Structural changes of an anthracite char during the reaction with sulphur dioxide

✍ Scribed by Thomas Panagiotidis; Ekkehard Richter; Harald Jüntgen

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 912 KB
• Volume: 26
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(88)90013-9

✦ Synopsis

Anthracite char is used in an industrial process as reducing agent at temperatures above 750°C for the reduction of sulphur dioxide in SO,-rich gases produced by regenerative processes for flue gas desulphurization. The reactions of sulphur dioxide and water vapor, if water vapor is present, do not take place only at the external surface of anthracite char at temperatures below 850°C. Micropores develop from the existing macropores within the 2.15 to 3.0 mm particles. On the surface of the micropores, sulphur accumulates due to the formation of stable surface complexes. The latter can be decomposed by reaction with water vapor. The a~umulation of sulphur is detected by chemical analysis and by a microprobe coupled to an electron scanning microscope; the development of the pore structure is investigated by adsorption techniques.