Capturing CO2 from ambient air using a polyethyleneimine–silica adsorbent in fluidized beds

Zhang, Wenbin; Liu, Hao; Sun, Chenggong; Drage, Trevor C.; Snape, Colin E.

doi:10.1016/j.ces.2014.05.018

Cited by 148 publications

(101 citation statements)

References 35 publications

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“…5) for the just reported studies is comparable to the ∼ 200 kg/m 3 estimated difference between fresh-and worn-out-postadsorption SSA (based on the adsorption capacity of 142 mg of CO 2 per g of sorbent, reported by Wang et al 2014b, multiplied by the 1400 kg/m 3 SSA density of Zhang et al 2014a). Some degree of separation could already be possible, at least between freshest and oldest SSA particles; development of sorbents with higher adsorption capacity will increase density difference between fresh and spent sorbent, making separation sharper.…”

Section: Consequence Of Separation Errorssupporting

confidence: 51%

Selective strategy for solid sorbent replacement in CCS

Colantuono

Cockerill

2017

Chemical Engineering Research and Design

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Please cite this article as: Giuseppe Colantuono, Timothy Cockerill, Selective strategy for solid sorbent replacement in CCS, (2017), http://dx.doi.org/10. 1016/j.cherd.2017.01.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Page 1 of 21A c c e p t e d M a n u s c r i p tThe continuous replacement of solid sorbent in post-combustion CCS loops is modeled. The known method removes/replaces a constant amount of sorbent after each iteration. Known method discards fresher material, too, as the looping sorbent is fully mixed. We can sort removed CO2-loaded sorbent: the fresher is denser due to higher capacity. Our novel strategy puts freshest sorbent back; we compute the reduced need of sorbent. *Research HighlightsPage 2 of 21 AbstractAn innovative method for sorbent replacement in the looping of a generic solid sorbent for post-combustion carbon capture and sequestration (CCS) is introduced. First, the standard replacement method is revisited with some original results presented. A new strategy is then modeled, aimed at selectively replacing the material as it degrades. This method exploits the density difference, after adsorption, between relatively fresh, CO 2 -laden sorbent and relatively degraded material, with small residual adsorption capacity. The model is then applied to values of degradation rate within the experimental range available in scientific literature for silica-supported amines (SSA). The selective removal strategy ideally allows a saving of 37% of the sorbent with respect to the standard, undifferentiated replacement considered in first place, while keeping the same adsorptive capacity of the system.

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Section: Consequence Of Separation Errorssupporting

confidence: 51%

Selective strategy for solid sorbent replacement in CCS

Colantuono

Cockerill

2017

Chemical Engineering Research and Design

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“…[54] Other values between 60-71 kJ mol CO2 À1 werea lso reported over PEI/silica sorbents. The heat of sorption between CO 2 and amine groups for the PAA(50)/SBA-15a nd PEI-II(50)/SBA-15 sorbents was estimated by TGA differential scanningc alorimetry (DSC).I tw as about 77 kJ mol CO2 À1 for PEI-II(50)/SBA-15 sorbent, lower than the reportedv alue of 90 kJ mol CO2 À1 fort he PEIw ith M W of 1800 over mesoporouss ilica measured by using aS ENSYS Evo TG-DSC.…”

Section: Effect Of Sorption Temperaturementioning

confidence: 96%

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas

Wang

Song

2017

ChemPhysChem

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Polyallylamine (PAA)-based molecular basket sorbents (MBS) have been studied for CO capture in comparison with polyethylenimine (PEI)-based MBS. The characterizations including N physisorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermogravimetric analysis (TGA) showed that PAA (M =15 000) is more rigid and has more steric hindrance inside SBA-15 pores than PEI owing mainly to its different polymer structure. The effects of temperature and PAA loading on the CO sorption capacity of PAA-based MBS have been examined by TGA by using 100 % CO gas stream and compared with PEI/SBA-15. It was found that the capacity of the PAA/SBA-15 sorbent increased with increasing temperature. The optimum capacity of 88 mg g was obtained at 140 °C for PAA(50)/SBA-15 whereas the optimum sorption temperature was 75 and 90 °C for PEI-I(50)/SBA-15 (PEI-I, M =423) and PEI-II(50)/SBA-15 (PEI-II, M =25 000), respectively. The capacity initially increased with the increase of PAA loading and then dropped at high amine contents, owing to the increased diffusion barrier. The highest CO capacity of 109 mg g was obtained at a PAA loading of 65 wt %, whereas the PAA(50)/SBA-15 sorbent gave the best amine efficiency of 0.23 mol mol . The effect of moisture was examined in a fixed-bed flow system with simulated flue gas containing 15 % CO and 4.5 % O in N . It was found that the presence of moisture significantly enhanced CO sorption over PAA(50)/SBA-15 and greatly improved its cyclic stability and regenerability. Compared with PEI/SBA-15, PAA/SBA-15 possesses a better thermal stability and higher resistance to oxidative degradation. However, the CO sorption rate over the PAA(50)/SBA-15 sorbent was much slower.

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“…44 However, most reports state that the regeneration temperatures of ILs and amino-functionalized adsorbents are higher than 100 8C. [70][71][72] Zhang et al [73] reported a CO 2 desorption temperature of 130 8C in a fluidized bed for silica-supported polyethyleneimine. Liu et al [74] studied polyethyleneimine-functionalized titanate nanotubes to capture CO 2 , and the desorption temperature was 150 8C.…”

Section: And3mentioning

confidence: 98%

Development of Ionic Liquids Tethered to Coconut Shell Activated Carbon for Biogas Upgrading in a Packed Bed

et al. 2015

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Ionic liquids (ILs) were prepared in situ successfully on coconut shell activated carbon (AC) granules for biogas upgrading in a packed bed. In biogas upgrading, the saturated CO2 capture capacities of AC‐tethered 1‐butyl‐3‐propylimidazolium bis(trifluoromethylsulfonyl)imide (AC‐[BPIM][Tf2N]) and AC‐tethered 1‐aminoethyl‐3‐propylimidazolium bis(trifluoromethylsulfonyl)imide (AC‐[EPIM‐NH2][Tf2N]) were 2.58 and 2.95 mmol g−1 at 20 °C and 0.5 MPa, respectively. The heat of adsorption was 23–28 kJ mol−1 for AC‐[BPIM]‐based adsorbents and 65–71 kJ mol−1 for AC‐[EPIM‐NH2]‐based ones. As a CO2 concentration of less than 3 % is required for biogas to be used in a vehicle, an adsorption capacity at which 3 % of CO2 is reached in the upgraded gas could be more important. If the flow rate of the inlet gas was 50 mL min−1, the adsorption capacity at which 3 % of CO2 is reached in the upgraded gas was 1.44 mmol g−1 for AC‐[BPIM][Tf2N] and 1.95 mmol g−1 for AC‐[EPIM‐NH2][Tf2N] at 20 °C and 0.2 MPa. The adsorption selectivities of CO2 over CH4 were ∼92 and 95 % for AC‐[BPIM][Tf2N] and AC‐[EPIM‐NH2][Tf2N], respectively. The immobilized ILs exhibited a relatively stable cyclability in a packed bed.

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Capturing CO2 from ambient air using a polyethyleneimine–silica adsorbent in fluidized beds

Cited by 148 publications

References 35 publications

Selective strategy for solid sorbent replacement in CCS

Selective strategy for solid sorbent replacement in CCS

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas

Development of Ionic Liquids Tethered to Coconut Shell Activated Carbon for Biogas Upgrading in a Packed Bed

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Capturing CO2 from ambient air using a polyethyleneimine–silica adsorbent in fluidized beds

Cited by 148 publications

References 35 publications

Selective strategy for solid sorbent replacement in CCS

Selective strategy for solid sorbent replacement in CCS

Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO2 Capture from Flue Gas

Development of Ionic Liquids Tethered to Coconut Shell Activated Carbon for Biogas Upgrading in a Packed Bed

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Comparative Study of Molecular Basket Sorbents Consisting of Polyallylamine and Polyethylenimine Functionalized SBA‐15 for CO₂ Capture from Flue Gas