Influence of HCl on oxidation of gaseous elemental mercury by dielectric barrier discharge process

Ko, Kyung Bo; Byun, Youngchul; Cho, Moo‐Hyun; Namkung, W.; Shin, Dong Ku; Koh, Dong Jun; Kim, Kyoung‐Tae

doi:10.1016/j.chemosphere.2008.01.015

Cited by 51 publications

(35 citation statements)

References 35 publications

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“…SO 2 and HCl also can enhance Hg 0 conversion (Figures S10 and S11). NO interferes Hg 0 oxidation because it competes with Hg 0 on reacting with oxidizing radicals (Jeong and Jurng, 2007;Ko et al, 2008aKo et al, , 2008cWang et al, 2009).…”

Section: Effect Of Particles In Flue Gasmentioning

confidence: 99%

“…There are three types of corona discharge: alternating current (AC), direct current (DC), and pulsed. Dielectric barrier discharge (DBD), a type of AC corona discharge, has been well studied as a Hg 0 oxidation technique (Chen et al, 2006;Jeong and Jurng, 2007;Byun et al, 2008Byun et al, , 2011aByun et al, , 2011bKo et al, 2008c;Lin et al, 2010;Wang et al, 2010;Jiang et al, 2012). Similarly, DC corona discharge (Liang et al, 2002;Wang et al, 2009Wang et al, , 2011aWang et al, , 2013a and pulsed corona discharge (Liang et al, 1998;Ko et al, 2008aKo et al, , 2008bXu et al, 2009) have also been used to oxidize Hg 0 .…”

Section: Introductionmentioning

confidence: 99%

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Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Wang

et al. 2014

Journal of the Air & Waste Management Association

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Corona discharge based techniques are promising approaches for oxidizing elemental mercury (Hg 0 ) in flue gas from coal combustion. In this study, in-situ soft X-rays were coupled to a DC (direct current) corona-based electrostatic precipitator (ESP). The soft X-rays significantly enhanced Hg 0 oxidation, due to generation of electrons from photoionization of gas molecules and the ESP electrodes. This coupling technique worked better in the positive corona discharge mode because more electrons were in the high energy region near the electrode. Detailed mechanisms of Hg 0 oxidation are proposed and discussed based on ozone generation measurements and Hg 0 oxidation behavior observations in single gas environments (O 2 , N 2 , and CO 2 ). The effect of O 2 concentration in flue gas, as well as the effects of particles (SiO 2 , TiO 2 , and KI) was also evaluated. In addition, the performance of a soft X-rays coupled ESP in Hg 0 oxidations was investigated in a lab-scale coal combustion system. With the ESP voltage at +10 kV, soft X-ray enhancement, and KI addition, mercury oxidation was maximized.Implications: Mercury is a significant-impact atmospheric pollutant due to its toxicity. Coal-fired power plants are the primary emission sources of anthropogenic releases of mercury; hence, mercury emission control from coal-fired power plant is important. This study provides an alternative mercury control technology for coal-fired power plants. The proposed electrostatic precipitator with in situ soft X-rays has high efficiency on elemental mercury conversion. Effects of flue gas conditions (gas compositions, particles, etc.) on performance of this technology were also evaluated, which provided guidance on the application of the technology for coal-fired power plant mercury control.

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Section: Effect Of Particles In Flue Gasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Wang

et al. 2014

Journal of the Air & Waste Management Association

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“…Among preoxidation technologies under development, advanced oxidation processes (AOPs) are receiving great emphasis on pollution control because of their ability to rapidly oxidize hazardous air pollutants [7,8]. Among the AOPs, non-thermal discharge plasmas (NTPs), which generate a large number of chemical active species such as ÁO and O 3 , have been developed as a new method applicable for processing waste gas [9,10], the removal of volatile organic compounds (VOCs) [11,12] and oxidizing Hg 0 [13][14][15][16][17]. NTP processes are highly effective in producing free radicals to enhance the removal of hazardous air pollutants.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Shang

Lü

et al. 2013

Plasma Chem Plasma Process

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A surface dielectric barrier discharge plasma reactor was employed to study Hg 0 oxidation in coal-fired flue gas. The experimental results showed that 98 % of Hg 0 oxidation efficiency and 13.7 lg kJ -1 of energy yield were obtained under a specific energy density (SED) of 7.9 J L -1 . Increasing SED was beneficial for Hg 0 oxidation due to higher production of active species. Higher initial concentration resulted in lower Hg 0 oxidation efficiency, but higher amount of Hg 0 oxidation. Water vapor inhibited Hg 0 oxidation because the generation of O 3 was suppressed. The presence of NO remarkably restrained Hg 0 oxidation, while SO 2 showed little effect on Hg 0 oxidation. Roles of active species in Hg 0 oxidation were examined under different gas atmospheres (O 2 and air), indicating that O 3 played an important role in Hg 0 oxidation. Deposits on the internal surface of the reactor were analyzed by energy dispersive spectroscopy and the product was identified as HgO.

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“…As the temperature increases, the reduced electric field (E/n) increases at a constant applied potential because the number density of the gas stream (n) decreases [45]. This results in higher electron energies and higher concentrations of active species [46].…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…This is because the presence of HCl inhibits Hg 0 adsorption on the catalyst, and HCl reacts with oxygen species preferentially [14,35,48], weakening the reaction of Hg 0 and the active oxygen in the plasma-catalysis process. At the same time, the presence of HCl in the gas mixture drives the formation of H, Cl and Cl 2 via processes such as the direct electron impact dissociation of HCl and the dissociation of HCl by N 2 ⁎ [45]. Cl and Cl 2 are effective for Hg 0 oxidation via surface-catalyzed reaction.…”

Section: Effect Of Hclmentioning

confidence: 99%

Plasma-induced adsorption of elemental mercury on TiO 2 supported metal oxide catalyst at low temperatures

Liu

Zheng

Chen

et al. 2015

Fuel Processing Technology

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Influence of HCl on oxidation of gaseous elemental mercury by dielectric barrier discharge process

Cited by 51 publications

References 35 publications

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Plasma-induced adsorption of elemental mercury on TiO 2 supported metal oxide catalyst at low temperatures

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