2016
DOI: 10.1021/acs.energyfuels.6b01238
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Impact of Laboratory-Induced Thermal Maturity on Asphaltene Molecular Structure

Abstract: The structure of asphaltenes of various maturities prepared by semiopen pyrolysis of Green River Shale is measured by elemental analysis, laser desorption laser ionization mass spectrometry (L2MS), surface assisted laser desorption ionization (SALDI) mass spectrometry, sulfur X-ray absorption near edge structure (XANES) spectroscopy, and infrared (IR) spectroscopy. These measurements demonstrate systematic changes in the composition of asphaltenes during thermal maturation. At low maturities, the evolution of … Show more

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Cited by 26 publications
(39 citation statements)
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“…Sulfur K-edge XANES measures the speciation of sulfur within nonvolatile hydrocarbon mixtures. The technique has been described previously and is summarized here. Previous XANES studies have examined sulfur speciation in coals, kerogen, bitumen, ,, asphalts, and asphaltenes. Transitions from sulfur 1s orbitals to molecular orbitals with significant 3p character are measured.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Sulfur K-edge XANES measures the speciation of sulfur within nonvolatile hydrocarbon mixtures. The technique has been described previously and is summarized here. Previous XANES studies have examined sulfur speciation in coals, kerogen, bitumen, ,, asphalts, and asphaltenes. Transitions from sulfur 1s orbitals to molecular orbitals with significant 3p character are measured.…”
Section: Methodsmentioning
confidence: 99%
“…If intermolecular attractions and repulsions are not balanced properly, a material will not meet the solubility definition of asphaltene. In particular, if a material has too strong intermolecular interactions, toluene molecules will be excluded, and the material will not dissolve in toluene; on the other hand, if a material has too weak intermolecular interactions, n -heptane molecules will not be excluded, and the material will not precipitate in n -heptane. , …”
Section: Introductionmentioning
confidence: 99%
“…7b). Thermal maturation changes the compositions and textures of bitumen, increasing the aromaticity and decreasing the H/C ratio of bitumen [90,91]. Comparing with the coals, PSDμ of the mudstones show an additional peak at 0.35 nm, which likely come from the clay minerals.…”
Section: Micropore Changes By Solvent Extraction Based On Co2 Adsorptionmentioning
confidence: 99%
“…Recently, molecular weight of the organic matter that was artificially matured in a semiopen pyrolysis system to various levels of thermal maturities from Green River Shale Formation was quantified using various mass spectrometry methods including laser desorption laser ionization (L 2 MS), surface assisted laser desorption ionization (SALDI) [10], and matrix-assisted laser desorption ionization (MALDI) [11,12]. Results showed a systematic change in molecular weights and correlation between elemental analysis and mass spectroscopy results.…”
Section: Molecular Weight Distribution Of Kerogen With Maldi-tof-ms Imentioning
confidence: 99%