Abstract
A series of sorbents based on biomass-derived porous carbon-supported CuCl2 (CuCl2-PC) were synthesized and employed for elemental mercury (Hg0) removal from the syngas. The CuCl2-PC sorbent with a Cu mass content of 5.6 wt% exhibited superior Hg0 adsorption ability (98.5%) at 200 °C. The meso-/micropores structure of porous carbon is favorable for the well-dispersing of CuCl2 in the inner pores with the formations of abundant Cu and Cl active sites, and beneficial for Hg0 fast transfer among pores, thereby enhancing the effective collision of Hg0 with active sites. Hg-Cu compound and mercury chlorides could be formed by the reactions of Hg0 with Cu and Cl species. The effects of syngas components on Hg0 adsorption ability of sorbent were investigated. HCl improved Hg0 adsorption by increasing the Cl concentration on sorbent surface. CO, H2S and H2O did not exhibit notable effects on Hg0 adsorption. Although H2 could not affect the surface chemistry of sorbent, it could occupy the inner pores of sorbent, thereby making the interactions of Hg0 with active sites difficult. The amount of Cu2+ on sorbent surface decreased after Hg0 adsorption, indicating that the oxidation state of copper changed from Cu2+ to Cu+ under syngas atmosphere.
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