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Regeneration of powdered activated carbon. Part II: Steam‐carbon reaction kinetics
Author(s) -
Chihara Kazuyuki,
Matsui Isao,
Smith J. M.
Publication year - 1981
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690270208
Subject(s) - activated carbon , adsorption , carbon fibers , chemistry , kinetics , chemical engineering , volume (thermodynamics) , activation energy , langmuir , materials science , thermodynamics , organic chemistry , composite material , physics , quantum mechanics , composite number , engineering
The kinetics of the reaction between steam and spent activated carbon (from sucrose deposition) was studied at 1003 to 1123 K and 1 atm pressure. At these conditions some virgin carbon, upon which the sucrose was originally adsorbed, was also gasified. Rates of oxidation were essentially the same for spent and virgin activated carbon. The kinetics data fit a Langmuir‐Hinshelwood equation, originally proposed for gasification of other types of carbon, with an activation energy of 2.3 × 10 5 J/mol. Surface area and pore volume measurements indicated that the adsorption capacity of the original carbon could be completely restored by thermal regeneration followed by reaction with steam. However, some activated carbon is lost implying that there would be an optimum extent of steam gasification in a cyclical adsorption‐regeneration process.