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Distribution of chemisorbed oxygen in mildly oxidized caking coal

✍ Scribed by Boleslaw S. Ignasiak; Adam J. Szladow; Norbert Berkowitz

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
349 KB
Volume
53
Category
Article
ISSN
0016-2361

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✦ Synopsis

A high-volatile A bituminous coal was oxidized with I802 at 100Β°C for 72 h and the resultant 'oxycoal' heat-treated at atmospheric pressure and in vacua at temperatures up to 430Β°C. The '*O content was determined in the 'oxycoal' before and after heat treatment, and in extracts and residues obtained from chloroform extraction of heat-treated 'oxycoal'. In addition, unheated 'oxycoal' was extracted with pyridine and chloroform, and [I801 was measured in the a-, /3-and y-fractions. The results support the view that decreased yields of chloroform-soluble matter (and corresponding loss of plasticity) associated with oxidation are mainly due to condensation reactions which reactive oxygen-bearing groups undergoduring heat treatment, and that the extent of these reactions is markedly sensitive to pressure.

πŸ“œ SIMILAR VOLUMES

Oxidation studies on coking coal related
Oxidation studies on coking coal related to weathering: Part 2. The distribution of absorbed oxygen in the products resulting from the pyrolysis of slightly oxidized coking coal
✍ B.S. Ignasiak; D.M. Clugston; D.S. Montgomery πŸ“‚ Article πŸ“… 1972 πŸ› Elsevier Science 🌐 English βš– 578 KB

A high-volatile A bituminous coal was oxidized with 180, at 1OO'C for 72 h to simulate weathering, and subsequently pyrolysed at various temperatures to drive off C180,, C1801%, C1%,, C180, C160, Hz180, Hz'%. These gases were subsequently analysed by massspectrometry. The results indicate that 60%