Adsorption and catalytic oxidation of elemental mercury over regenerable magnetic Fe Ce mixed oxides modified by non-thermal plasma treatment

Xu, Yang; Luo, Guangqian; Pang, Qicong; He, Shuangwu; Deng, Fangfang; Xu, Yongqing; Yao, Hong

doi:10.1016/j.cej.2018.10.145

Cited by 84 publications

(33 citation statements)

References 59 publications

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“…The downward trend was further slowed down, and the average mercury removal efficiency was also further increased to 94.2%, indicating that O 2 plays a positive role in the removal of Hg 0 . It can provide abundant active oxygen, and supplement the lattice oxygen consumed in the adsorption process or chemically adsorbed oxygen, thereby promoting the Hg 0 removal process [6,33,37,38]. However, when the O 2 volume fraction was further increased to 15%, the Hg 0 removal efficiency was basically not improved, indicating that 10% O 2 is sufficient to regenerate the lattice oxygen or chemisorption oxygen consumed on the surface.…”

Section: Influence Of Flue Gas Components On the Performance Of Mercury Removal Impact Of Omentioning

confidence: 99%

“…showed a downward trend with the extension of the reaction troduced into the atmosphere, the downward trend of mercu obviously curbed. The average mercury removal efficiency wa 91.1%, and the volume fraction of O2 continued to increase to was further slowed down, and the average mercury removal increased to 94.2%, indicating that O2 plays a positive role in provide abundant active oxygen, and supplement the lattice o sorption process or chemically adsorbed oxygen, thereby prom cess [6,33,37,38]. However, when the O2 volume fraction was fu Hg 0 removal efficiency was basically not improved, indicating regenerate the lattice oxygen or chemisorption oxygen consum…”

Section: Influence Of Flue Gas Components On the Performance Of Mercury Removal Impact Of Omentioning

confidence: 99%

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Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

Huang

Zhong

et al. 2021

Separations

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In this study, the manganese-doped manganese–cobalt–iron spinel was prepared by the sol–gel self-combustion method, and its physical and chemical properties were analyzed by XRD (X-ray diffraction analysis), SEM (scanning electron microscope), and VSM (vibrating sample magnetometer). The mercury removal performance of simulated flue gas was tested on a fixed bed experimental device, and the effects of Mn doping amount, fuel addition amount, reaction temperature, and flue gas composition on its mercury removal capacity were studied. The results showed that the best synthesized product was when the doping amount of Mn was the molar ratio of 0.5, and the average mercury removal efficiency was 87.5% within 120 min. Among the fuel rich, stoichiometric ratio, and fuel lean systems, the stoichiometric ratio system is most conductive to product synthesis, and the mercury removal performance of the obtained product was the best. Moreover, the removal ability of Hg0 was enhanced with the increase in temperature in the test temperature range, and both physical and chemical adsorption play key roles in the spinel adsorption of Hg0 in the medium temperature range. The addition of O2 can promote the removal of Hg0 by adsorbent, but the continuous increase after the volume fraction reached 10% had little effect on the removal efficiency of Hg0. While SO2 inhibited the removal of mercury by adsorbent, the higher the volume fraction, the more obvious the inhibition. In addition, in an oxygen-free environment, the addition of a small amount of HCl can promote the removal of mercury by adsorbent, but the addition of more HCl does not have a better promotion effect. Compared with other reported adsorbents, the adsorbent has better mercury removal performance and magnetic properties, and has a strong recycling performance. The removal efficiency of mercury can always be maintained above 85% in five cycles.

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Section: Influence Of Flue Gas Components On the Performance Of Mercury Removal Impact Of Omentioning

confidence: 99%

Section: Influence Of Flue Gas Components On the Performance Of Mercury Removal Impact Of Omentioning

confidence: 99%

Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

Huang

Zhong

et al. 2021

Separations

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“…Plasma modification is a kind of cheap and green physical modification, which is carried out at room temperature by the reaction of active substances produced by gas ionization. [13][14] Plasma is the fourth state of matter, which is composed of ions, electrons, excited state molecules, free radicals and other active particles. [15] Artificially produced plasma in laboratory or industry is usually produced by electrons accelerated by electric field.…”

Section: Introductionmentioning

confidence: 99%

Non-Thermal Oxygen-Helium Plasma Modification and Regeneration of Sawdust Biochar to Promote Aniline Removal

Zhang¹,

Yu²,

Wang³

2022

ES Energy Environ.

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The pollutant adsorption performance of produced biochar could be dramatically improved by low-energy cost plasma technology. Non-thermal oxygen-helium plasma was proposed to modify and regenerate sawdust biochar by enhancing oxygen-containing functional groups on the surface of biochar. The effect of discharge gas, discharge time, carrier gas flow rate and discharge power on the product's performance for aniline removal were investigated in detail. Scanning electron microscope (SEM) analysis showed that plasma treatment could etch the surface of biochar and form pits. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and elemental analysis showed that the oxygen content of the modified biochar increased from 20.15% to 23.88%, and more oxygen-containing functional groups were formed on the surface. After the oxygen-helium non-thermal plasma modification, the aniline adsorption capacity of the biochar increased by about 23.5%. Meanwhile, water vapor was introduced into the plasma regeneration system. The regeneration ratio maintained at 80% after ten times of regeneration, which was much higher than the thermal regeneration ratio of 55.28%. It was speculated that the adsorption mechanism was that the amino group of aniline forms a hydrogen bond with a carbonyl group and a carboxyl group, and the carbonyl group forms an electron donor-acceptor structure with the aromatic ring of aniline.

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“…Mercury is a toxic air pollutant with high volatility, and is harmful to human health and ecosystem [1][2][3][4][5]. Thermal power plant is considered to be a main source of gaseous anthropogenic mercury emissions in China [6][7][8]. The Minamata Convention on Mercury has officially come into force in August 2017 to restrict the global anthropogenic mercury emissions [9].…”

Section: Introductionmentioning

confidence: 99%

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Zhang¹,

Yang²,

Jing³

et al. 2022

Energy Engineering

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CuMn 2 O 4 spinel has been regarded as a highly efficient sorbent for Hg 0 capture from flue gas. The regenerability and recyclability of CuMn 2 O 4 sorbent are mainly associated with the mercury speciation adsorbed on its surface. However, the effect mechanism of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent is still elusive. Experiments were conducted to understand the effect of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent. The results indicate that CuMn 2 O 4 sorbent is a mesoporous material and possesses a good thermal stability. CuMn 2 O 4 shows >95% Hg 0 removal efficiency in a wide temperature window of 50-350 • C. The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg 0 removal performance of CuMn 2 O 4 sorbent. CuMn 2 O 4 shows a higher Hg 0 adsorption capacity of 4774.57 μg/g. Hg 0 adsorption process over CuMn 2 O 4 sorbent can be well described by the developed kinetic model. Hg 0 removal efficiency of CuMn 2 O 4 sorbent does not depend on the presence of HCl. Mercury species adsorbed on the CuMn 2 O 4 sorbent in the presence of HCl mainly exist in the forms of HgO and HgCl 2 O 8 • H 2 O. HCl shows a significant effect on mercury speciation over CuMn 2 O 4 sorbent. Most of HgO species will be transformed into HgCl 2 O 8 • H 2 O in the presence of HCl.

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Adsorption and catalytic oxidation of elemental mercury over regenerable magnetic Fe Ce mixed oxides modified by non-thermal plasma treatment

Cited by 84 publications

References 59 publications

Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

Non-Thermal Oxygen-Helium Plasma Modification and Regeneration of Sawdust Biochar to Promote Aniline Removal

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

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