In Situ Infrared Study of the Role of PEG in Stabilizing Silica‐Supported Amines for CO<sub>2</sub> Capture

Tanthana, Jak; Chuang, Steven S. C.

doi:10.1002/cssc.201000090

Cited by 108 publications

(129 citation statements)

References 37 publications

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“…We found that adsorption half time, which is defined as the time required for the sorbents to reach half of their saturated adsorption capacities, can serve as a semiquantitative indicator of the overall adsorption and diffusion kinetics. 55,56 Analysis of the CO 2 profiles for amine sorbents in the literature 52,54,55,57 revealed that the sorbents' adsorption half times were within the range of those of our TEPA films, between 0.28 and 0.42 min. 52,54,55,57 Comparable adsorption half times for the sorbents and films suggests similar adsorption kinetics for immobilized and liquid amines, in spite of potential diffusion effects in the immobilized amine sorbent.…”

Section: ■ Introductionmentioning

confidence: 83%

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films

Wilfong

Srikanth

Chuang

2014

ACS Appl. Mater. Interfaces

176

196

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CO2 adsorption/desorption onto/from tetraethylenepentamine (TEPA) films of 4, 10, and 20 μm thicknesses were studied by in situ attenuated total reflectance (ATR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) techniques under transient conditions. Molar absorption coefficients for adsorbed CO2 were used to determine the CO2 capture capacities and amine efficiencies (CO2/N) of the films in the DRIFTS system. Adsorption of CO2 onto surface and bulk NH2 groups of the 4 μm film produced weakly adsorbed CO2, which can be desorbed at 50 °C by reducing the CO2 partial pressure. These weakly adsorbed CO2 exhibit low ammonium ion intensities and could be in the form of ammonium-carbamate ion pairs and zwitterions. Increasing the film thickness enhanced the surface amine-amine interactions, resulting in strongly adsorbed ion pairs and zwitterions associated with NH and NH2 groups of neighboring amines. These adsorbed species may form an interconnected surface network, which slowed CO2 gas diffusion into and diminished access of the bulk amine groups (or amine efficiency) of the 20 μm film by a minimum of 65%. Desorption of strongly adsorbed CO2 comprising the surface network could occur via dissociation of NH3(+)/NH2(+)···NH2/NH ionic hydrogen bonds beginning from 60 to 80 °C, followed by decomposition of NHCOO(-)/NCOO(-) at 100 °C. These results suggest that faster CO2 diffusion and adsorption/desorption kinetics could be achieved by thinner layers of liquid or immobilized amines.

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Section: ■ Introductionmentioning

confidence: 83%

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films

Wilfong

Srikanth

Chuang

2014

ACS Appl. Mater. Interfaces

176

196

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“…Alongside amine leaching it is possible that the active sites are deactivating through the formation of carboxylate/carbamate/urea species. This effect was investigated by Tanthana et al [22] through an infra-red spectroscopy study. The rate of amine leaching was lower at lower loadings.…”

Section: Ranking Of Impregnated Materials As Candidates For Co 2 Adsomentioning

confidence: 96%

The effect of pore structure on the CO2 adsorption efficiency of polyamine impregnated porous carbons

Gibson

Gromov

Brandani

et al. 2015

Microporous and Mesoporous Materials

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a b s t r a c tThe effect of polyamine impregnation on the CO 2 adsorption properties of two different porous carbons, one microporous and one mesoporous, was studied systematically. The pore filling during impregnation with polyamines was shown to result in a fraction of the unfilled micropore volume being blocked for gas adsorption. Thermal gravimetric analysis was used to compare the CO 2 capacity at 0.1 bar with respect to the carbon support type, the amount of amine loading, and the type of amine. A 12 fold increase in the CO 2 capacity was observed when the impregnated activated carbon was compared to the raw starting material. A heat of adsorption for amine impregnated support of~90 kJ mol À1 was found, clearly indicating a chemisorption mechanism. The mesoporous material provided a more efficient support for the amine to interact with the CO 2 . The interaction between low molecular weight amines and CO 2 showed a more efficient utilization of the basic groups in comparison to high molecular weight species.

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“…Besides, the addition of PEG also increased the fraction of weakly adsorbed CO 2 species (Zwitterion as shown in Eq. (1)), which was related to a hydrogen-bonding species (i.e., NH 2 -O) (Tanthana and Chuang, 2010). Plaza et al (2007Plaza et al ( , 2008) studied CO 2 capture using activated carbon and alumina impregnated with various types of amines including primary and secondary alkylamines such as DETA, pentaethylenehexamine (PEHA) and PEI, alkanolamines such as diisopropanolamine (DIPA), sterically hindered 2-amino-2-methyl-1,3-propanediol (AMPD), and triethanolamine (TEA).…”

Section: Fig 3 (Continued)mentioning

confidence: 99%

A Review of CO2 Capture by Absorption and Adsorption

Huang

Tan

2012

Aerosol Air Qual. Res.

1,461

875

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Global warming resulting from the emission of greenhouse gases, especially CO 2 , has become a widespread concern in the recent years. Though various CO 2 capture technologies have been proposed, chemical absorption and adsorption are currently believed to be the most suitable ones for post-combustion power plants. The operation of the chemical absorption process is reviewed in this work, together with the use of absorbents, such as the ionic liquid, alkanolamines and their blended aqueous solutions. The major concerns for this technology, including CO 2 capture efficiency, absorption rate, energy required in regeneration, and volume of absorber, are addressed. For adsorption, in addition to physical adsorbents, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed in this work. The major concerns for selection of adsorbent, including cost, adsorption rate, CO 2 adsorption capacity, and thermal stability, are compared and discussed. More effective and less energy-consuming regeneration techniques for CO 2 -loaded adsorbents are also proposed. Future works for both absorption and adsorption are suggested.

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In Situ Infrared Study of the Role of PEG in Stabilizing Silica‐Supported Amines for CO₂ Capture

Cited by 108 publications

References 37 publications

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films

The effect of pore structure on the CO2 adsorption efficiency of polyamine impregnated porous carbons

A Review of CO2 Capture by Absorption and Adsorption

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In Situ Infrared Study of the Role of PEG in Stabilizing Silica‐Supported Amines for CO2 Capture

Cited by 108 publications

References 37 publications

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO2 on Tetraethylenepentamine Films

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO2 on Tetraethylenepentamine Films

The effect of pore structure on the CO2 adsorption efficiency of polyamine impregnated porous carbons

A Review of CO2 Capture by Absorption and Adsorption

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In Situ Infrared Study of the Role of PEG in Stabilizing Silica‐Supported Amines for CO₂ Capture

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films

In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO₂ on Tetraethylenepentamine Films