Performance of fixed-bed KOH impregnated activated carbon adsorber for NO and NO2 removal in the presence of oxygen

Lee, Young Whan; Choi, Dae Ki; Park, Jin Won

doi:10.1016/s0008-6223(01)00312-8

Cited by 47 publications

(27 citation statements)

References 21 publications

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“…The NOX reduction capacity by coal char samples has been found to increase from 3% to 63% when the char was loaded with 4 wt.% potassium According to studies by Lee et al (2002) and Nowicki et al (2010), the high NO capture by carbons treated with KOH is due to the basic nature of hydroxides provided on the carbon surface. In the presence of oxygen, NO could oxidize to NO2 and then react with KOH, which provides selective adsorption sites for NOx, according to the following reactions (Lee at al., 2002):…”

Section: Nitrogen Oxide Adsorptionmentioning

confidence: 99%

Production of activated carbons from waste tyres for low temperature NOx control

Al-Rahbi

Williams

2016

Waste Management

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Waste tyres were pyrolysed in a bench scale reactor and the product chars were chemically activated with alkali chemical agents, KOH, K2CO3, NaOH and Na2CO3 to produce waste tyre derived activated carbons. The activated carbon products were then examined in terms of their ability to adsorb NOx (NO) at low temperature (25 °C) from a simulated industrial process flue gas. This study investigates the influence of surface area and porosity of the carbons produced with the different alkali chemical activating agents on NO capture from the simulated flue gas. The influence of varying the chemical activation conditions on the porous texture and corresponding NO removal from the flue gas was studied. The activated carbon sorbents were characterized in relation to BET surface area, micropore and mesopore volumes and chemical composition. The highest NO removal efficiency for the waste tyre derived activated carbons was ~75% which was obtained with the adsorbent treated with KOH which correlated with both the highest BET surface area and largest micropore volume.In contrast, the waste tyre derived activated carbons prepared using K2CO3, NaOH and Na2CO3 alkali activating agents showed much lower NO removal from the flue gases. The results suggest problematic waste tyres, have the potential to be converted to activated carbons with NOx removal efficiency comparable with conventionally produced carbons.

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Section: Nitrogen Oxide Adsorptionmentioning

confidence: 99%

Production of activated carbons from waste tyres for low temperature NOx control

Al-Rahbi

Williams

2016

Waste Management

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“…Rubel et al (1995) indicated that under certain conditions the overall adsorption capacities might be independent of the amount of AC used. In the existence of oxygen, NO might be catalytically oxidized to NO 2 on the carbon surface ; when in the poverty of oxygen ambient temperature, very little NO was adsorbed on porous adsorbents (Lee et al, 2002;Kaneko and Imai, 1989). reported that NO could be reversibly adsorbed on the carbon surface forming a complex.…”

Section: The Effect Of Microwave Power On the Destruction Efficiencymentioning

confidence: 99%

“…AC is usually prepared from the pyrolysis and the following activation, either by physical or chemical processes, of coal, wood byproducts, various types of cellulose materials and pitches (Ahmadpour and Do, 1996;Molina-Sabio et al, 1996). These AC, with large porous structure and high surface area, is broadly studied and used in many practical applications (Mochida et al, 2000;Shirahama et al, 2002;Lee et al, 2002). Nevertheless, the influence of the type of active carbon on NO x adsorption capacity has shown equivocal consequences.…”

Section: Introductionmentioning

confidence: 99%

Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Chang

Yan

Tseng

et al. 2012

Aerosol Air Qual. Res.

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Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technique are widely used to control nitrogen oxides emissions. However, both techniques have a general shortcoming known as NH 3 slip.This research introduced the design of activated carbon in a circulating fluidized-bed with microwave system and developed an innovative de-NO x technique. The whole system demonstrated the capability and advantage of reducing reductant cost and continuous process. The experiments investigated microwave to regenerate activated carbon (AC) in order to increase adsorption and destruction efficiency while reducing energy consumption. In the NO x abatement process, activated carbon adsorbed NO and NO 2 and then utilized microwave heating technology to regenerate itself because of microwave's high energy utilization and strong penetration ability. The specific surface areas of AC increased from 673.03 to 834.52 (m 2 /g) when microwave power was increased from 0 to 550 W, respectively, in this study. Through increasing the specific surface area, the microwave treatment further improved the NO x adsorption capacity and rate.In consequence, the results indicated that destruction efficiency of NO and NO 2 at 200 ppm could reach about 80% with microwave power of 350 W and above 85% of 550 W. The destruction efficiency at 550 W for NO x was about 77%.

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“…Thus, alkali metal hydroxides, particularly KOH, were found to enhance the selective adsorption of NO x via the formation of surface nitrates. [14] The impregnation of carbon materials with transition metals also increased NO x adsorption efficiency, mainly due to the catalytic properties of metals and their ability to reduce NO x in an oxidation-reduction cycle. [15][16] One type of carbonaceous materials that was found to be highly effective in a desulfurization process is a carbon derived from polystyrene-based salts.…”

Section: Introductionmentioning

confidence: 99%

Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

Bashkova

Bandosz

2011

ChemSusChem

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Adsorption of NO(2) and retention of NO (the product of NO(2) reduction by carbon) on iron-containing materials prepared from polystyrenesulfonic acid-co-maleic acid iron salt were studied. The surface of the materials was characterized using nitrogen adsorption, XRD, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and FTIR spectroscopy, and thermogravimetric analysis (TGA). The results showed the positive effects of the pore volume and well-dispersed iron species (Fe(2)O(3), FeSO(4), and FeS) on the performance of carbons as NO(2) adsorbents at room temperature. The retention of NO(2) on the carbon surface takes place either through its reduction to NO by carbon and/or by Fe(2)O(3), FeSO(4), and FeS, or through its reaction with Fe(2)O(3) and/or Fe(OH)(3), leading to the formation of Fe(NO(3))(3). The retention of NO is enhanced on carbons containing iron in the form of α-FeOOH, α-Fe(2)O(3), or γ-FeOOH. The best performance was found on the carbon with α-Fe(2)O(3). Dispersion and the particle size of iron compounds on the carbon surface affect both the adsorption/reduction process of NO(2) and the retention process of NO.

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Performance of fixed-bed KOH impregnated activated carbon adsorber for NO and NO2 removal in the presence of oxygen

Cited by 47 publications

References 21 publications

Production of activated carbons from waste tyres for low temperature NOx control

Production of activated carbons from waste tyres for low temperature NOx control

Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

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Performance of fixed-bed KOH impregnated activated carbon adsorber for NO and NO2 removal in the presence of oxygen

Cited by 47 publications

References 21 publications

Production of activated carbons from waste tyres for low temperature NOx control

Production of activated carbons from waste tyres for low temperature NOx control

Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Reactive Adsorption of NO2 at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons

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Reactive Adsorption of NO₂ at Ambient Conditions on Iron‐Containing Polymer‐Based Porous Carbons