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HGR is an activated carbon that is impregnated with sulphur to adsorp mercury from air, natural gas and its by product hydrogen streams. Its structure is made so that it can have a high loadings and at the same time allow the gaseous streams to flow through it, reducing pressure loss. Removal is through using single or dual adsorption columns to reduce the concentration of mercury to 0.01 µg/NM3. Contact by the mercury vapour in the pores of the activated converts to mercuric sulphide. The loading can be as high as 30%. Calgon carbon can design adsorbtion streams up to 122°F and 99 RH.