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• W2319553677 abstract "Asphaltene adsorption properties on mineral surfaces are fundamental to understanding wettability changes in rocks and fluid behavior in reservoirs. In this contribution we report an analytical approach to investigate the molecular features responsible for asphaltene–silica interactions. We used high performance thin layer chromatography silica plates and an elutropic series of solvents to fractionate asphaltenes according to their particular affinity with the mobile and stationary phases. We observed three characteristic asphaltene fractions (with Rf́s of 0, 0.69, and 0.90), which were in turn desorbed and analyzed by atmospheric pressure photoionization FT-ICR mass spectrometry (APPI-FT-ICR-MS). In general, polar noneluted compounds highly retained by the silica surface with Rf = 0 exhibit molecular compositions with N1, NnOo and Oo (o = 1, 2, 3 and n = 1, 2) classes and the lowest H/C ratios compared to the other subfractions. Polar CH2Cl2:MeOH-eluted compounds, with Rf = 0.69, have predominantly HC, N1, N3, N1O1, N3O1, N3O2, O1S1, O1S2, and S1 compound classes. Finally, toluene-eluted compounds with Rf = 0.90 exhibit mostly NnOoS1 and OoS1 compound classes. We established trends between compound retention characteristics and molecular features such as aromaticity, heteroatom/C ratios, and degree of alkylation. Additionally, we show that fractionation of asphaltene samples on silica surfaces expose many species not observed when analyzing the whole asphaltene mixture by APPI-FT-ICR-MS." @default.
• W2319553677 created "2016-06-24" @default.
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• W2319553677 date "2015-02-20" @default.
• W2319553677 modified "2023-10-18" @default.
• W2319553677 title "High Resolution Mass Spectrometric View of Asphaltene–SiO₂ Interactions" @default.
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• W2319553677 doi "https://doi.org/10.1021/ef502335b" @default.
• W2319553677 hasPublicationYear "2015" @default.
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