Optimal Faujasite structures for post combustion CO 2 capture and separation in different swing adsorption processes

Prats, Hèctor; Bahamón, Daniel; Alonso, Gerard; Giménez, Xavier; Gamallo, Pablo; Sayós, R.

doi:10.1016/j.jcou.2017.03.007

Cited by 39 publications

(42 citation statements)

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“…2,3 On the other hand, solid adsorbent based technologies were found to be one of the effective methods for CO 2 capture as they have the potential to overcome the drawbacks encountered by the amine based absorption process owing to their high CO 2 uptakes, lower energy consumption and non-toxic nature. The adsorbents including zeolites, 4 amine modied materials, 5 metal-organic frameworks, 6 porous polymers, 7 carbon nanotubes, 8 silicon carbide, 9 mesoporous carbon nitrides, 10 etc. have been widely used for the capture of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

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Section: Introductionmentioning

confidence: 99%

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

et al. 2017

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“…However,acomprehensive explanation for the condensation of soluble aluminosilicates peciest o solid product remains elusive.F uture work such as in situ characterization techniques are implementing to obtain ad eeper understanding of reactionm echanisms both kinetically and thermodynamically.Asummary of SiO 2 /Al 2 O 3 molar ratios for zeoliteF AU samples synthesized by the four different approachesm entioned above is shown in Figure S15. [42] More straightforward reflection of the influence of SiO 2 /Al 2 O 3 molar ratio than the adsorption amount is the shape of the isotherms (Figure 3a). It is obvious that the SiO 2 /Al 2 O 3 molar ratio of zeolite FAUs ynthesized in this work (organic-free synthesis) is among the highest values that synthesized by other conventional organic-free methods, and larger than that synthesized using common OSDA.…”

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Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO₂/Al₂O₃ Molar Ratio

Guo

Sun

et al. 2018

Chemistry An Asian Journal

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Zeolite FAU with tunable SiO /Al O molar ratio has been successfully synthesized in the absence of organic structure-directing agents (OSDA). Specifically, the addition of zinc species contributes to the feasible and effective adjustment of the framework SiO /Al O molar ratio between about 4 and 6 depending on the amount of zinc species added in the batch composition. In contrast, a typical OSDA such as tetramethylammonium hydroxide (TMAOH) has a limited effect on the SiO /Al O molar ratio of the zeolite. The role of zinc species is essential for the crystallization of zeolite FAU with a higher SiO /Al O molar ratio under the particular synthesis conditions. It is speculated that zinc species may suppress the incorporation of aluminum into the aluminosilicate framework, which is due to the Coulombic repulsive interaction. A higher SiO /Al O molar ratio is also found to be accompanied by a lower CO adsorption heat for CO /CH separation.

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“…Grand-canonical Monte Carlo (GCMC) simulations allow the prediction of adsorption isotherms, adsorption selectivities and preferred adsorption sites at a very moderate computational expense, making an important contribution to the microscopic understanding of gas adsorption and separation in porous materials [37]. In a previous work [38], we have employed GCMC simulations to study the separation of postcombustion CO2/N2/O2 mixtures via PSA and VSA processes in FAU-type zeolites with different Si/Al ratio. An analysis of the influence of the Si/Al ratio on the CO2 capture performance revealed that faujasites having intermediate Al content are the most effective for P/VSA processes.…”

Section: Computational Methods Have Been Employed In a Complementary mentioning

confidence: 99%

Computational simulation study of the influence of faujasite Si/Al ratio on CO2 capture by temperature swing adsorption

Prats

Bahamón

Giménez

et al. 2017

Journal of CO2 Utilization

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Grand Canonical Monte-Carlo simulations are used to assess ten faujasite structures, the wellknown family of zeolites with different Al content in post-combustion CO2 capture via Temperature Swing Adsorption (TSA) processes, at 313-473 K and 100 kPa. Selectivity, working capacity, regenerability, purity, isosteric heat and working capacity values, for each structure, have been calculated from simulations, providing a rather complete evaluation of adsorbents' performance. Additionally, for all the structures the temperature dependence of the heat capacity has been modeled to estimate the thermal regeneration energy. Calculated heat capacities range from 0.78-0.86 kJ/kg•K at 313K to 0.98-1.15 kJ/kg•K at 473K, values considerably lower than those corresponding to aqueous amine solutions. Comparison of TSA results with previous Vacuum and Pressure Swing Adsorption (VSA and PSA) ones shows that there is no structure that works well for all three processes. Instead, each process reaches optimum conditions for certain range of Al content. Results indicate that high Al content faujasites, 64-to-96-FAU, are the most effective for TSA with working capacities above 1.7 mol/kg, doubling PSA/VSA values. Intermediate Al content 48-,64-FAU perform better at VSA conditions and low Al content 12-,24-FAU structures are more suitable for PSA processes. At moderate operative conditions (i.e., regeneration temperature of 413 K), TSA shows the highest purities (above 99% for one-stage process), followed by VSA and PSA. Finally, TSA is more effective in cleaning faujasites with 48 or more Al, compared to PSA/VSA, leading to a higher regenerability (energetic cost index range between 2.3-2.4 GJ/tCO2).

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Optimal Faujasite structures for post combustion CO 2 capture and separation in different swing adsorption processes

Cited by 39 publications

References 78 publications

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO₂/Al₂O₃ Molar Ratio

Computational simulation study of the influence of faujasite Si/Al ratio on CO2 capture by temperature swing adsorption

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Optimal Faujasite structures for post combustion CO 2 capture and separation in different swing adsorption processes

Cited by 39 publications

References 78 publications

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO2 capture at high pressure

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO2 capture at high pressure

Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO2/Al2O3 Molar Ratio

Computational simulation study of the influence of faujasite Si/Al ratio on CO2 capture by temperature swing adsorption

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Product

Resources

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Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO₂ capture at high pressure

Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO₂/Al₂O₃ Molar Ratio