher than that of semi-coke and thermal bitumen at higher pyrolysis temperature. It means that the interaction between spin particles in free radicals and the interaction between the spin particles and environment in liquids are much more severe than solid samples. Below 380 ℃, △H of thermal bitumen and semi-coke increases with rising temperature. The interaction between the spin particles and environment was enhanced with pyrolysis proceeding. Above 380℃,△H of thermal bitumen and semi-coke decrease, indicating that the interaction between the spin particles is weaken with the rising temperature.%采用电子顺磁共振(EPR)技术,系统地研究了热解温度对样品自由基浓度、g因子和线宽的影响.结果表明,油页岩干酪根及其制备的热解产物沥青、焦油和半焦的自由基浓度为2.29×1014-9.16×1014.当热解温度低于380℃时,主要发生干酪根的热解聚,当热解温度超过380℃,主要为中间产物热沥青的分解阶段,表现为热沥青的自由基浓度Ng和g因子值高于半焦.对EPR谱图线宽分析可知,当温度高于380℃时,焦油的线宽明显大于半焦和热沥青,说明液体内部自由基中自旋粒子间以及自旋粒子与环境的相互作用要比固体剧烈的多.温度低于380℃时,半焦和热沥青由于热解反应的进行,自由基自旋粒子之间及其与环境的相互作用增强,线宽随着温度的升高而增加.温度高于380℃时,半焦和热沥青的EPR曲线线宽降低,表明随着温度的升高自由基自旋粒子的相互作用减弱.
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