Synthesis of a high-yield activated carbon by air gasification of macadamia nut shell charcoal

Authors
Citation
Xf. Dai et Mj. Antal, Synthesis of a high-yield activated carbon by air gasification of macadamia nut shell charcoal, IND ENG RES, 38(9), 1999, pp. 3386-3395
Citations number
26
Categorie Soggetti
Chemical Engineering
Journal title
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN journal
08885885 → ACNP
Volume
38
Issue
9
Year of publication
1999
Pages
3386 - 3395
Database
ISI
SICI code
0888-5885(199909)38:9<3386:SOAHAC>2.0.ZU;2-I
Abstract
Macadamia nut shell charcoal was heated in an inert environment to temperat ures above 1000 K ("carbonized"), reacted with oxygen (P-O2 = 2.68-11.3 kPa ) at temperatures between 525 and 586 K ("oxygenated"), and heated again in an inert environment to temperatures above 1000 K ("activated") to produce an activated carbon, Carbons produced by this process possess surface area s and iodine numbers in the range of 400-550. Overall yields of these carbo ns (based on the dry, raw macadamia nut shell feed) ranged from 24 to 30 wt %. Under the conditions employed in this work, the rates of chemisorption and gasification were not mass transfer limited. Initially, the gasificatio n reaction was first-order with respect to oxygen concentration but became independent of oxygen concentration as the surface sites of the carbon beca me saturated with oxygen.