Highly efficient and stable PEI@Al2O3 adsorbents derived from coal fly ash for biogas upgrading

Li, Chunyan; Yan, Feng; Shen, Xuehua; Qu, Fan; Wang, Ying-Qing; Zhang, Zuotai

doi:10.1016/j.cej.2020.128117

Cited by 34 publications

(13 citation statements)

References 61 publications

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“…32 The band at 1311 cm −1 belonged to the carbamate (NCOO − ) skeletal vibration, which is caused by amine groups adsorbing CO 2 from air. 33 These results conrmed the successful loading of PEI on all the support materials. And Fig.…”

Section: Resultsmentioning

confidence: 80%

Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Shen,

Yan,

Zeng

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 80%

Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Shen,

Yan,

Zeng

et al. 2024

J. Mater. Chem. A

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“…In addition, the corresponding pore volume losses, subtracted from the related pore volumes of the pristine supports within various ranges, as a function of PEI loading, were further investigated by the linear fitting. A similar method had been adopted in other studies to identify the relationship between PEI loadings and pore volumes. , As evidenced in Figure S2, the overall good fitting results were observed in the larger pore size ranges with a higher correlation coefficient ( R 2 ). Especially in HP20, which possessed a full range of pore size, the fitting coefficients of PEI/HP20 under 10–50 nm, 50–100 nm, and >100 nm reached 0.997, 0.993, and 0.983, respectively, suggesting that the larger mesopore and macropore exhibited better accessibility of PEI functionalization.…”

Section: Results and Discussionmentioning

confidence: 83%

Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO₂ Adsorbents

Meng

et al. 2021

ACS Appl. Mater. Interfaces

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The emerging polyethylenimine (PEI)-functionalized solid adsorbents have witnessed significant development in the implementation of CO2 capture and separation because of their decent adsorption capacity, recyclability, and scalability. As an indispensable substrate, the importance of selecting porous solid supports in PEI functionalization for CO2 adsorption was commonly overlooked in many previous investigations, which instead emphasized screening amine types or developing complex porous materials. To this end, we scrutinized the critical role of different commercial porous supports (silica, alumina, activated carbon, and polymeric resins) in PEI impregnation in this study, taking into account multiple perspectives. Hereinto, the present results identified that abundant larger pore structures and surface functional groups were conducive to loading a considerable amount of PEI molecules. Various supports after PEI functionalization had great differences in adsorption capacities, amine efficiencies, and the corresponding optimal temperatures. In addition, more attention was paid to the role of porous supports in long-term stability during the consecutive adsorption–regeneration cycles, while N2 and CO2 purging as regeneration strategies, respectively. Especially, CO2-induced degradation due to urea species formation was specifically recognized in a SiO2-based adsorbent, which would induce serious concerns in CO2 cyclic capture. On the other side, we also confirmed that adopting conventional porous supports, for example, HP20, could achieve superior adsorption performance (above 4 mmol CO2/g) and cyclic stability (around 1% loss after 30 cycles) rather than the ones synthesized through complex approaches, which ensured the availability and scalability of PEI-functionalized CO2 adsorbents.

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“…12B). After 20 CO 2 adsorption cycles, there was a weak peak of urea linkages that emerged at 1,616 cm −1 , which indicated that amines had reacted with CO 2 53,54 . It might be the reason for the slight loss of adsorption capacity after 20 cycles.…”

Section: Resultsmentioning

confidence: 97%

“…After 20 CO 2 adsorption cycles, there was a weak peak of urea linkages that emerged at 1,616 cm −1 , which indicated that amines had reacted with CO 2 . 53,54 It might be the reason for the slight loss of adsorption capacity after 20 cycles. However, the peak at 3000-3350 cm −1 of the amino group had no obvious change after adsorption cycles, which could be attributed to the physical adsorption in the adsorption process.…”

Section: The Cyclic Stability Of the Amine-functionalized Porous Mate...mentioning

confidence: 99%

Physicochemical synergistic adsorption of CO₂ by PEI‐impregnated hierarchical porous polymers

Li,

Luo,

Zou

et al. 2024

Greenhouse Gases

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Amine‐functionalized porous polymers have been considered as a prominent chemical adsorption material for carbon capture and storage (CCS) process, because of their large adsorption capacity and high selectivity. By comparison, the low energy‐consumption for desorption and high recyclability are the advantages of the physical adsorption approach. In this work, an amine‐functionalized hierarchical porous polymer was prepared by HIPE (high internal phase emulsions) template and amine impregnation strategy, and applied as CO2 adsorbent to realize chemical adsorption and physical adsorption simultaneously. First, a hierarchical porous matrix of poly(styrene‐glycidyl methacrylate) was prepared by the HIPE method. The formed meso/micropores in the typical porous polymer matrix could attract CO2 molecules, where the physical adsorption was achieved. Subsequently, PEI (polyethyleneimine) was impregnated into the porous polymer with abundant macropores, and the numerous of amino groups provided the reaction sites, where the chemical adsorption was achieved. As a result, an effective CO2 adsorption material was obtained via controlling the porous structure by changing the volume fraction of dispersive phase, impregnation condition and amine loading. Aided by the chemical adsorption of amino groups, the CO2 adsorption capacity of the obtained adsorbent reached 3.029 mmol/g. Moreover, the CO2 adsorption thermodynamics confirmed the physicochemical synergistic adsorption, and then the Qst reduced to 31–42 kJ/mol and a good cyclic stability was obtained. As conclusion, the porous adsorbent showed a good industrial application prospect. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Highly efficient and stable PEI@Al2O3 adsorbents derived from coal fly ash for biogas upgrading

Cited by 34 publications

References 61 publications

Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO₂ Adsorbents

Physicochemical synergistic adsorption of CO₂ by PEI‐impregnated hierarchical porous polymers

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Highly efficient and stable PEI@Al2O3 adsorbents derived from coal fly ash for biogas upgrading

Cited by 34 publications

References 61 publications

Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

Efficient and stable CO2 capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al2O3 adsorbent

Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO2 Adsorbents

Physicochemical synergistic adsorption of CO2 by PEI‐impregnated hierarchical porous polymers

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Resources

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Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Efficient and stable CO₂ capture using a scalable and spontaneous cross-linking amine-functionalized nano-Al₂O₃ adsorbent

Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO₂ Adsorbents

Physicochemical synergistic adsorption of CO₂ by PEI‐impregnated hierarchical porous polymers