Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability

Shen, Xuehua; Yan, Feng; Li, Chunyan; Qu, Fan; Wang, Pengju; Zhao, Shiyin; Zhang, Zuotai

doi:10.1016/j.jclepro.2021.130078

Cited by 22 publications

(4 citation statements)

References 66 publications

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“…It is noted, that the modified Arrhenius equation can help ensure numerical stability by reducing correlation between the pre-exponential factor and the activation energy and can thus result in more accurate predictions compared to the linear form of the equation . The value for the activation energy was calculated at E a = 8.5 kJ/mol, which is a reasonable one and in agreement with similar adsorption systems in the literature. , …”

Section: Resultssupporting

confidence: 79%

“…The very good agreement that is reflected between the Avrami model and the experimental results is most likely attributable to the model’s ability to take into account complex adsorption pathways. It is worth mentioning, that the Avrami model has successfully been used to describe kinetic adsorption processes for a multitude of adsorbate–adsorbent combinations. ,− …”

Section: Resultsmentioning

confidence: 99%

“…52 The value for the activation energy was calculated at E a = 8.5 kJ/mol, which is a reasonable one and in agreement with similar adsorption systems in the literature. 71,73 3.4. Effect of CO 2 Feed Partial Pressure and Isotherm Fitting.…”

Section: Effect Of Adsorbent Load 321 Breakthrough Evaluation Of the ...mentioning

confidence: 99%

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Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Tsiotsias,

Georgiadis,

Charisiou

et al. 2024

ACS Omega

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CO 2 adsorbents comprising various alkaline sorption active phases supported on mesoporous Al 2 O 3 were prepared. The materials were tested regarding their CO 2 adsorption behavior in the mid-temperature range, i.e., around 300 °C, as well as characterized via XRD, N 2 physisorption, CO 2 -TPD and TEM. It was found that the Na 2 O sorption active phase supported on Al 2 O 3 (originated following NaNO 3 impregnation) led to the highest CO 2 adsorption capacity due to the presence of CO 2 -philic interfacial Al−O − −Na + sites, and the optimum active phase load was shown to be 12 wt % (0.22 Na/Al molar ratio). Additional adsorbents were prepared by dispersing Na 2 O over different metal oxide supports (ZrO 2 , TiO 2 , CeO 2 and SiO 2 ), showing an inferior performance than that of Na 2 O/Al 2 O 3 . The kinetics and thermodynamics of CO 2 adsorption were also investigated at various temperatures, showing that CO 2 adsorption over the best-performing Na 2 O/Al 2 O 3 material is exothermic and follows the Avrami model, while tests under varying CO 2 partial pressures revealed that the Langmuir isotherm best fits the adsorption data. Lastly, Na 2 O/Al 2 O 3 was tested under multiple CO 2 adsorption−desorption cycles at 300 and 500 °C, respectively. The material was found to maintain its CO 2 adsorption capacity with no detrimental effects on its nanostructure, porosity and surface basic sites, thereby rendering it suitable as a reversible CO 2 chemisorbent or as a support for the preparation of dual-function materials.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

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Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Tsiotsias,

Georgiadis,

Charisiou

et al. 2024

ACS Omega

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“…However, excessively high desorption temperatures can also lead to the formation of urea, causing the deactivation of the adsorption sites. Therefore, choosing an appropriate desorption temperature is of great significance for the application of adsorbents …”

Section: Resultsmentioning

confidence: 99%

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Li,

Fu,

Pan

2023

Energy Fuels

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In recent years, the use of polyethylenimine (PEI)-functionalized adsorbents for CO 2 capture from flue gas has gained significant attention due to its excellent adsorption capacity. However, the influences of suitable support materials and their morphology on the adsorption and desorption of CO 2 have not been adequately explored. In this study, we investigate the impact of three nanostructures of SiO 2 support, namely, silica nanospheres (SNPs), silica nanosheets (SNHs), and silica nanotubes (SNTs), on CO 2 capture from ultralow emission flue gas, with special emphasis on key parameters such as the adsorption capacity, amine efficiency, kinetics, thermodynamics, cyclic stability, and optimal adsorption temperature to elucidate the crucial role of morphology. Experimental results demonstrated that SNHs facilitate the dispersion of PEI on their surface, thereby effectively utilizing the specific surface area and enhancing the dispersion of the active sites of PEI. This amine dispersion method successfully reduces the mass transfer resistance of CO 2 during the adsorption process. Conversely, SNTs lead to PEI dispersion between support particles, resulting in increased diffusion resistance toward CO 2 and consequently decreased adsorbent performance. For SNPs, the loading of PEI into the pores effectively prevented the degradation of the adsorption performance caused by PEI leaching during the cyclic use of the adsorbent. In addition, the larger pore volume of SNPs facilitated the loading of a greater number of PEI molecules. Notably, at 60 wt % PEI loading, SNPs exhibited a higher adsorption capacity (3.68 mmol/g), lower adsorption heat (51.91 kJ/mol), and reduced regeneration energy consumption (1.775 GJ/ton). This study sheds light on the role of the support morphology in adsorption processes and presents a novel strategy for designing solid amine adsorbents with favorable cycle stability, high CO 2 capture performance, and efficient amine utilization.

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Preparation of Mg(OH)2 Microsphere by Gas-Continuous Impinging Streams for Congo Red Absorption Removal

Tang,

Wang,

Zhu

et al. 2023

Water Air Soil Pollut

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Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability

Cited by 22 publications

References 66 publications

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Preparation of Mg(OH)2 Microsphere by Gas-Continuous Impinging Streams for Congo Red Absorption Removal

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Amine-functionalized nano-Al2O3 adsorbent for CO2 separation from biogas: Efficient CO2 uptake and high anti-urea stability

Cited by 22 publications

References 66 publications

Mid-temperature CO2 Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al2O3

Mid-temperature CO2 Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al2O3

Adsorption of CO2 in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

Preparation of Mg(OH)2 Microsphere by Gas-Continuous Impinging Streams for Congo Red Absorption Removal

Contact Info

Product

Resources

About

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Adsorption of CO₂ in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines