Effect of water vapor on adsorption of methyl iodide to triethylenediamine-impregnated activated carbons

Park, Seong Won; Park, Hyun Soo; Lee, Won Kook; Moon, Hee

doi:10.1016/0956-9618(94)00104-z

Cited by 38 publications

(21 citation statements)

References 14 publications

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“…The chemicals used to prepare aqueous impregnating solutions were copper nitrate trihydrate (Cu(NO 3 The chemicals used to prepare ammoniacal impregnating solutions were basic copper carbonate (Cu 2 CO 3 (OH) 2 ), ammonium carbonate ((NH 4 ) 2 CO 3 ), ammonium molybdate ((NH 4 ) 2 Mo 2 O 7 ) and ammonium sulfate ((NH 4 ) 2 SO 4 ). These materials were dissolved in an approximately 0.85:1 ammonium hydroxide and distilled water solution.…”

Section: Chemicals Usedmentioning

confidence: 99%

“…Treating the AC substrate with nitric acid (HNO 3 ) was found to improve impregnant distribution and increase gas filtration capacity. Cu(NO 3 ) 2 , HNO 3 and phosphomolybdic acid (H 3 PO 4 ·12MoO 3 ) were combined to form an aqueous impregnating solution capable of impregnating the AC substrate in a simple and efficient manner. This impregnating solution and appropriate heat treatments produced IACs capable of filtering SO 2 , NH 3 and HCN gases at levels comparable to IAC samples prepared from ammoniacal impregnating solutions described in the literature [9].…”

Section: Introductionmentioning

confidence: 99%

“…Cu(NO 3 ) 2 , HNO 3 and phosphomolybdic acid (H 3 PO 4 ·12MoO 3 ) were combined to form an aqueous impregnating solution capable of impregnating the AC substrate in a simple and efficient manner. This impregnating solution and appropriate heat treatments produced IACs capable of filtering SO 2 , NH 3 and HCN gases at levels comparable to IAC samples prepared from ammoniacal impregnating solutions described in the literature [9]. The thermal stability of the IACs prepared in this study was compared to commercially available IAC samples using oven tests to simulate storage at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Impregnated activated carbon (IAC) has the capability to filter gases that cannot be filtered by virgin activated carbon [1][2][3][4][5][6][7]. Individuals in high-risk professions such as first responders or military personnel may be deployed in situations where an unknown toxin is present in the air.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The investigation of copper-based impregnated activated carbons prepared from water-soluble materials for broad spectrum respirator applications

Smith

Westreich

Abdel-Latif

et al. 2010

Journal of Hazardous Materials

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Section: Chemicals Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The investigation of copper-based impregnated activated carbons prepared from water-soluble materials for broad spectrum respirator applications

Smith

Westreich

Abdel-Latif

et al. 2010

Journal of Hazardous Materials

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“…Furthermore, the research usually focuses on the removal of only one specific gas. Adsorption tests are performed only with the gas for which the impregnant is intended [24][25][26], and they are often performed at only one condition of relative humidity. This may be well suited for filtering applications in which only one gas, such as sulfur dioxide, or one gas type, such as acidic, basic or organic, is to be adsorbed, but it is insufficient for applications in which more than one gas type is to be trapped.…”

Section: Introductionmentioning

confidence: 99%

Ammonia, cyclohexane, nitrogen and water adsorption capacities of an activated carbon impregnated with increasing amounts of ZnCl2, and designed to chemisorb gaseous NH3 from an air stream

Fortier

Westreich

Selig

et al. 2008

Journal of Colloid and Interface Science

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Mechanism of selenium sorption by activated carbon

Jadhav¹,

Agnihotri²,

Gupta³

et al. 2000

Can J Chem Eng

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USAoal combustion, waste incineration as well as glass manufacturing generates hot flue gases containing selenium species. Selenium C is one of the most volatile trace elements in coal, and a signlficant portion of it escapes to atmosphere in vapour form (Linak and Wendt, 1993; Martinez-Tarazona and Spears, 1996). A substantial amount of selenium in the flue gas remains in the gas phase and its distribution between the vapour and condensed form depends on various factors such as initial concentration in the parent coal, design and operating conditions of the combustor facility, and the particulate control devices. Cermani and Zoller (1 988) reported an average of 59% of the in-stack Se to be in the form of vapour and its concentration in the vapour phase to be about 25 pg/m3. Mercury and the halogens are the only other elements that exhibit such high affinity for gas phase.Despite the fact that Se is an essential trace element for humans and other animals, selenium and its compounds have been linked to harmful toxicological impacts (Marshall, 1986; Oehm et al., 1991). The major sources of selenium and other trace metal emissions are the coal-fired power plants and utility boilers and these will most likely be required to reduce these emissions by impending EPA regulations. In an estimate, 62% of industrial selenium emission has beem linked to coal-fired power plant emissions (Sarquis and Mickey, 1980). Average selenium content of US. coal is reported as 4 ppm.The chemical state in which selenium exists in the flue gas has been a subject of intense controversy and speculation. Selenium exhibits -2, 0, +2, 4, and +6 as its possible oxidation states and is similar to sulfur in most of its chemistry. The elemental selenium and the oxide form (SeO,) have been postulated to be the two most probable species. Andren et al.(1 975) postulated that the SO, produced during coal combustion could act as a reducing agent to yield elemental Se from SeO, . Davison et al. (1974), on the other hand, concluded from the thermodynamic data that it is Se0, that escapes to the atmosphere, and at 25'C as much as 80 pg/m3 of Se can exist as SeO, . Later studies (Dismukes, 1994) indicate that selenium exists as SeO, for almost the entire course of its stay in the combustion environment, but at the lower temperature of the stack could be partially reduced to Se by the presence of SO, .Due to its high volatility and its existence in the form of vapour, selenium emission control is a very difficult and challenging task. A possible methodology of selenium control could involve reduction in the operating temperature of the stack in order to enhance condensation of the vapour and hence metal removal; however, the resulting loss In buoyancy of the stack emission eliminates this as a feasible technique. Improving performance of the particulate control device can lead to better capture of the finer metal aerosols, but it fails to control the emissions in vapour form. In the past few years, dry sorbent injection for 'Author towhom correspondme m...

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Effect of water vapor on adsorption of methyl iodide to triethylenediamine-impregnated activated carbons

Cited by 38 publications

References 14 publications

The investigation of copper-based impregnated activated carbons prepared from water-soluble materials for broad spectrum respirator applications

The investigation of copper-based impregnated activated carbons prepared from water-soluble materials for broad spectrum respirator applications

Ammonia, cyclohexane, nitrogen and water adsorption capacities of an activated carbon impregnated with increasing amounts of ZnCl2, and designed to chemisorb gaseous NH3 from an air stream

Mechanism of selenium sorption by activated carbon

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