Thermogravimetric Analysis of Heavy Oil Oxidation in the Presence of Nickel Based Catalysts

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS
O. V. Ostolopovskaya, Mohammed A. Khelkhal, A. A. Eskin, A. V. Vakhin
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Abstract

This study investigates the catalytic effects of Nickel-ligated catalysts derived from tall oil (NiTO) and sunflower oil (NiSFO) on the oxidation of heavy oil. Thermogravimetric (TG) analysis were employed to assess the thermal behavior and kinetics of heavy oil degradation. The Friedman isoconversional method provided the activation energies (Ea ), which were then used to derive thermodynamic parameters including changes in enthalpy (ΔH), entropy (ΔS), and Gibbs free energy (ΔG). The TG analysis revealed that both NiTO and NiSFO influence the degradation kinetics of heavy oil. Moreover, NiTO exhibited a consistent catalytic effect across a wide range of conversions, lowering the onset temperature of degradation and promoting faster degradation rates, which suggests a rapid breakdown at lower temperatures. Conversely, NiSFO demonstrated a substantial decrease in activation energy at mid-range conversions, indicating a highly efficient catalysis during these stages. In addition, thermodynamic analysis indicated that both catalysts alter the energetic profile of the reaction. Notably, NiSFO reduced ΔG significantly at lower conversions, enhancing the spontaneity of the reaction, while NiTO was associated with lower ΔG values across most conversions, implying a more favorable reaction throughout the process. The findings suggest that the choice of catalyst can be tailored based on the desired conversion range and reaction spontaneity in industrial heavy oil processing. These insights could be crucial for optimizing thermal treatments in heavy oil upgrading, offering potential improvements in the efficiency of in-situ combustion and enhanced oil recovery technologies.

Abstract Image

镍基催化剂作用下的重油氧化热重分析
本研究调查了从妥尔油(NiTO)和葵花籽油(NiSFO)中提取的掺镍催化剂对重油氧化的催化作用。采用热重(TG)分析评估了重油降解的热行为和动力学。弗里德曼等转换法提供了活化能(Ea),然后利用活化能推导出热力学参数,包括焓(ΔH)、熵(ΔS)和吉布斯自由能(ΔG)的变化。TG 分析表明,NiTO 和 NiSFO 都会影响重油的降解动力学。此外,NiTO 在很宽的转化率范围内表现出一致的催化效果,降低了降解的起始温度,促进了更快的降解速率,这表明在较低的温度下可以快速分解。相反,NiSFO 在中等转化率时活化能大幅降低,表明在这些阶段具有高效催化作用。此外,热力学分析表明,这两种催化剂都改变了反应的能量曲线。值得注意的是,NiSFO 在较低转化率时显著降低了 ΔG,增强了反应的自发性,而 NiTO 则在大多数转化率下降低了 ΔG,这意味着整个过程中的反应更为有利。研究结果表明,在工业重油加工过程中,可以根据所需的转化率范围和反应自发性来选择催化剂。这些见解对于优化重油提质过程中的热处理至关重要,有可能提高原地燃烧和强化采油技术的效率。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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