Journal ArticleDOI
Structural Evolution of a Sedimentologically Homogeneous Coal Series As a Function of Carbon Content By Solid-state C-13 Nmr
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In this article, the cross polarization technique combined with magic-angle spinning has been applied to obtain 13C n.m. spectra of a sedimentologically homogeneous series of peat, lignite and bituminous coal derived from higher plants.About:
This article is published in Fuel.The article was published on 1983-05-01. It has received 65 citations till now.read more
Citations
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Journal ArticleDOI
Aspects of the chemical structure of soil organic materials as revealed by solid-state 13C NMR spectroscopy
TL;DR: In this paper, the authors used solid-state cross-polarization/magic-angle-spinning 3C NMR spectroscopy to characterise semi-quantitatively the organic materials contained in particle size and density fractions isolated from five different mineral soils.
Journal ArticleDOI
Chemical modelling of kerogens
Françoise Behar,M. Vandenbroucke +1 more
TL;DR: In this paper, the same molecular weight of about 25,000 has been chosen for the different models of kerogens at the beginning of the diagenesis stage, in order both to get a statistical representation and make comparisons easier.
Journal ArticleDOI
Practical criteria for classifying kerogens: Some observations from pyrolysis-gas chromatography
TL;DR: In this paper, two pyrolysis-gas chromatography (Py-GC) techniques were used to gain a succinct perspective of kerogen composition and structure which, by comparison with (13C NMR data, appears to be representative of the kerogen structure in toto.
Journal ArticleDOI
Characterization of Organically Bound Oxygen Forms in Lignites, Peats, and Pyrolyzed Peats by X-ray Photoelectron Spectroscopy (XPS) and Solid-State 13C NMR Methods
TL;DR: A combination of XPS and solid-state 13C NMR techniques have been used to characterize organic oxygen species and carbon chemical/structural features in peats, pyrolyzed peats and lignites.
Journal ArticleDOI
The effects of early diagenesis on the chemical and stable carbon isotopic composition of wood
TL;DR: The authors showed that there is a linear correlation between carbohydrate content and the stable carbon isotope composition as carbohydrates are preferentially degraded during early diagenesis of wood, and that attempts to quantify terrestrial inputs to modern sedimentary organic matter based on δ 13 C values should consider the possibility of a 1 to 2 per mil decrease in the degraded wood value of degraded wood.
References
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Petroleum Formation and Occurrence
TL;DR: The early transformation of organic matter from organisms to geochemical fossils and Kerogen has been studied in the literature as mentioned in this paper, with a focus on the migration and accumulation of oil and gas.
Journal ArticleDOI
Proton‐enhanced NMR of dilute spins in solids
TL;DR: In this article, the NMR signals of isotopically or chemically dilute nuclear spins S in solids can be enhanced by repeatedly transferring polarization from a more abundant species I of high abundance (usually protons) to which they are coupled.
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Magic-Angle13C NMR Analysis of Motion in Solid Glassy Polymers
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Magic-angle spinning and polarization transfer in proton-enhanced NMR
TL;DR: In this article, a semiquantitative theoretical analysis is presented which describes the principal features of these phenomena in terms of the amplitude and frequency modulation of the dipolar interactions between and among the two spin systems and provides some qualitative insight into how incoherent random molecular motion affects transfer in cross-polarization experiments.
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Resolution in 13C NMR of organic solids using high-power proton decoupling and magic-angle sample spinning
TL;DR: In this paper, the authors investigated important 13C line-broadening mechanisms in organic solids and their dependences on experimental parameters, notably static and rf magnetic field strength, and showed that no significant gain in resolution will be enjoyed at high magnetic fields, especially when variable-temperature operation is available.