Structural Composition and Molecular Weight Distribution of Dissolved Organic Matter in Bituminous Oil Sand from Okitipupa, Southern Nigeria

IF 2.9 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Earth and Space Chemistry Pub Date : 2024-08-05 DOI:10.1021/acsearthspacechem.4c00062

Gbenga Aladekoyi, Emmanuel G. Olumayede, Samuel O. Olusanya, Patricia A. Heiden, Simeon K. Schum

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Abstract

The structural and exact molecular weight composition of the dissolved organic matter present in the oil sand from Okitipupa was investigated. Microscopic and spectroscopic methods were employed to determine the mineral composition and molecular structure of the compounds detected in the extracted bitumen. The extracted composite (dichloromethane/toluene solvent (D:T) ratio was 1:1 (50 mL each) and the sample-to-solvent ratio was 1:2.5 at 60 °C and 300 r/min. Elemental quantification of the oil sand from P1 (Loda) and P2 (Idiopopo) indicated a vast interaction of bitumen with clay minerals through their forms and compositions. The highest extractive quality of the compounds was obtained from P1 using 50:50 D:T extraction. P1 indicated an appreciable percentage of organic compounds with a maximum number of asphaltenes and aromatics as major components of bitumen, saturates, and resin. In P1, high concentrations of heteroatoms like nitrogen, oxygen, sulfur, and metals contributed to an increase in the viscosity and bonding of bitumen with embedded minerals compared to others. Oil sand in this region consists of complex heteroatomic compounds. Meanwhile, the van Krevelen plot revealed that the majority of formulas are in the regions H/C 0.5–2.5 m/z and O/C 0.1–0.5 m/z, which confirmed the diversity in the distribution of mass formulas for the samples. This revealed an important suggestion for understanding the geochemistry and exploitation of bitumen.

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尼日利亚南部 Okitipupa 沥青油砂中溶解有机物的结构组成和分子量分布

研究了奥基提普帕油砂中溶解有机物的结构和确切分子量组成。采用显微镜和光谱方法确定了提取的沥青中检测到的化合物的矿物成分和分子结构。在 60 °C 和 300 r/min 的条件下，萃取复合剂（二氯甲烷/甲苯溶剂 (D:T) 的比例为 1:1（各 50 mL），样品与溶剂的比例为 1:2.5。对 P1（Loda）和 P2（Idiopopo）油砂进行的元素定量分析表明，沥青与粘土矿物通过其形态和成分发生了巨大的相互作用。P1 采用 50:50 D:T 萃取法提取的化合物质量最高。P1 表明有机化合物的比例相当高，沥青的主要成分沥青烯和芳烃的数量最多，饱和物和树脂也是如此。在 P1 中，氮、氧、硫和金属等杂原子的浓度较高，与其他成分相比，这有助于增加沥青的粘度和与嵌入矿物的粘合力。该地区的油砂由复杂的杂原子化合物组成。同时，van Krevelen 图显示，大多数公式位于 H/C 0.5-2.5 m/z 和 O/C 0.1-0.5 m/z 区域，这证实了样品质量公式分布的多样性。这为了解沥青的地球化学和开采提供了重要建议。

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来源期刊

ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

5.30

自引率

11.80%

发文量

249

期刊介绍： The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.