Adsorption Separation of CO2/CH4 from Landfill Gas by Ethanolamine-Modified Silica Gel

Zhang, Yong; Chen, Kejin; Lv, Chao; Wu, Taijun; Wen, Yonglin; He, Hua; Sheng, Yu Jane; Wang, Liao

doi:10.1007/s11270-021-05001-w

Cited by 13 publications

(4 citation statements)

References 27 publications

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“…The main functional groups of the activated carbon before and after the modification are similar. The strong peaks around 3445 cm À 1 with high intensity are attributed to OÀ stretching vibration in alcohols, phenols and carboxylic acids and in adsorbed water molecules [47,52,53]. Compared with R-AC, the peak of K-AC is stronger at this point.…”

Section: Characterization Of the Samplesmentioning

confidence: 95%

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Preparation and characterization of activated carbon modified by potassium for carbon dioxide/methane adsorption and separation

Xue

Gong

Zeng

et al. 2022

Materialwissenschaft Werkst

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In this study, potassium nitrate, which was confirmed feasible to improve the adsorption capacity of carbon dioxide and separation of carbon dioxide/methane mixture, was utilized to modify the commercial coconut shell activated carbon. Three parameters, including potassium ion concentration, modification temperature and modification time, were investigated. The best sample is obtained when impregnating in potassium nitrate solution of 0.1 mol L À 1 at 55 °C for 12 h according to its adsorbed amount capacity and separation effect. The saturated adsorbed amount of carbon dioxide on the optimal sample reaches up to 12.25 mmol g À 1 . In addition, the selectivity for a binary mixture with volume ratio of 60/40, 50/50 and 40/60, which is considered in the range of typical landfill gas, are 6.86, 6.62 and 6.39, increasing by 45.9 %, 43.6 % and 41.4 %, respectively. The adsorbent obtained in this study is promising in the adsorption and separation of carbon dioxide and methane industrially. Moreover, the method of modifying by potassium ion provides a potential way in improving the property of the adsorbents.

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Section: Characterization Of the Samplesmentioning

confidence: 95%

“…The peaks around 1384 cm À 1 are ascribed to CÀ O band stretching in carboxylic acid, phenol and ethanol [22,47]. The peaks at 1087 cm À 1 are caused by the asymmetric stretching vibration of CÀ OÀ C in ethers [52,56]. The bands around 700 cm À 1 are attributed to potassium [47].…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

Preparation and characterization of activated carbon modified by potassium for carbon dioxide/methane adsorption and separation

Xue

Gong

Zeng

et al. 2022

Materialwissenschaft Werkst

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show abstract

“…Currently, the main technologies have been explored for CO 2 /CH 4 separation, including cryogenic separation [ 13 , 14 ], membrane separation [ 15 , 16 , 17 ], water scrubbing [ 18 , 19 ], organic solvent scrubbing [ 20 , 21 ] and solid adsorbent adsorption separation [ 22 , 23 , 24 ]. The solid adsorbents, such as porous zeolites, carbon molecular sieves, titanium silicate, metal–organic frameworks, activated carbon and silica gel [ 25 , 26 , 27 ], presented many advantages of great separation efficiency and renewable capability and cost-effectiveness [ 28 ]. Generally, zeolites are more suitable for adsorbing acid gas, due to their distinctive microporous structure, excellent ion exchange behaviors and high adsorption ability [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Amphipathic Solvent-Assisted Synthetic Strategy for Random Lamellae of the Clinoptilolites with Flower-like Morphology and Thinner Nanosheet for Adsorption and Separation of CO2 and CH4

Jia

Sun

et al. 2023

Nanomaterials

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The random lamellae of the synthetic CP were synthesized with a hydrothermal approach using o-Phenylenediamine (OPD) as a modifier. The decreases in the order degree of the CP synthesized in the presence of the OPD resulted from the loss of long-range order in a certain direction. Subsequently, the ultrasonic treatment and washing were conducive to further facilitate the disordered arrangements of its lamellae. The possible promotion mechanism regarding the nucleation and growth behaviors of the sol-gel particles was proposed. The fractal evolutions of the aluminosilicate species with crystallization time implied that the aluminosilicate species became gradually smooth to rough during the crystallization procedures since the amorphous structures transformed into flower-like morphologies. Their gas adsorption and separation performances indicated that the adsorption capacity of CO2 at 273 K reached up to 2.14 mmol·g−1 at 1 bar, and the selective factor (CO2/CH4) up to 3.4, much higher than that of the CPs synthesized without additive OPD. The breakthrough experiments displayed a longer breakthrough time and enhancement of CO2 uptake, showing better performance for CO2/CH4 separation. The cycling test further highlighted their efficiency for CO2/CH4 separation.

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“…Adsorbents must have excellent properties, such as large adsorption capacity, good separation performance, easy regeneration, low cost, high mechanical strength, great abrasive resistance and so on [5,6]. At present, there are many kinds of adsorbents commonly used in gas separation, for example, activated carbons, carbon molecular sieves, zeolites, silica gels, metal-organic frameworks [7][8][9][10]. Among them, the studies about adsorption and separation of carbon dioxide and methane on carbonaceous adsorbent are the most common [11].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

Xue

Gong

Zeng

et al. 2021

Materialwissenschaft Werkst

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Adsorption and separation of carbon dioxide and methane on different carbonaceous adsorbents were analyzed and compared. Coconut shell‐based activated carbon has the highest adsorption capacity for two gases. Sips model describes the adsorption isotherms best. The separation factor on coconut shell‐based activated carbon is the highest under various conditions, reaching about 3.8. The adsorption capacity of the two gases is closely related to the specific surface area and micropore volume of the adsorbent. The adsorbed amount of each component in the mixture is less than that of the pure component under the same condition, indicating that there is a competition in the adsorption process. The total adsorbed amount of the two gases decreases as the proportion of carbon dioxide decreases, implying that the adsorption process is dominated by carbon dioxide adsorption. Additionally, the separation factor decreases with increasing temperature. Understanding the adsorption behaviors of pure and binary carbon dioxide and methane is important in treating biomass gas using carbonaceous adsorbents.

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Adsorption Separation of CO2/CH4 from Landfill Gas by Ethanolamine-Modified Silica Gel

Cited by 13 publications

References 27 publications

Preparation and characterization of activated carbon modified by potassium for carbon dioxide/methane adsorption and separation

Preparation and characterization of activated carbon modified by potassium for carbon dioxide/methane adsorption and separation

Amphipathic Solvent-Assisted Synthetic Strategy for Random Lamellae of the Clinoptilolites with Flower-like Morphology and Thinner Nanosheet for Adsorption and Separation of CO2 and CH4

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

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