Abstract The catalytic effect of clay rocks as matrix for heavy oil combustion in in-situ combustion (ISC) process for enhanced oil recovery was investigated by thermogravimetric analyser coupled with Fourier Transform InfraRed spectroscopy (TG-FTIR) together with kinetic calculation using the Friedman, KAS, and Vyazovkin isoconversional methods. The results reveal that three types of clays show a good catalytic effect verified by a significant reduction in activation energy, mainly manifested as merging fuel deposition (FD) into high-temperature oxidation (HTO) and shifting the temperature peak of the low-temperature oxidation (LTO) and HTO into lower temperature. Mica-type clay shows the best catalytic activity among all the clay rocks. Clinochlore-talc-type clay shows a strong inhibition effect on the isomerization and decomposition reactions (in the later stage of the LTO) as well as the oxidative cracking reactions (in the FD stage), by which a bigger amount of unexpected coke is yielded, which thus significantly reduces combustion efficiency and shifts the HTO into a higher temperature range.

中文翻译：

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粘土岩作为天然催化剂对重油燃烧的催化作用

摘要 利用热重分析仪结合傅里叶变换红外光谱 (TG-FTIR) 结合 Friedman 动力学计算，研究了粘土岩作为基质在原位燃烧 (ISC) 过程中提高原油采收率中重油燃烧的催化作用， KAS 和 Vyazovkin 等转化方法。结果表明，三种类型的粘土均表现出良好的催化效果，活化能显着降低，主要表现为将燃料沉积（FD）转化为高温氧化（HTO）并移动低温氧化的温度峰值。 (LTO) 和 HTO 进入较低的温度。在所有粘土岩石中，云母型粘土的催化活性最好。