Accidental leakage and/or spillage of crude oil contaminates soil occurring during petroleum extraction, which can have harmful effects both on the environment and human beings. Therefore, petroleum-contaminated soil needs to be effectively decontaminated. As a study of thermal remediation of petroleum-contaminated soil, a real soil sample contaminated with petroleum was pyrolyzed at different pyrolysis conditions. In particular, carbon dioxide (CO₂) was used as the pyrolysis medium for effective thermal remediation of the petroleum-contaminated soil. At temperatures above 620 °C, pyrolytic gas evolution patterns obtained in CO₂ condition were distinguishable from those obtained in N₂ condition; the generation of carbon monoxide (CO) was observed. The formation of CO at temperatures higher than 620 °C might be a clue about the role of CO₂ in pyrolysis of the petroleum-contaminated soil in that CO₂ helps form CO via reactions between CO₂ and volatile species evolved from the petroleum hydrocarbons deposited on the soil during the pyrolysis. For further investigating the effect of CO₂ on the pyrolysis, two-stage pyrolysis of the petroleum-contaminated soil was conducted. The CO evolution also occurred in the CO₂ condition during the two-stage pyrolysis at >210 °C. The different compositions of pyrolytic oil obtained from the pyrolysis in N₂ and CO₂ were identified in that the formation of polycyclic aromatic hydrocarbons was restricted by the consuming the source of carbon. The pyrolysis operated under CO₂ atmosphere would be an effective decontamination method to treat petroleum-contaminated soil.

原油的意外泄漏和/或泄漏会污染石油开采过程中发生的土壤，这可能对环境和人类造成有害影响。因此，需要对石油污染的土壤进行有效的净化。作为对石油污染土壤进行热修复的研究，在不同的热解条件下，将被石油污染的真实土壤样品进行热解。特别地，将二氧化碳（CO ₂）用作热解介质，以有效地热修复石油污染的土壤。在高于620°C的温度下，在CO ₂条件下获得的热解气体逸出模式与在N _2中获得的有区别。健康）状况; 观察到一氧化碳（CO）的产生。在高于620°C的温度下形成CO可能是关于CO ₂在石油污染的土壤热解中的作用的线索，因为CO ₂有助于通过CO ₂与从沉积的石油烃中释放出来的挥发性物质之间的反应形成CO在热解过程中的土壤上。为了进一步研究CO ₂对热解的影响，对石油污染土壤进行了两阶段热解。在> 210°C的两阶段热解过程中，CO释放也发生在CO ₂条件下。N ₂和CO ₂中热解制得的热解油的不同组成经鉴定，多环芳烃的形成受到碳源消耗的限制。在CO ₂气氛下进行的热解将是一种有效的去污方法，用于处理石油污染的土壤。