Mechanism of the Reducing Desorption of Sulfur Dioxide
from Carbon Adsorbents in a Hydrogen Flow

S. A. Anurov

Mendeleev University of Chemical Engineering, Miusskaya pl. 9, Moscow, 125047 Russia

Received June 10, 1996

Abstract—The reducing desorption of sulfur dioxide in a hydrogen flow from carbon adsorbents doped with
ions of heavy metals (Fe, Co, Mn, Cu, Mo, Ni, V, Cr) was studied. The temperature barriers of the complete
desorption of sulfur dioxide and the influence of the activator nature were revealed. The cyclic operation of
adsorbents was examined in the process of SO₂ adsorption–regeneration in the hydrogen flow, and the evolving
gas phase was chemically analyzed. It was shown that the reducing regeneration (with the aid of H₂) of the car-
bon adsorbents saturated by sulfur dioxide does not allow a decrease of the consumption of structural carbon
for the adsorbate reduction, which leads to a gradual destruction of the porous structure of adsorbents, to the
loss of their mechanical strength, and, as a consequence, to a decrease in their adsorption capacity with respect
to SO₂. Thermal desorption of sulfur dioxide in the H₂ flow without gasification of carbon can be effected only
for the adsorbents modified with ions of copper and vanadium. The chemical flow sheet of the reducing desorp-
tion of SO₂ is proposed.

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