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- W159733454 endingPage "252" @default.
- W159733454 startingPage "63" @default.
- W159733454 abstract "It is the geoscience of coals, that is, their geochemistry of origin and postburial geological history, that suggests that coals are a very diverse set of materials. This chapter discusses the relations between the chemistry of coal macerals and reviews the biochemistry of their precursors and the biological markers in coals that are indicative of their origins. The content of carboxyl groups in coals is commonly determined by an ion-exchange reaction with barium acetate. Values of 1–4 milliequivalents per gram have been found for lignites and lower-rank subbituminous coals—decreasing with increasing rank and essentially zero for coals of higher rank—except that HVC coals of the Rocky Mountain province may contain some carboxyl. The cations in the carboxylates of low-rank coals can give rise to calcite deposits in liquefaction reactors, can promote liquefaction, and can give rise to catalysts for the gasification of lignite chars." @default.
- W159733454 created "2016-06-24" @default.
- W159733454 creator A5017637692 @default.
- W159733454 date "1984-01-01" @default.
- W159733454 modified "2023-10-15" @default.
- W159733454 title "An Essay on the Organic Geochemistry of Coal" @default.
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