Microporosity and adsorption characteristics against NO, SO2, and NH3 of pitch-based activated carbon fibers

Kaneko, Katsumi; Nakahigashi, Yoshitaka; Nagata, Kazuhiko

doi:10.1016/0008-6223(88)90223-0

Cited by 62 publications

(37 citation statements)

References 16 publications

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“…In contrast, Rubio and Izquerido (2013) reported that the surface area and the carbon content were the main factors that influenced the removal efficiency of the activated carbon obtained from carbon-enriched coal fly ashes. Kaneko et al (1988) claimed that the absorbability of activated carbon fibres in relation to NO, ammonia and sulfur dioxide at low temperature increased with specific surface area. Mochida et al (1994) reported that the main factor determining NO reduction activity was the nitrogen content of the samples.…”

Section: Introductionmentioning

confidence: 99%

Waste-derived activated carbons for control of nitrogen oxides

Al-Rahbi

Nahil

Wu³

et al. 2016

Proceedings of the Institution of Civil Engineers - Waste and R

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Activated carbons were produced from waste and investigated for their efficiency for the removal of mono-nitrogen oxides (NO x ) in simulated flue gases at a low temperature. The wastes used were waste biomass (date seeds), processed municipal solid waste in the form of refuse-derived fuel and waste tyres. The morphology, porous texture and surface chemistry of the prepared activated carbons were evaluated by scanning electron microscopy, energydispersive X-ray spectrometry, nitrogen adsorption and Boehm titration, and were compared with several commercial activated carbons. The carbons were then investigated in terms of their use in adsorbing NO x at a low temperature.The waste-derived activated carbons had NO x adsorption efficiencies at 50°C which were between 50 and 70% of those achieved for the commercial activated carbons. Increasing the adsorption temperature from 25 to 100°C significantly reduced nitrogen oxide (NO) adsorption. It was also shown that the NO adsorption efficiency depends on the porous structure, particularly the presence of micropores in the activated carbon, but to a lesser extent on the surface area of the carbons and acid-base surface groups on the carbon surface.

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Section: Introductionmentioning

confidence: 99%

Waste-derived activated carbons for control of nitrogen oxides

Al-Rahbi

Nahil

Wu³

et al. 2016

Proceedings of the Institution of Civil Engineers - Waste and R

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“…Their nitrogen adsorption isotherms at 77 K were measured by a volumetric method (Autosorb-1-MP Quantachrome). Each ACF sample was pretreated at 383 K and 1 mPa for 2 h. The micropore structural parameters were evaluated from the nitrogen adsorption isotherms at 77 K via the SPE method using a high-resolution α S -plot analysis (Kaneko and Ishii 1992). The micropore-size distribution was obtained from the Horvath-Kawazoe method.…”

Section: Methodsmentioning

confidence: 99%

“…Activated carbon fibres (ACFs) have been widely used in various technologies such as air purification (Kaneko and Imai 1998;Mochida et al 2000), water treatment (Oya et al 1996) and gas separation (Villar-Rodil et al 2002) because of their high surface areas and considerable micropore capacities Kaneko et al , 1988Rouquerol et al 1999). Recently, mesoporosity was introduced into an ACF (Miyamoto et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon Fibres of Different Cross-Sectional Morphologies

Miyamoto

Kanoh

Matsumoto³

et al. 2004

Adsorption Science & Technology

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Three kinds of activated carbon fibre (ACF) having different shapes were observed by scanning electron microscopy. Their cross-sectional morphologies were Y-shaped, asterisk-shaped and circular. The micropore structures of these ACF samples were determined by α S -plots from the nitrogen adsorption isotherms at 77 K. Analysis of the α S -plots showed that despite these ACFs having a non-circular cross-section, they retained their uniform microporosity similar to that of a conventional ACF with a circular cross-section.

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“…This was probably due to the fact that the adsorption isotherms are of type I or II, as observed for most organic and inorganic vapours. However, a finer analysis by Kaneko et al [2] indicated that, with respect to benzene, ammonia displays deviations from the classical Dubinin-Radushkevich plot. This behaviour is also revealed by the analysis of the work of Tamon and Okazaki [5] and the recent data of Helminen et al [9].…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption of ammonia vapours by activated carbons has been studied by different authors, using either adsorption [1][2][3][4][5][6][7][8][9][10] or calorimetric techniques [11,12]. However, this adsorptive has not received as much attention as, for example, organic vapours and water.…”

Section: Introductionmentioning

confidence: 99%

Specific and non-specific interactions between ammonia and activated carbons

Stoeckli

Guillot

Slasli

2004

Carbon

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It is shown that the adsorption of NH 3 by activated carbons at different temperatures follows Dubinin's theory and, as in the case of water, for carbons with high oxygen contents one observes an upward deviation in the initial section of the DR plot. This indicates a strong primary adsorption, due to specific interactions. At higher relative pressures, this adsorption is followed by a classical micropore filling mechanism, where NH 3 conforms to the pattern of non-specific adsorption. The affinity coefficient b 1 (NH 3 ) associated with primary adsorption varies between 0.4 and 1.2. It depends on the characteristic energy E 0 and on the ratio between the amount of oxygen present on the surface and the limiting amount of ammonia adsorbed in the micropores. This behaviour had been reported earlier for the adsorption of short alcohols, but with a single DR plot, due to the fact that specific and non-specific interactions were similar. For carbons with little oxygen on the surface, NH 3 adsorption leads to a single DR plot, irrespective of the average pore-size.

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Microporosity and adsorption characteristics against NO, SO2, and NH3 of pitch-based activated carbon fibers

Cited by 62 publications

References 16 publications

Waste-derived activated carbons for control of nitrogen oxides

Waste-derived activated carbons for control of nitrogen oxides

Activated Carbon Fibres of Different Cross-Sectional Morphologies

Specific and non-specific interactions between ammonia and activated carbons

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