Vector saturation transfer e.s.r. studies of coal
โ Scribed by Yuhei Shimoyama; Osamu Ichikawa; Hiroshi Watari
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 728 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0016-2361
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๐ SIMILAR VOLUMES
Wyodak and Heatburg subbituminous coals were pyrolysed in-situ in an e.s.r. microwave cavity at -510ยฐC in an evacuated sealed tube. At least two kinds of radicals are detected; first, phenalenyl-like radicals and then, polymerized radicals from the initial ones.
Changes in the macroscopic structure of coal have been observed as an outburst-prone area is approached. Associated with this structural change was an increase in the concentration of paramagnetic centres. initial results suggested that this increase was not due to variation in maceral content with
An investigation was carried out to explore the importance of two line-broadening mechanisms which may be responsible for the width of the electron spin resonance signals exhibited by coals. Studies of catalytically dehydrogenated coals, isotopically substituted low-temperature chars, and a large nu