Used tires were pyrolyzed in a pilot-scale quasi-inert rotary kiln. Influences of variables, such as time, temperature, and agent flow, on the activation of obtained char were subsequently investigated in a laboratory-scale fixed bed. Mesoporous pores are found to be dominant in the pore structures of raw char. Brunauer-Emmett-Teller (BET) surfaces of activated chars increased linearly with carbon burnoff. The carbon burnoff of tire char achieved by carbon dioxide (CO2) under otherwise identical conditions was on average 75% of that achieved by steam, but their BET surfaces are almost the same. The proper activation greatly improved the aqueous adsorption of raw char, especially for small molecular adsorbates, for example, phenol from 6 mg/g to 51 mg/g. With increasing burnoff, phenol adsorption exhibited a first-stage linear increase followed by a rapid drop after 30% burnoff. Similarly, iodine adsorption first increased linearly, but it held as the burnoff exceeded 40%, which implied that the reduction of iodine adsorption due to decreasing micropores was partially made up by increasing mesopores. Both raw chars and activated chars showed appreciable adsorption capacity of methylene-blue comparable with that of commercial carbons. Thus, tire-derived activated carbons can be used as an excellent mesoporous adsorbent for larger molecular species.
Properties of pyrolytic chars and activated carbons derived from pilot-scale pyrolysis of used tires
Journal of the Air and Waste Management Association ; 55 , 9 ; 1315-1326
2005
12 Seiten, 46 Quellen
Article (Journal)
English
Plasticizing properties of heavy oils obtained from vacuum pyrolysis of used tires
Automotive engineering | 1996
|Preferred orientation parameters for pyrolytic carbons.
NTRS | 1966
|Thermal plasma pyrolysis of used tires for carbon black recovery
Tema Archive | 2005
|Adsorption of hydrogen on activated carbons derived from polyvinylidene chloride
Tema Archive | 2000
|