Journal ArticleDOI
Characterization of the residual carbon in retorted oil shale by solid-state 13C n.m.r.
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In this article, the authors used 13C n.m.r. measurements of the organic carbon distribution of oil shales, before and after Fischer assaying, and for oil shale of different grades, geographic location, geologic ages and formations.About:
This article is published in Fuel.The article was published on 1982-04-01. It has received 55 citations till now. The article focuses on the topics: Oil shale & Shale oil.read more
Citations
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Journal ArticleDOI
On the mechanism of kerogen pyrolysis
Alan K. Burnham,James A. Happe +1 more
TL;DR: Aromaticities determined by 13 C n.m.r. as discussed by the authors for five shale oil samples (Green River formation) prepared under widely different pyrolysis conditions.
Journal ArticleDOI
Evolution of Kerogen and Bitumen during Thermal Maturation via Semi-Open Pyrolysis Investigated by Infrared Spectroscopy
Paul R. Craddock,Tuong Van Le Doan,Kyle D. Bake,Marina Polyakov,Alyssa Charsky,Andrew E. Pomerantz +5 more
TL;DR: In this article, the structural characteristics of bitumen and type I kerogen were compared using quantitative Fourier transform infrared (IR) spectroscopy, and it was shown that bitumen has a structure intermediate between that of kerogen and generated petroleum.
Journal ArticleDOI
High-resolution nuclear magnetic resonance of solids.
TL;DR: The development of line-narrowing techniques, such as magic-angle spinning and high-power decoupling, has led to powerful high-resolution nuclear magnetic resonance approaches for solid samples and a continuing stream of advances holds great promise for the use of high- resolution techniques for the characterization of solids by a wide range of nuclides.
Journal ArticleDOI
Three-Dimensional Structure of a Huadian Oil Shale Kerogen Model: An Experimental and Theoretical Study
TL;DR: In this article, a series of Huadian kerogen isomers were constructed on the basis of these structural data using density functional theory (DFT) calculations, which showed an about 16.8 kcal mol-1 decrease in total energy consumption for the carbon skeleton isomer.
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13C Nuclear magnetic resonance studies of kerogen from Cretaceous black shales thermally altered by basaltic intrusions and laboratory simulations
TL;DR: In this article, the extent of the thermal alteration of black shale from DSDP Leg 41, Site 368 in the Eastern Atlantic Ocean was determined by means of 13C nuclear magnetic resonance, using cross polarization/magic-angle spinning (CP/MAS).
References
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Journal ArticleDOI
Estimation of coal aromaticities by proton-decoupled carbon-13 magnetic resonance spectra of whole coals
TL;DR: In this paper, a cross-polarization technique was applied to obtain high-resolution carbon-13 spectra of vitrains from two coals, which overcomes the problem of dipolar line broadening by protons, permits estimates of the carbon aromaticities of solid coals.
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Prospects for carbon-13 nuclear magnetic resonance analysis of solid fossil-fuel materials
TL;DR: In this paper, it is shown that cross-polarization spectra obtained with dipolar decoupling display chemical shift anisotropy which interferes with attempts to distinguish the resonances of aromatic and aliphatic carbons.
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Correlation between oil yields of oil shales and 13C nuclear magnetic resonance spectra
TL;DR: Using the cross polarization/dipolar decoupling method, 13C n.m. spectra have been obtained on twenty oil shales and kerogens from around the world.
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Determination of aromatic hydrocarbon fraction in oil shale by 13C n.m.r. with magic-angle spinning
TL;DR: A method for estimation of aromatic content in oil shales is demonstrated in this paper, where magic-angle spinning at 2 kHz is shown to remove chemical shift anisotropy to a sufficient degree to resolve aromatic and aliphatic 13 C n.m.r. spectral regions for a lithic oil shale specimen.
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Use of Fourier Transform infrared spectroscopy for determining oil shale properties
TL;DR: Fourier Transform infrared analysis has been examined as a technique for evaluating the oil-yielding potential of raw oil shales The technique was developed recently for analysing coals, and gives a quantitative measure of aliphatic, aromatic and hydroxyl hydrogen.