Adsorption equilibrium and breakthrough analysis for NO adsorption on activated carbons at low temperatures

Claudino, Andréia; Soares, José Luciano; Moreira, Regina de Fátima Peralta Muniz; José, Humberto Jorge

doi:10.1016/j.carbon.2004.01.048

Cited by 47 publications

(17 citation statements)

References 17 publications

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“…where n adsi is the dynamic adsorption capacity of any gas i, F is the total molar flow, C 0i is the concentration of the gas i entering the column, W is the mass of adsorbent loaded in the column, and t ni is the stoichiometric time corresponding to gas i, which is estimated from the breakthrough profile according to (2) (Claudino et al 2004): where C 0i and C Ai are the concentrations of any gas i upstream and downstream the column, respectively.…”

Section: Adsorption In Humid Streamsmentioning

confidence: 99%

Triamine-grafted pore-expanded mesoporous silica for CO2 capture: Effect of moisture and adsorbent regeneration strategies

2010

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Adsorption of carbon dioxide (CO 2 ) was investigated on triamine-grafted, pore-expanded MCM-41 mesoporous silica (TRI-PE-MCM-41). Measurements of adsorption capacity using mass spectrometry showed an enhanced CO 2 adsorption capacity in humid streams compared to dry CO 2 . This was corroborated with breakthrough experiments, which also showed that TRI-PE-MCM-41 offered a practically infinite selectivity towards CO 2 over nitrogen. Cyclic measurements of pure CO 2 and CO 2 :N 2 = 10:90 mixture using different regeneration modes showed that aminegrafted PE-MCM-41 is particularly suitable for CO 2 removal using temperature swing adsorption (TSA) at adsorption temperatures higher than ambient, while temperaturevacuum swing adsorption (TVSA) may be attractive at ambient temperature.

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Section: Adsorption In Humid Streamsmentioning

confidence: 99%

Triamine-grafted pore-expanded mesoporous silica for CO2 capture: Effect of moisture and adsorbent regeneration strategies

2010

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“…The temperature of carbon was monitored with a thermocouple. The adsorption tests were conducted with a fixed activated carbon mass of 2·8 g, which was previously treated under nitrogen at 500°C for 30 min in order to clean the surface oxides and desorb the adsorbed gases on the carbon surface (Claudino et al, 2004;Lopez et al, 2007). The bed depth was about 3 cm which gave $1·7 s gas residence time through the carbon bed.…”

Section: No X Adsorption Reactor Systemmentioning

confidence: 99%

“…The kinetics of NO x removal by carbon of commercial origin has been studied by many researchers (Claudino et al, 2004;Klose and Rincón, 2007;Mochida et al, 1994;Shirahama et al, 2002;Teng and Suuberg, 1993;Zhang et al, 2008) and it has been concluded that the origin, the natural impurities in the feedstock, surface chemistry and the conditions used to prepare activated carbon are the main factors that can control its efficiency for NO x reduction (Xu et al, 2003). Although there has been much research into NO x control using activated carbons, the factors controlling the NO x adsorption process are still not clear.…”

Section: Introductionmentioning

confidence: 99%

Waste-derived activated carbons for control of nitrogen oxides

Al-Rahbi¹,

Williams²,

Wu³

et al. 2015

Proceedings of the ICE - Waste and Resource Management

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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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“…Another innovative method, proposed by Guo et al [108], for Hg [27,109,110], but also nitrogen oxide [111], sulfur dioxide [112,113] and/or hydrochloric acid [112], carbon-based materials promote elemental mercury oxidation. However, the aspects of carbon based materials used for Hg el oxidation will not be covered in the present review.…”

Section: Novel Catalytic Methods For Mercury Oxidation In Flue Gasesmentioning

confidence: 99%

Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

2012

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Abstract:The removal of mercury from flue gases in scrubbers is greatly facilitated if the mercury is present as water-soluble oxidized species. Therefore, increased mercury oxidation upstream of scrubber devices will improve overall mercury removal. For this purpose heterogeneous catalysts have recently attracted a great deal of interest. Selective catalytic reduction (SCR), noble metal and transition metal oxide based catalysts have been investigated at both the laboratory and plant scale with this objective. A review article published in 2006 covers the progress in the elemental mercury (Hg el ) catalytic oxidation area. This paper brings the review in this area up to date. To this end, 110 papers including several reports and patents are reviewed. For each type of catalyst the possible mechanisms as well as the effect of flue gas components on activity and stability are examined. Advantages and main problems are analyzed. The possible future directions of catalyst development in this environmental research area are outlined.

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Adsorption equilibrium and breakthrough analysis for NO adsorption on activated carbons at low temperatures

Cited by 47 publications

References 17 publications

Triamine-grafted pore-expanded mesoporous silica for CO2 capture: Effect of moisture and adsorbent regeneration strategies

Triamine-grafted pore-expanded mesoporous silica for CO2 capture: Effect of moisture and adsorbent regeneration strategies

Waste-derived activated carbons for control of nitrogen oxides

Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

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