Study of Low Temperature Coal Oxidation by super(13)C CP/MAS n.m.r

Subbituminous coal samples were withdrawn during dry phase oxidation with air at fixed intervals up to 12 hr. Reaction pathways and chemical changes occurring in coal structure were studied by carbon 13-labeled nuclear magnetic resonance spectroscopy, elemental analysis, and weights variation. At ea...

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Bibliographic Details
Published in:Fuel (Guildford) 1989-09, Vol.68, p.1168-1168
Main Authors: Rausa, R, Calemma, V, Ghelli, S, Girardi, E
Format: Article
Language:English
Online Access:Get full text
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Summary:Subbituminous coal samples were withdrawn during dry phase oxidation with air at fixed intervals up to 12 hr. Reaction pathways and chemical changes occurring in coal structure were studied by carbon 13-labeled nuclear magnetic resonance spectroscopy, elemental analysis, and weights variation. At each temperature tested, aliphatic C is more reactive than aromatic C; aromatic C does not seem to be affected by oxidation at temepratures below 200 degree C. A decrease in the aromatic C of 15% at 250 degree C, and 20% at 275 degree C was detected after 12 hr of oxidation. Weight losses at these temperatures were mainly due to combustion of the aliphatic structure.
ISSN:0016-2361