Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (10): 1194-1201.DOI: 10.11944/j.issn.1000-0518.2019.10.190007

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Effect of Hydrogen Sulfur on the Removal of Elemental Mercury with Activated Carbon

HONG Dongyang,ZHOU Jinsong(),ZHOU Qixin   

  1. State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China
  • Received:2019-01-09 Accepted:2019-05-29 Online:2019-10-01 Published:2019-09-29
  • Contact: ZHOU Jinsong
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51576173)

Abstract:

H2S is a component with sulfur in coal gas and it is worth studying whether activated carbon can catalyze the H2S in coal gas to form active sulfur, so as to promote the synergistic removal of H2S and Hg0. In this paper, the mechanism of H2S influence on the removal of Hg0 from activated carbon was analyzed by temperature programmed desorption method and thermodynamics. H2S significantly weakened the adsorption of activated carbon on Hg0 in low temperature, which may be caused by the consumption of adsorbed oxygen on the surface of activated carbon and the substitution of oxygen in oxygen containing functional groups by H2S. Then the feasibility of H2S in coal gas to remove Hg0 and H2S in high temperature was discussed. High temperature sulfuration cannot effectively sulfurize activated carbon with active sulfur. Therefore, mercury removal in the form of HgS with H2S as a sulfur source is not a feasible method by activated carbon. The mechanism revealed here in on the influence of H2S on Hg0 removal from pure activated carbon provides the guidance for designing activated carbon for gas mercury removal.

Key words: hydrgen sulfide, mercury, activated carbon, thermodynamics, temperature programmed desorption