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Citation: MAO Juezhen, ZHOU Jinsong, LI Xueqian, ZHOU Qixin, CAO Hui. Mechanism of Mercury Removal in Syngas by Co-modified Activated Coke with H2S[J]. Chinese Journal of Applied Chemistry, ;2018, 35(12): 1497-1506. doi: 10.11944/j.issn.1000-0518.2018.12.180016 shu

Mechanism of Mercury Removal in Syngas by Co-modified Activated Coke with H2S

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

  • Corresponding author: ZHOU Jinsong, zhoujs@zju.edu.cn
  • Received Date: 18 January 2018
    Revised Date: 1 March 2018
    Accepted Date: 12 March 2018

    Fund Project: Supported by the National Natural Science Foundation of China(No.51576173)the National Natural Science Foundation of China 51576173

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  • Activated coke modified with cobalt(Co-AC) were prepared through impregnation and high temperature calcination method, and then characterized by BET(Brunauer-Emmett-Teller), XRD(X-ray diffraction) analysis. The adsorption of gas-phase elemental mercury by Co-AC under nitrogen and simulated syngas(N2, H2, CO, H2S) was studied on a bench-scale fixed-bed apparatus and focus on the influence of H2S. The results show that 5%Co-AC exhibits excellent Hg0 removal capacity at 120℃ and 97.8% of Hg0 can be removed in the presence of H2S. In addition, based on the density functional theory, the adsorption energy and bond length of H2S, HS and S on Co3O4 (110) surface were calculated. Firstly, H2S will dissociate into HS and S in turn by comparing the bond length of H-S. Secondly the adsorption characteristic of Hg was calculated on S-Co3O4(110). The results indicate that Hg reacts with S to form a stable HgS with an adsorption energy of -3.503 eV and the adsorption of Hg follows Eley-Rideal mechanism.With an elevated temperature, mercury removal is suppressed, because the amount of active sulfurs on the surface decreases and the interaction between Hg and S is weakened. The reaction mechanism of Hg0 removal on the surface of cobalt-based adsorbents in the presence of H2S was proved. This provides a theoretical guidance for synergistic removal of H2S and Hg0 in coal gas.
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