Topic
Carbochemistry
About: Carbochemistry is a research topic. Over the lifetime, 1010 publications have been published within this topic receiving 16626 citations.
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TL;DR: The literature on the potassium catalysed gasification of carbon in CO2 is critically reviewed with respect to the mechanism and the experimental "facts" relevant to the mechanistic considerations as mentioned in this paper.
124 citations
01 Jan 1984
Abstract: Publisher Summary 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.
122 citations
TL;DR: In this paper, the authors describe the experimental techniques used, to develop low-cost, calcium catalysts for the steam gasification of coal and present the results obtained in this work.
109 citations
TL;DR: In this article, changes in the macromolecular structure of a lignite and a bituminous coal during rapid pyrolysis in the temperature range 300-1200 K are described.
100 citations
TL;DR: In this article, three different experimental probes were used to detect the presence of non-covalent interactions between aromatic groups in coals, and the pyridine extractability of coals is greater at 115 o C than at 25 o C, even though the solvent is not saturated in either case.
Abstract: Three different experimental probes were used to detect the presence of noncovalent interactions between aromatic groups in coals. The pyridine extractability of coals is greater at 115 o C than at 25 o C, even though the solvent is not saturated in either case. This is due to greater dissociation of the extractable molecules at the higher temperature. Since room temperature pyridine breaks the coal-coal hydrogen bonds, another noncovalent interaction must be responsible for the temperature dependence observed. Non-hydrogen-bond, noncovalent interactions play an important role in coal structure, and this role appears to increase with rank
98 citations