Adsorption of hydrocarbons on CO2-reacted activated carbons

✍ Scribed by J. Garrido; J.M. Martín-Martínez; M. Molina-Sabio; F. Rodríguez-Reinoso; R. Torregrosa

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 610 KB
• Volume: 24
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(86)90270-8

✦ Synopsis

series of carbons covering the burn-off range 5-82% has been obtained by slow gasification at 1098 K in CO, of carbonized almond shells. The adsorption of hydrocarbons with different molecular sizes (benzene, n-butane, iso-butane, cyclohexane, 2,2-dimethylbutane, iso-octane) has shown the evolution in the development of porosity upon increasing gasification. This development is very uniform except for the narrow microporosity for which the widening predominates above 30% burn-off; for supermicropores, mesopores and macropores, their ratio to the total porosity is kept almost constant in the range 16-82% burn-off. Carbons with low burn-off exhibit a molecular sieve effect toward 2,2dimethylbutane and iso-octane and also present low pressure hysteresis for iso-octane; both characteristics disappear upon further gasification.