Sulphur in coal by programmed-temperature oxidation

✍ Scribed by Robert B. LaCount; Richard R. Anderson; Sidney Friedman; Bernard D. Blaustein

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 642 KB
• Volume: 66
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(87)90328-0

✦ Synopsis

A controlled-atmosphere, programmed-temperature, oxidation apparatus has been constructed and used to characterize organic-sulphur distribution in coals, partially desulphurized coals, and model systems. Samples were diluted with WO, and heated, in a stream of Ar containing 10% 02, at a programmed-temperature increase of 3°C min-'. Concentrations of SO,, CO,, CO, 0, and H,O in the etlluent gas were continuously measured until the runs were completed at 1000°C. Evolution patterns produced by the oxidation products characterize the coal and, upon integration, provide total C-H-S analyses consistent with classical coal analysis methods. The SO, derived from coal pyrite evolves with a maximum at about 43o"C, and that from the organic portion ofcoal produces principal evolution maxima at s 320°C (attributed to non-aromatic coal structures) and at = 480°C (attributed to aromatic structures). During oxidation the H/C ratio decreases with increasing temperature to z 060.7 at 400°C. The n.m.r. spectrum of residue isolated after oxidation up to 400°C shows a sharp decrease in aliphatic carbon compared with the original coal.