Adsorptive removal of gas-phase mercury by oxygen non-thermal plasma modified activated carbon

Zhang, Jun; Duan, Yufeng; Zhou, Qiang; Zhu, Chun; She, Min; Ding, Weike

doi:10.1016/j.cej.2016.02.002

Cited by 151 publications

(91 citation statements)

References 38 publications

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“…pseudo-second order kinetic (2) where q e and q t are the adsorption capacity of Hg 0 on the sorbents at equilibrium, and at reaction time t (min), respectively. The parameters k 1 (min −1 ) and k 2 (g/(µg·min)) are the rate constants of the pseudo-first order, and pseudo-second order models, respectively.…”

Section: Models Of Adsorption Kineticsmentioning

confidence: 99%

“…Hg 0 capture with specific adsorbents is a usual way to control Hg 0 emissions from coal-fired power plants [1]. Activated cabon (AC) has been widely used for the adsorption of Hg 0 in coal-fired flue gas [2,3]. However, a huge amount of AC needs to be injected into flue gas because of its low Hg 0 capture capacity, which leads to a high operating cost of this technology.…”

Section: Introductionmentioning

confidence: 99%

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Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Zhang

Han

et al. 2020

Catalysts

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Sorbent of αMnO2 nanorods coating TiO2 shell (denoted as αMnO2-NR@TiO2) was prepared to investigate the elemental mercury (Hg0) removal performance in the presence of SO2. Due the core-shell structure, αMnO2-NR@TiO2 has a better SO2 resistance when compared to αMnO2 nanorods (denoted as αMnO2-NR). Kinetic studies have shown that both the sorption rates of αMnO2-NR and αMnO2-NR@TiO2, which can be described by pseudo second-order models and SO2 treatment, did not change the kinetic models for both the two catalysts. In contrast, X-ray photoelectron spectroscopy (XPS) results showed that, after reaction in the presence of SO2, S concentration on αMnO2-NR@TiO2 surface is lower than on αMnO2-NR surface, which demonstrated that TiO2 shell could effectively inhibit the SO2 diffusion onto MnO2 surface. Thermogravimetry-differential thermosgravimetry (TG-DTG) results further pointed that SO2 mainly react with TiO2 forming Ti(SO4)O in αMnO2-NR@TiO2, which will protect Mn from being deactivated by SO2. These results were the reason for the better SO2 resistance of αMnO2-NR@TiO2.

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Section: Models Of Adsorption Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Zhang

Han

et al. 2020

Catalysts

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“…The H 2 S can be oxidized to elemental S by the O 2 or SO 2 on the surface of activated carbon, and then HgS can be formed through reaction between element S and Hg 0 . Reactions (15) to (17) provide a probable mechanism in HgS formation [50]. Other mechanisms may also exist.…”

Section: Influence Of Heating Time On Hg Decompositionmentioning

confidence: 99%

“…As a result, Hg 21 and Hg p are carried by coal utilization by-products, such as desulfurization gypsum and fly ash. The emissions standards of Hg in the current world are used to limit emission of the gas mercury, therefore, activated carbon adsorption is a technology that offers a great potential for the control of gas-phase mercury emissions [13][14][15][16]51]. However, some crucial drawbacks, such as high carbon-to-mercury ration, poor adsorption capacity and high cost, constrain wide application of this technology [17,18].…”

Section: Introductionmentioning

confidence: 99%

Species and thermal stability of mercury captured by fly ashes

Gao

Ding

Han

et al. 2016

Env Prog and Sustain Energy

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Samples of fly ash were obtained from four boilers in China. The unburned carbon content, mercury concentrations, and mean ash particle size were measured. The ashes were heated at seven different temperatures, and the mercury released from the heated ashes was determined. The mercury species in the ashes were analyzed. The correlation between the mercury captured by ash and the carbon in ash was determined. The ratio of Hg to ash has an important role in particulate Hg formation. The high Cl content in coal does not absolutely result in the capture of more mercury by ash, but can result in high HgCl2 ratio in particulate mercury. The HgO ratios are low, and the HgSO4 ratios of all the ashes are negligible. The sulfur in coal is an important factor in the sorption of mercury by fly ash, and the high S content in coal results in a high HgS ratio in ash. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 460–467, 2017

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“…For this reason, adsorption and plasma catalytic technology (APC) has been proposed and explored recently. Briefly, VOCs are first adsorbed and then oxidized by PC . The material is first used as an adsorbent and then oxidizes VOCs as catalyst in the discharge stage.…”

Section: Introductionmentioning

confidence: 99%

Removal of toluene from industrial gas over 13X zeolite supported catalysts by adsorption‐plasma catalytic process

Yang

Tang

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: To find an appropriate catalyst in the adsorption plasma catalytic process, degradation of toluene over 13X zeolite supported catalysts were studied. RESULTS: 13X zeolite exhibited excellent toluene adsorption capacity but weak catalytic ability. After loading Cu, Co, Ce and Mg active compounds by the impregnation method, adsorption capacity was reduced and catalytic performance was significantly improved. Co/13X exhibited good adsorption capacity and excellent catalytic performance, which carbon balance was 81.6% with 74.4% of CO x for toluene adsorption capacity of 0.51 mmol. The effect of cobalt loading and calcination temperature on Co/13X for toluene degradation were studied, and it was found that 5% and 500 ∘ C were the optimum loading value and calcination temperature. The characterization results of BET, FTIR, XRD, XPS and SEM were correlated with catalyst performance. CONCLUSIONS: The active compounds block the pores and reduce the specific surface area of 13X zeolite, but active sites of catalysts can decompose ozone to produce more atomic oxygen species. Co 3+ could form -complexation bonding with toluene and Co 3 O 4 is a P-type semiconductor, which has large oxygen adsorption capacity and converts oxygen into O − and O 2− easily. Co 3 O 4 present in Co/13X is the active point for toluene degradation by adsorption and plasma catalytic activity.

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Adsorptive removal of gas-phase mercury by oxygen non-thermal plasma modified activated carbon

Cited by 151 publications

References 38 publications

Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Species and thermal stability of mercury captured by fly ashes

Removal of toluene from industrial gas over 13X zeolite supported catalysts by adsorption‐plasma catalytic process

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