Removal of nitrogen oxides from air by chemicals-impregnated carbons

Takéuchi, Yasushi; Yanagisawa, Kohjiro; Tanaka, Yuhsuke; Tsuruoka, Noriyuki

doi:10.1007/bf02707055

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…In contrast, Teng and Suuberg (1993) have suggested the reversible chemisorption of NO: NO + C « C(NO) (7) with the kinetics of the process being quite slow with time constants in hours. The formation of reversible complexes can be accompanied by the formation of carbon oxide surface complexes, limited by the availability of free active sites.…”

Section: Introductionmentioning

confidence: 99%

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Multicomponent Adsorption of Butane, NO₂ and SO₂ on Activated Carbon

Ahnert

Heschel

2002

Adsorption Science & Technology

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Dynamic adsorption experiments have been carried out with the help of an FT-IR (Fourier-Transform InfraRed) spectrometer. Fixed bed adsorption breakthrough curves were obtained for n-butane, SO 2 and NO 2 gases as well as for the reaction products NO, N 2 O and CO 2 . The adsorption of SO 2 and NO 2 on activated carbon was studied both during single-and co-adsorption experiments at 30ºC. The activated carbon used exhibited a disadvantage towards NO 2 adsorption in that it was partly converted to NO and immediately desorbed as NO. A further reaction to N 2 O could also be observed. The activated carbon was rapidly altered and lost a notable part of its loading capacity as a result of the presence of water and oxygen. During co-adsorption, SO 2 reacted with NO 2 (both as adsorbed species) and produced an additional amount of NO. An ash-tree spherical activated carbon with an extended surface area (1000 m 2 /g) was used in all experiments.

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Section: Introductionmentioning

confidence: 99%

“…Kong and Cha (1996) also reported that the adsorption capacity depends on the humidity, but that high relative humidity blocks the pores and disables the adsorption of NO 2 . However, NO 2 reacts with water adsorbed on the surface of the pores, to form nitric acid leading to an increase in the adsorption capacity (Takeuchi et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Multicomponent Adsorption of Butane, NO₂ and SO₂ on Activated Carbon

Ahnert

Heschel

2002

Adsorption Science & Technology

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“…It has been proved that NO can be chemisorbed on the surface of carbon at lower temperature and react with carbon at higher temperature. Reduction of NO with carbonaceous materials with or without catalyst loading has been proposed as a promising way to lower NO emissions from combustion systems [4][5][6][7][8][9][10][11][12][13]. Among various carbonaceous materials, e.g., coal char, activated carbon, graphite, phenol-formaldehyde resin (PFR) char and biomass char, PFR char is an excellent model material used for the studies on the reduction of NO because it has a similar structure as coal char but negligible inorganic matter content [4][5][6][7]10].…”

Section: Introductionmentioning

confidence: 99%

Effect of pyrolysis temperature on the char micro-structure and reactivity of NO reduction

Yin

Zhang

Sheng

2009

Korean J. Chem. Eng.

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A phenol-formaldehyde resin (PFR) and a bituminous coal (SH) were pyrolyzed at various temperatures. The structure and the char-NO reactivity were analyzed in order to examine the effect of pyrolysis temperature on the micro-structure of the resulting char and further on the reactivity towards NO. Micro-structure of the char samples was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy. It was indicated that the micro-structure of PFR char and coal char experienced remarkable changes during pyrolysis, which resulted in the decrease of phenolic OH, aromatic hydrogen and more ordered structure. The pyrolysis temperature showed a weak impact on the reactivity of PFR char but comparatively remarkable impact on that of coal char at lower reaction temperature. Mineral matter in coal char presented a weak effect on the reactivity.

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