Organic geochemical studies of the transformation of gymnospermous xylem during peatification and coalification to subbituminous coal
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Abstract
Organic geochemical investigations of peatified and coalified xylem from gymnosperms have provided useful information on the organic transformational processes collectively known as coalification. The combined use of solid-state 13C nuclear magnetic resonance (NMR) and pyrolysis/gas chromatography/mass spectrometry (py/gc/ms) has allowed us to examine the organic composition of peatified and coalified xylem on both a bulk (average) compositional basis and on a detailed molecular basis. We conclude from our studies that coalification of gymnospermous xylem involves the following processes1.
(1) early selective removal of cellulosic materials so that lignin, a primary constituent of xylem, is transformed to macromolecular aromatic components in coal;2.
(2) modification of gymnospermous lignin by demethylation to form catechol-like structures, and by condensation reactions to induce a high level of cross-linking at an early stage of coalification; and
(3) dehydroxylation during increasing coalification to subbituminous coal, the resultant xylem becomes more phenolic in character as the catechol-like structures decrease.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Organic geochemical studies of the transformation of gymnospermous xylem during peatification and coalification to subbituminous coal |
| Series title | International Journal of Coal Geology |
| DOI | 10.1016/0166-5162(89)90090-6 |
| Volume | 16 |
| Issue | 1-3 |
| Year Published | 1990 |
| Language | English |
| Publisher | Elsevier |
| Description | 4 p. |
| First page | 193 |
| Last page | 196 |
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