天然矿物低温催化脂肪酸酯生烃反应动力学研究

Kinetics on hydrocarbon generation from fatty acid ester in the presence of natural minerals at low temperature

选择十八烷酸甲酯为模型化合物,以10种天然矿物为载体,通过动力学方法考察了天然矿物对脂肪酸酯生烃反应的催化作用。结果表明,地质低温条件下天然矿物对脂肪酸酯生烃反应具有催化作用。矿物的催化作用主要体现在对反应活化能和指前因子的影响上。粘土、碳酸盐和金属元素对于脂肪酸酯生烃反应具有不同的催化作用,碳酸盐矿物相对于粘土矿物使生烃反应的活化能降低,过渡金属化合物矿物存在时,催化反应活化能介于碳酸盐和粘土矿物之间。天然矿物的存在能够升高或降低反应指前因子。

Methyl stearate is chosen as the model compound absorbed by 10 different samples of natural minerals, to investigate the catalysis of minerals uponthe hydrocarbon generation of fatty acid ester. The results show that the minerals acting as catalysts play important roles in promoting the hydrocarbon generation of fatty acid ester at geological low temperature. The catalysis of minerals was acquired by influencing reaction activation energies and pre-exponentialfactors. The catalysis of clays, carbonates and transition metals are different. Activation energies of hydrocarbon generation in reactions catalyzed by carbonates are lower than those by clays, while the corresponding values of transitionmetal compounds are in the midst. Pre-exponential factors raise or lower under the catalysis of natural minerals.