Structural effect of the in situ generated titania on its ability to oxidize and capture the gas-phase elemental mercury

Lee, Tai Gyu; Hyun, Jung Eun

doi:10.1016/j.chemosphere.2005.04.048

Cited by 29 publications

(15 citation statements)

References 29 publications

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“…The inlet Hg 0 concentration was maintained at 5 mg/m 3 . As previously reported (Wu et al 1998;Lee et al 2001;Lee and Hyun 2006), Hg 0 was very effectively removed (>80%) up to the highest tested photochemical reaction temperature of 160 C, the typical temperature range (150-200 C) of the flue gas entering the electrostatic precipitator (ESP) in coal combustors, considering the utilization of the ESP corona as a potential source of UV irradiation.…”

Section: Introductionmentioning

confidence: 69%

“…2 In Situ Generated TiO 2 by Gas-Phase Ti Precursor Injection A novel methodology using in situ generated TiO 2 from gas-phase Ti precursor with UV has been proposed and tested for the capture of Hg 0 in a combustion flue gas (Wu et al 1998;Lee et al 2001;Lee and Hyun 2006). The gas-phase Ti precursor enters the combustor and is readily oxidized to form sorbent particles.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the reaction between the in situ generated TiO 2 and Hg 0 has been previously reported. The positive holes may result in OH radicals formation by adsorption of O 2 or H 2 O, which then oxidize the mercury, thus creating a lower volatile form (HgO) that is retained on titania particle surface (Linsebigler et al 1995;Wu et al 1998;Lee et al 2001;Lee and Hyun 2006):…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Removal of Gas-Phase Elemental Mercury Using TiO2

Lee

2010

Nanostructure Science and Technology

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A photochemical reaction by TiO 2 under UV irradiation has been proven to be a very promising technology for effective removal of air contaminants. However, because of UV's high operating cost and harmfulness to humans, many researchers have been looking for alternative ways to activate the photocatalyst. For example, chemical doping enabled a modified TiO 2 to activate under visible light, however, so far, with a relatively low photoreactivity in most cases. Recently, various types of TiO 2 photochemical reactor systems with different light sources have been tested to oxidize/remove elemental mercury (Hg 0 ) from a simulated combustion flue gas. Notably, the photochemical removal of Hg 0 by pure TiO 2 under visible light (410-510 nm) was proven to be as highly effective as UV light. The results suggest that upon irradiation by visible light, TiO 2 may be used to selectively remove gas-phase Hg 0 among other air contaminants (those that usually suffer from low photoreactivity even under the strongest UV light) from combustion flue gas.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Removal of Gas-Phase Elemental Mercury Using TiO2

Lee

2010

Nanostructure Science and Technology

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“…The sorbent injection rate is usually expressed as pounds of sorbent per million actual cubic feet of flue gas (lb/MMacf). For a 500-MW boiler, a sorbent rate of 1.0 lb/MMacf corresponds to ~120 lb/h of sorbent [42].…”

Section: Sorbent Injectionmentioning

confidence: 99%

A review of elemental mercury removal processing

Bae¹,

Kim²,

Park³

2011

Carbon letters

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Public concern has recently increased over the potential risk of toxic elements emitted from anthropogenic sources. Among these, mercury has drawn special attention owing to its increasing level of bioaccumulation in the environment and in the food chain, with potential risks for human health. This paper presents an overview of research related to mercury control technology and identifies areas requiring additional research and development. It critically reviews measured mercury emissions progress in the development of promising control technologies, including catalytic oxidation, sorbent injection, photochemistry oxidation, and air pollution control devices.

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“…Conversely, elemental mercury is very difficult to be removed because of its high vapor pressure and low water solubility. Thus, control of elemental mercury should be the focus of mercury emissions from coal-fired power plants since it is the most difficult species to be eliminated [13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: +mentioning

confidence: 99%

Overlook of carbonaceous adsorbents and processing methods for elemental mercury removal

Bae¹,

Kim²,

Park³

2014

Carbon letters

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People have been concerned about mercury emissions for decades because of the extreme toxicity, persistence, and bioaccumulation of methyl Hg transformed from emitted Hg. This paper presents an overview of research related to mercury control technology and identifies areas requiring additional research and development. It critically reviews measured mercury emissions progress in the development of promising control technologies. This review provides useful information to scientists and engineers in this field.

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Structural effect of the in situ generated titania on its ability to oxidize and capture the gas-phase elemental mercury

Cited by 29 publications

References 29 publications

Photocatalytic Removal of Gas-Phase Elemental Mercury Using TiO2

Photocatalytic Removal of Gas-Phase Elemental Mercury Using TiO2

A review of elemental mercury removal processing

Overlook of carbonaceous adsorbents and processing methods for elemental mercury removal

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