Structural evolution of a sedimentologically homogeneous coal series as a function of carbon content by solid state 13C n.m.r.

Dereppe, Jean-Marie; Boudou, Jean-Paul; Moreaux, Claudette; Durand, Bernard

doi:10.1016/0016-2361(83)90229-6

Cited by 64 publications

(20 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurement conditions were as follows: the contact time was 2.5 ms, with a recycle delay of 5 s and a scan number greater than 2000. The total signal intensity and the proportion contributed by each carbon grouping were determined by integration using the five spectral areas [29] delineated in Table 1.…”

Section: Analysis Of the Raw And Treated Coalmentioning

confidence: 99%

Upgrading of low rank coal by hydrothermal treatment: Coal tar yield during pyrolysis

Zhang

Liu

et al. 2016

Fuel Processing Technology

103

View full text Add to dashboard Cite

Section: Analysis Of the Raw And Treated Coalmentioning

confidence: 99%

Upgrading of low rank coal by hydrothermal treatment: Coal tar yield during pyrolysis

Zhang

Liu

et al. 2016

Fuel Processing Technology

103

View full text Add to dashboard Cite

“…Solid-state CP/MAS ' 3 C NMR had been used previously in numerous studies to examine the chemical changes associated with the decomposition of the natural organic materials contained in peats (Preston et al 1987, Hammond et al 1985, Hatcher et al 1986, Zech et al 1985, Dereppe et al 1983, litter layers of mull, mor and moder type forest soils (Kogel et al 1987;Kogel-Knabner et al 1988;Hempfling et al 1987), decomposing fallen logs (Preston et al 1990) and buried wood (Hatcher et al 1981(Hatcher et al , 1989Bates et al 1991;Hedges et al 1985;Spiker and Hatcher 1987;Stout et al 1988). As observed in this study, a decrease in the relative intensity of O-alkyl carbon resonances and an increase in the alkyl carbon resonances as the extent of decomposition increased was noted in all cases.…”

Section: Chemical Changes Associated With the Decomposition Of Plant mentioning

confidence: 99%

Aspects of the chemical structure of soil organic materials as revealed by solid-state13C NMR spectroscopy

et al. 1992

View full text Add to dashboard Cite

Solid-state cross-polarisation/magic-angle-spinning 3 C nuclear magnetic resonance (CP/MAS 13 C NMR) spectroscopy was used to characterise semi-quantitatively the organic materials contained in particle size and density fractions isolated from five different mineral soils: two Mollisols, two Oxisols and an Andosol. The acquired spectra were analysed to determine the relative proportion of carboxyl, aromatic, O-alkyl and alkyl carbon contained in each fraction. Although similar types of carbon were present in all of the fractions analysed, an influence of both soil type and particle size was evident.The chemical structure of the organic materials contained in the particle size fractions isolated from the Andosol was similar; however, for the Mollisols and Oxisols, the content of O-alkyl, aromatic and alkyl carbon was greatest in the coarse, intermediate and fine fractions, respectively. The compositional differences noted in progressing from the coarser to finer particle size fractions in the Mollisols and Oxisols were consistent with the changes noted in other studies where CP/MAS 3 C NMR was used to monitor the decomposition of natural organic materials. Changes in the C:N ratio of the particle size fractions supported the proposal that the extent of decomposition of the organic materials contained in the fine fractions was greater than that contained in the coarse fractions. The increased content of aromatic and alkyl carbon in the intermediate size fractions could be explained completely by a selective preservation mechanism; however, the further accumulation of alkyl carbon in the clay fractions appeared to result from both a selective preservation and an in situ synthesis.The largest compositional differences noted for the entire organic fraction of the five soils were observed between soil orders. The differences within orders were smaller. The Mollisols and the Andosol were both dominated by O-alkyl carbon but the Andosol had a lower alkyl carbon content. The Oxisols were dominated by both O-alkyl and alkyl carbon.A model describing the oxidative decomposition of plant materials in mineral soils is proposed and used to explain the influence of soil order and particle size on the chemical composition of soil organic matter in terms of its extent of decomposition and bioavailability.

show abstract

“…Not only was oil found, but also a series of coaly sediments extending from the present surface to depths of about 4000 m (Allen et al, 1976). A small part of the work, which also describes the geologic setting, has been published in Fuel (Monin et al, 1981 ;Dereppe et al, 1983). Below the surface there are a number of coal seams interspersed by organic-poor sands or sandstones and organic-rich shales (8-9% organic matter).…”

Section: Vertical Variation In a Series Of Related Seamsmentioning

confidence: 99%

An Essay on the Organic Geochemistry of Coal

Given¹

1984

Coal Science

View full text Add to dashboard Cite

Structural evolution of a sedimentologically homogeneous coal series as a function of carbon content by solid state 13C n.m.r.

Cited by 64 publications

References 10 publications

Upgrading of low rank coal by hydrothermal treatment: Coal tar yield during pyrolysis

Upgrading of low rank coal by hydrothermal treatment: Coal tar yield during pyrolysis

Aspects of the chemical structure of soil organic materials as revealed by solid-state13C NMR spectroscopy

An Essay on the Organic Geochemistry of Coal

Contact Info

Product

Resources

About