Catalytic Effect of Transition Metallic Additives on the Light Oil Low-Temperature Oxidation Reaction

Wang, Jiexiang; Wang, Tengfei; Feng, Chuanming; Yang, Chuanfang; Chen, Zheng; Lu, George J.

doi:10.1021/ef5023913

Cited by 13 publications

(10 citation statements)

References 64 publications

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“…Fassihi et al (1990) pointed out that the LTO mechanism for both light and heavy oils followed similar path: oils → resins → asphaltenes/32oke. The conversion of light components (saturates and aromatics) to groups of heavy species (resins and asphaltenes) in LTO reactions has also been reported in other literatures (Gui et al, 2010;Wang et al, 2015). The changes in oil compositions and corresponding quantities should be the reason why oil 1 and oil 2 become more viscous after reaction and oil 3 is transformed into coke completely.…”

Section: Qualitative Analysis Of Oxidized Oilssupporting

confidence: 61%

Low-temperature isothermal oxidation of crude oil

Liu

et al. 2016

Petroleum Science and Technology

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In this work, the low-temperature oxidation (LTO) characteristics of different API gravity crude oils, involving one light, one medium, and one heavy, are studied comprehensively from the aspects of effluent gas, oxidized oil, and pressure drop. The results reveal that heavy oil exhibits faster LTO reaction rate and stronger O 2 consumption capability compared with lighter ones. There are a certain amount of carbonaceous deposits in oxidized oils and the carbonation progress of heavy oil is brought to a deeper degree. The pressure drop rule of oil samples is speculated to be the consequence of "skin effect" and crude oil with more heavy species shows higher oxidation activity, which contributes to an improved understanding about the LTO mechanism from the molecular perspective and needs further research.

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Section: Qualitative Analysis Of Oxidized Oilssupporting

confidence: 61%

Low-temperature isothermal oxidation of crude oil

Liu

et al. 2016

Petroleum Science and Technology

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“…Therefore, the oxidation activity of SAR fractions is resins > aromatics > saturates when temperature is lower than 200°C. This finding is consistent with those documented elsewhere . The differences in oxidation activity of SAR fractions are due to the different molecular structures: Resins are a heavy fraction of crude oil, which contains a large number of aromatic rings, alicyclic rings, and kinds of short‐ and long‐chain branches, resulting in a strong polarity and can react with oxygen more easily than light fractions .…”

Section: Resultssupporting

confidence: 91%

Quantification of low‐temperature oxidation of light oil and its SAR fractions with TG‐DSC and TG‐FTIR analysis

Wang

Yang

et al. 2019

Energy Science & Engineering

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The oxidation reaction is the key to determining the success of air flooding. In this paper, experimental and theoretical techniques have been developed to identify the low-temperature oxidation (LTO) mechanisms for light oil during air flooding by comprehensively analyzing thermal stability and oxidation process of the crude oil and its SAR (ie, saturates, aromatics, and resins) fractions. Experimentally, both a thermogravimetric analyzer coupled with differential scanning calorimetry (TG-DSC) and a thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR) are employed to quantify the LTO process of crude oil and each SAR fraction as well as the corresponding oxidation properties. Theoretically, reaction models have been developed to reproduce the experimentally identified reactions. The results show that the oxygen addition reaction and the bond scission reaction occur simultaneously. The former can be initiated when temperature is higher than 50°C, and it is gradually shifted to the latter with the continuous increase in reservoir temperature. The LTO products of light oil include H 2 O, CO 2 , carboxylic acids, alcohols, phenols, and ethers. Saturates, aromatics, and resins are all the sources of H 2 O, CO 2 , alcohols, and carboxylic acids, whereas ethers are mainly derived from aromatics and resins. At the beginning of an air flooding process, heat is mainly generated from the oxidation of aromatics and resins. Subsequently, oxidizing saturates gradually dominates the air flooding process with an increase in the reservoir temperature. K E Y W O R D Scrude oil, LTO mechanism, oxidation process, SAR fraction, thermal stability How to cite this article: Wang T, Wang J, Yang W, Yang D. Quantification of low-temperature oxidation of light oil and its SAR fractions with TG-DSC and TG-FTIR analysis. Energy Sci Eng. 2020;8:376-391.

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“…The static oxidation experimental setup (Hai'an Petroleum Research Instrument Co., Ltd., Hai'an, China) used in this research is the same as that of the previous study [35,39]. The schematic of the static oxidation experiment setup is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…The catalyst used in this research is cobalt naphthenate which had good oil solubility, and the catalyst dosage was 0.08 mol/L. The LTO reaction rate is determined applying the material balance method [39,42].…”

Section: Static Oxidation Experimentsmentioning

confidence: 99%

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Catalytic Effect of Cobalt Additive on the Low Temperature Oxidation Characteristics of Changqing Tight Oil and Its SARA Fractions

Wang

2019

Energies

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Air flooding is a potential enhanced oil recovery (EOR) method to economically and efficiently develop a tight oil reservoir due to its sufficient gas source and low operational costs, during which low temperature oxidation (LTO) is the key to ensuring the success of air flooding. In addition to inefficiency of conventional LTO, air flooding has seen its limited applications due to the prolonged reaction time and safety constraints. In this paper, a novel air injection technique based on the catalyst-activated low temperature oxidation (CLTO) is developed to improve the operational safety together with its oil recovery in tight oil reservoirs. Experimentally, static oxidation experiments are conducted to examine the influence of the catalyst on the LTO reaction kinetics of Changqing tight oil and its fractions. The catalytic oxidation characteristics are identified by applying a thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR) with respect to tight oil and its SARA (i.e., saturates, aromatics, resins, and asphaltenes) fractions. Accordingly, the catalyst can obviously decrease the LTO reaction activation energy of the Changqing tight oil and its SARA fraction. Cobalt additive can change the LTO reaction pathways of the SARA fractions, i.e., promoting the formation of hydroxyl-containing oxides and CO 2 from the oxidation of saturates, aromatics and resins, while inhibiting the formation of ethers from the oxidation of aromatics and resins. The LTO of each SARA fraction contains both oxygen addition reaction and bond scission reaction that can be effectively promoted with the cobalt additive. The catalytic effect on the bond scission reaction is continuously enhanced and becomes gradually stronger than that on the oxygen addition reaction as the reaction proceeds.

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Catalytic Effect of Transition Metallic Additives on the Light Oil Low-Temperature Oxidation Reaction

Cited by 13 publications

References 64 publications

Low-temperature isothermal oxidation of crude oil

Low-temperature isothermal oxidation of crude oil

Quantification of low‐temperature oxidation of light oil and its SAR fractions with TG‐DSC and TG‐FTIR analysis

Catalytic Effect of Cobalt Additive on the Low Temperature Oxidation Characteristics of Changqing Tight Oil and Its SARA Fractions

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