High Resolution Mass Spectrometric View of Asphaltene–SiO2 Interactions
| Autor: | Marianny Y. Combariza, Jorge A. Orrego-Ruiz, Martha L. Chacón-Patiño, Cristian Blanco-Tirado, Andrea Gómez-Escudero |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Energy & Fuels. 29:1323-1331 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/ef502335b |
| Popis: | 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 Rfs 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, N... |
| Databáze: | OpenAIRE |
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