A. Bagreev et al., Wood-based activated carbons as adsorbents of hydrogen sulfide: A study ofadsorption and water regeneration processes, IND ENG RES, 39(10), 2000, pp. 3849-3855
Wood-based carbon was studied as a hydrogen sulfide adsorbent in three adso
rption/regeneration cycles. The regeneration was done using a constant amou
nt of either hot or cold water. The performance of carbon and efficiency of
its regeneration were evaluated on the basis of the amount of hydrogen sul
fide adsorbed and on the selectivity of the carbon surface for oxidation of
H2S to sulfur oxides. The latter, as the products of surface reactions, ma
de the regeneration feasible. To check the effect of aging/surface oxidatio
n the tests were carried out on fresh and 3-year-stored carbon samples. The
results obtained showed that the surface of fresh carbon can be regenerate
d to some extent, whereas in the case-of aged materials the water regenerat
ion is inefficient due to the deposition bulky sulfur polymers resistant to
oxidation at temperatures up to 100 degrees C. Both hot and cold water tre
atment results in similar degree of regeneration of the carbon surface.