A better understanding of the nature of crude oil compounds that preferentially interact with certain types of solids is essential to visualize solutions to challenges in oil fields, such as enhancing the oil recovery factor, via wettability alteration, and remediating emulsions stabilized by fines, among others. The simplistic assumption that the organic matter linked to hydrophilic solids corresponds to polar fractions (i.e., asphaltenes) needs more compositional detail. In an attempt to elucidate this important issue, in the present work, the organic species from an oil adsorbed on silica, alumina (synthetic solids), bentonite, and kaolinite (clays) were isolated and subsequently identified by infrared spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry in atmospheric pressure photoionization positive mode. The solids were characterized by X-ray powder diffraction and point of zero charge. Interestingly, the nature of adsorbed compounds depends upon either the surficial charge of the solids or the acidic character of the functional groups. Through both infrared spectroscopy and mass spectrometry, consistent and complementary results were achieved. The preferential adsorption of nitrogen basic compounds on bentonite and kaolinite was evidenced, promoted by the presence of metal–OH groups on the clay surface. Furthermore, that compounds adsorbed on all of the materials had slightly lower aromaticity than asphaltene-type compounds but an important contribution of oxygen compounds, which included sulfone-type compounds not detected in the asphaltene fraction. Highly conjugated aromatic oxygenated species were identified in the adsorbed organic matter by alumina, while oxygenated acidic compounds (carbonyl derivatives) were identified in the extracts recovered from silica, kaolinite, and bentonite.

中文翻译：

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红外光谱和质谱法表征固体吸附的石油化合物

更好地理解优先与某些类型的固体相互作用的原油化合物的性质，对于可视化解决油田挑战的解决方案至关重要，例如，通过改变可湿性来提高采油率，以及修复由细粉稳定的乳液等。 。与亲水性固体连接的有机物对应于极性馏分（即沥青质）的简单假设需要更多的成分细节。为了阐明这一重要问题，在本工作中，从吸附在二氧化硅，氧化铝（合成固体），膨润土和高岭石（粘土）上的油中分离出了有机物质，然后通过红外光谱和傅里叶变换离子回旋加速器进行了鉴定。大气压光电离正模式的共振质谱。通过X射线粉末衍射和零电荷点表征固体。有趣的是，吸附的化合物的性质取决于固体的表面电荷或官能团的酸性。通过红外光谱和质谱，均获得了一致和互补的结果。氮基化合物在膨润土和高岭土上的优先吸附得到了证明，这是由于粘土表面上存在金属-OH基团而促进的。此外，吸附在所有材料上的化合物的芳香性略低于沥青质类化合物，但含氧化合物的重要贡献，其中包括在沥青质级分中未检测到的砜类化合物。