Kinetic and FT-i.r. studies of the sodium-catalysed steam gasification of coal chars

✍ Scribed by Shang Jung Yuh; Eduardo E. Wolf

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 740 KB
• Volume: 63
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(84)90235-7

✦ Synopsis

The catalytic effects of Na,COs, NaHCO,, NaOH, NaNO, and NaCl on steam gasification of coal chars have been studied by gravimetric measurements at temperatures ranging from 600 to 750X and at atmospheric pressure. FT-i.r. studies were carried out to determine the nature of the catalyst-coal interaction. All the salts studied, except NaCI, exhibited good catalytic activity. It was found that the gasification rate increased linearly with the sodium/carbon ratio until a saturation point was reached at a value of 0.12. For the same metal/carbon ratio, the sodium salts were less active than potassium salts, however their activities were similar when compared on the basis of cation loading. FT-i.r. studies of devolatilized and partially gasified samples treated with the active salts showed absorption bands at 1675, 1450 and 880 cm-'. Based on the gravimetric and i.r. results obtained, a model for the catalystcoal interaction is proposed.