Molecular sieve characteristics of slightly activated anthracite

✍ Scribed by R.L. Patel; S.P. Nandi; P.L. Walker Jr

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 522 KB
• Volume: 51
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(72)90037-3

✦ Synopsis

Attempts have been made to improve the molecular sieve properties of anthracite by devolatilization and subsequent activation to low burn-offs (8.0.) in oxygen at 427 + 3OC. Methane diffusion into samples reacted up to 89% B.O. was activated. With further increase in B.O. to 9-l%, the effect of temperature on diffusion became negligible. Surface areas of the activated samples available to carbon dioxide at 25'C, nitrogen at -195'C and neopentane at 0°C have been measured. It was observed that at the B.O. where the neopentane area approaches the nitrogen area, the activation energy of methane diffusion is small. This indicates that activation of coal to small B.O. can lead to the production of molecular sieves.