TY - JOUR
T1 - Reaction mechanism of calcium-catalyzed thermal regeneration of spent granular activated carbon
AU - Cannon, Fred S.
AU - Snoeyink, Vernon L.
AU - Lee, Ramon G.
AU - Dagois, Gerard
PY - 1994
Y1 - 1994
N2 - Thermal regenerations were conducted on a spent granular activated carbon (GAC) that had served in a water treatment plant for about four years and contained 1.8% calcium. Oxidation was conducted in steam, CO2, or steam plus CO2, at 650-950°C. As described earlier, when steam and CO2 were employed together, the regenerated product's pore structure maintained greater micropore volume at high temperatures ( > 800°C) than at low temperatures (<750°C). The work herein has linked this distinction to differences in reaction rate limitations: at high temperatures, with both oxidants employed together, the water-gas shift reaction (H2O + CO = H2 + CO2) limited overall rate, whereas at low temperatures, the C(O) gasification step limited overall rate. The CO2 created via the water gas shift reaction served as the primary oxidant. Although steam served only as a secondary oxidant, its presence also facilitated more extensive oxidant transfer to the carbon surface.
AB - Thermal regenerations were conducted on a spent granular activated carbon (GAC) that had served in a water treatment plant for about four years and contained 1.8% calcium. Oxidation was conducted in steam, CO2, or steam plus CO2, at 650-950°C. As described earlier, when steam and CO2 were employed together, the regenerated product's pore structure maintained greater micropore volume at high temperatures ( > 800°C) than at low temperatures (<750°C). The work herein has linked this distinction to differences in reaction rate limitations: at high temperatures, with both oxidants employed together, the water-gas shift reaction (H2O + CO = H2 + CO2) limited overall rate, whereas at low temperatures, the C(O) gasification step limited overall rate. The CO2 created via the water gas shift reaction served as the primary oxidant. Although steam served only as a secondary oxidant, its presence also facilitated more extensive oxidant transfer to the carbon surface.
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U2 - 10.1016/0008-6223(94)90114-7
DO - 10.1016/0008-6223(94)90114-7
M3 - Article
AN - SCOPUS:0028724135
SN - 0008-6223
VL - 32
SP - 1285
EP - 1301
JO - Carbon
JF - Carbon
IS - 7
ER -