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

doi:10.11944/j.issn.1000-0518.2019.10.190007

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

State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China

Received:2019-01-09 Accepted:2019-05-29 Published:2019-10-01 Online:2019-09-29
Contact: ZHOU Jinsong
Supported by:
Supported by the National Natural Science Foundation of China(No.51576173)

Abstract

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

HONG Dongyang, ZHOU Jinsong, ZHOU Qixin. Effect of Hydrogen Sulfur on the Removal of Elemental Mercury with Activated Carbon[J]. Chinese Journal of Applied Chemistry, 2019, 36(10): 1194-1201.

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

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