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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2024, Vol. 18 Issue (3) : 32    https://doi.org/10.1007/s11705-024-2396-2
Impact of H2S on Hg0 capture performance over nitrogen-doped carbon microsphere sorbent: experimental and theoretical insights
Guopei Zhang1, Xiaoyang Zhang2(), Xiangwen Xing1, Xiangru Kong1, Lin Cui1, Dong Yong1()
1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Shandong University, Jinan 250061, China
2. Bingtuan Energy Development Institute, Shihezi University, Shihezi 832000, China
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Abstract

A nitrogen-doped carbon microsphere sorbent with a hierarchical porous structure was synthesized via aggregation-hydrothermal carbonization. The Hg0 adsorption performance of the nitrogen-doped carbon microsphere sorbent was tested and compared with that of the coconut shell activated carbon prepared in the laboratory. The effect of H2S on Hg0 adsorption was also investigated. The nitrogen-doped carbon microsphere sorbent exhibited superior mercury removal performance compared with that of coconut shell activated carbon. In the absence of H2S at a low temperature (≤ 100 °C), the Hg0 removal efficiency of the nitrogen-doped carbon microsphere sorbent exceeded 90%. This value is significantly higher than that of coconut shell activated carbon, which is approximately 45%. H2S significantly enhanced the Hg0 removal performance of the nitrogen-doped carbon microsphere sorbent at higher temperatures (100–180 °C). The hierarchical porous structure facilitated the diffusion and adsorption of H2S and Hg0, while the nitrogen-containing active sites significantly improved the adsorption and dissociation capabilities of H2S, contributing to the generation of more active sulfur species on the surface of the nitrogen-doped carbon microsphere sorbent. The formation of active sulfur species and HgS on the sorbent surface was further confirmed using X-ray photoelectron spectroscopy and Hg0 temperature-programmed desorption tests. Density functional theory was employed to elucidate the adsorption and transformation of Hg0 on the sorbent surface. H2S adsorbed and dissociated on the sorbent surface, generating active sulfur species that reacted with gaseous Hg0 to form HgS.

Keywords nitrogen-doped carbon microsphere      H2S      Hg0 removal      adsorption mechanism     
Corresponding Author(s): Xiaoyang Zhang,Dong Yong   
Just Accepted Date: 21 December 2023   Issue Date: 07 February 2024
 Cite this article:   
Guopei Zhang,Xiaoyang Zhang,Xiangwen Xing, et al. Impact of H2S on Hg0 capture performance over nitrogen-doped carbon microsphere sorbent: experimental and theoretical insights[J]. Front. Chem. Sci. Eng., 2024, 18(3): 32.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2396-2
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I3/32
Fig.1  Scheme of the experimental system for elemental mercury removal.
Fig.2  (a) FT-IR spectra; (b) N2 adsorption-desorption isotherms and pore size distribution of NCM and AC; (c, d) SEM images of NCM.
SampleSBET/(m2·g?1)Smic/(m2·g?1)Micropore content/%Vtot/(cm3·g?1)Dave/nm
NCM68342462.10.2711.59
AC66060591.60.2741.61
Tab.1  Physical properties of NCM and AC
Fig.3  XPS spectra: (a) overall XPS spectra of NCM and AC; (b) C 1s spectra of NCM; (c) N 1s spectra of NCM; (d) O 1s spectra of NCM.
Fig.4  (a) Average Hg0 removal efficiency, (b) instantaneous Hg0 removal efficiency of NCM at different temperatures, and (c) the effect of H2S on instantaneous Hg0 removal efficiency at 60 and 140 °C.
Fig.5  Comparison of Hg0 removal efficiency of NCM with AC.
Fig.6  Hg0 removal efficiency over NCM and AC with and without adding H2S.
Fig.7  XPS patterns of (a) S 2p and (b) Hg 4f for fresh and spent NCM; (c) Hg0-TPD curves of spent NCM.
Fig.8  Hg0 chemisorption complexes for (a) AC surface and (b) NCM, where gray ball represnets carbon atom, red ball represents oxygen atom, blue ball represents nitrogen atom, small white ball represents hydrogen atom, and light blue ball represents mercury atom.
Fig.9  (a) Geometrical diagram and (b) energy profiles of H2S reaction with Hg0 over AC and NCM, where gray ball represents carbon atom, red ball represents oxygen atom, blue ball represents nitrogen atom, yellow ball represents sulfur atom, small white ball represents hydrogen atom, and light blue ball represents mercury atom.
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