Patent ID: 8133304

Claim:
A process for the production of carbonaceous adsorption agents doped with elementary sulfur for reversible mercury adsorption, comprising providing a mixture of sulfur and solid adsorption agent consisting of solid sulfur mixed with the solid adsorption agent, heating the mixture to a temperature of between 120° C. and 150° C. and the temperature is maintained over a period of between 0.5 and 1 hour, wherein heating of the mixture is effected under a controlled oxygen-bearing atmosphere wherein the oxygen content is set between 13 and 21% by volume and kept in the set range wherein surface oxides formed on said carbonaceous agent during said heating are in chemical equilibrium with said oxygen, wherein said adsorption agent is further characterized in that absorbed mercury does not chemically compound with said elementary sulfur thereby providing said reversible mercury adsorption wherein said carbonaceous adsorption agent can repeatedly absorb mercury at a temperature of between 60° C. and 120° C. and liberate mercury at a temperature of between 150° C. and 200° C.