Effect of air-oxidation on the pore-structure of coals and cokes or chars obtained from oxidized coals

✍ Scribed by Hirokazu Oda; Masami Takeuchi; Chikao Yokokawa

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 762 KB
• Volume: 60
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(81)90275-1

✦ Synopsis

Seven kinds of coals (C, 77.S89.8 wt% daf) were oxidized with air at 150°C for 1, 5 and 10 h. The oxidized coals were heat-treated at various temperatures between 300 and 1500°C with intervals of 50 or 100°C. The pore-structure of the oxidized coals and the cokes or chars obtained from the oxidized coals was compared with those of parent coals and their cokes or chars. True densities were measured in methanol and straight-chain hexane and pore volumes were determined by the Dubinin-Polanyi procedure. For the coals, the methanol-density increased with extent of oxidation; the hexanedensity increased at first, but then decreased and again increased in the course of the oxidation. The air-oxidation of coals has a marked and controlling effect on the development of the pore-structure of cokes and chars in the course of the carbonization.

A number of studies have been done on the pore-structure of coals, cokes and chars lP5 The air-oxidation has .