Effect of Relative Humidity on Adsorption Breakthrough of CO2 on Activated Carbon Fibers

Chiang, Yu‐Chun; Chen, Yu-Jen; Wu, Chien-Hsing

doi:10.3390/ma10111296

Cited by 58 publications

(27 citation statements)

References 52 publications

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“…We observed that the S BET and V total of ANFs were enhanced by either activation time or the quantity of the activation reagent. However, after impregnation with TEPA, the S BET and V total were reduced proportionately, an observation that is consistent with those of other studies [11,14]. In particular, micropores of the chemically activated ANFs undetectable because the percolation of the TEPA solution blocked the tiny pores.…”

Section: Measurement Of Co 2 Adsorption Capacitysupporting

confidence: 90%

“…However, upon the impregnation of TEPA (60-ANF-TEPA), there was a significant increase in the pyridinic and quaternary N-groups, possibly derived from the total conversion of shake-up satellites and adsorbed NO 2 . Such observation which implied that the linear TEPA resulted in the increase of pyridine-like structures or six-member or five-member rings [14]. As expected, HNO 3 oxidation evinced lowering of basic N-groups (pyridines), while the least basic groups (shake-up satellites and adsorbed NO 2 ) were re-introduced to the ANFs.…”

Section: Chemical Properties Of the Anfssupporting

confidence: 56%

“…Figure 6 shows the best curve fit for the high resolution XPS N 1s spectra of all samples, while Table 4 lists the percentage of nitrogen-containing functional groups. The primary surface nitrogen groups found on the ANFs were pyridine-type (BE = 398.1 eV), pyridone and pyrrole (BE = 400.3 eV), quaternary-N (BE = 401.5 eV), oxidized-N (BE = 402.8 eV) [28], and chemisorption of NO 2 at 405 eV [14]. Pyridinic and pyridine/pyrrole N were the two dominant N-groups found on the 60-ANF.…”

Section: Chemical Properties Of the Anfsmentioning

confidence: 98%

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TEPA impregnation of electrospun carbon nanofibers for enhanced low-level CO2 adsorption

Wang

Adelodun

et al. 2020

Nano Convergence

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The CO 2 adsorption selectivity of plain activated carbon nanofibers (ANF) is generally low. For enhancement, nitrogen functionalities favorable for CO 2 adsorption are usually tethered to the ANF. In the current study, we adopted chemical impregnation using 0.5 wt% tetraethylenepentamine (TEPA) solution as an impregnant. To enhance the impregnation of TEPA further, preliminary oxidation of the nanofibers with 70% HNO 3 was conducted. The effects of HNO 3 and TEPA treatments on the modified ANFs were investigated for physical (using N 2 monosorb, thermogravimetric analyzer, scanning electron microscopy) and chemical (X-ray photoelectron spectrometer) changes. From the results, we found that although TEPA impregnation reduced the specific surface area and pore volume of the ANFs (from 673.7 and 15.61 to 278.8 m 2 /g and 0.284 cm 3 /g, respectively), whereas the HNO 3 pre-oxidation increased the number of carboxylic groups on the ANF. Upon TEPA loading, pyridinic nitrogen was tethered and further enhanced by pre-oxidation. The surface treatment cumulatively increased the amine content from 5.81% to 13.31%. Consequently, the final adsorption capacity for low (0.3%) and pure CO 2 levels were enhanced from 0.20 and 1.89 to 0.33 and 2.96 mmol/g, respectively. Hence, the two-step pre-oxidation and TEPA treatments were efficient for improved CO 2 affinity.

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Section: Measurement Of Co 2 Adsorption Capacitysupporting

confidence: 90%

Section: Chemical Properties Of the Anfssupporting

confidence: 56%

Section: Chemical Properties Of the Anfsmentioning

confidence: 98%

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TEPA impregnation of electrospun carbon nanofibers for enhanced low-level CO2 adsorption

Wang

Adelodun

et al. 2020

Nano Convergence

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“…To summarize how activation by KOH takes place, three main methods take place [16]: 1) Chemical activation which involves redox reactions between Potassium compounds and the carbon material which results in the formation of a porous structure.…”

Section: Activation Mechanismmentioning

confidence: 99%

Synthesis and Characterization of Porous Carbon from Petroleum Pitch Using KOH

Srinivasakannan¹,

El-Mootassem²,

Reddy³

et al. 2018

MSCE

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Preparation and process optimization of porous carbons using different carbon sources and activating agents are frequently and commonly reported in open literature. However, only scanty references are made on utilization of petroleum coke for conversion to high surface area porous carbon using KOH as the activating agent. Hence, the present work attempts a process optimization exercise to prepare high surface area porous carbon from Petroleum coke using chemical activation (KOH) utilizing design of experiments. The effect of activation temperature, petroleum coke to KOH ratio (KPR) and activation duration were assessed on the surface area and yield of the porous carbon. The process optimization was performed covering experimental parameters in the range of 500˚C-800˚C, 2-5 and 30-120 min. The optimal process conditions for maximizing the yield and BET surface area was identified to be an activation temperature of 639˚C, KPR of 4.5 and activation duration of 43 min, having BET surface area 1765 m 2 /g and yield of 89.8%. However, an attempt to maximize only the BET surface area, ignoring yield has resulted with a porous carbon with maximum surface area of 2061 m 2 /g, with the optimal process conditions being an activation temperature of 688˚C, KPR of 3.8 and activation duration of 74 min, with the corresponding yield of only 77%. The characterization of porous carbon was performed using nitrogen adsorption isotherm, FT-IR and SEM analysis.

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“…The current CO 2 emission reduction technologies are mainly divided into four ways: pre-combustion decarbonization [2,3], chemical chain circulation [4,5], pure oxygen combustion [6,7], and post-combustion capture [8,9,10,11]. Among them, CO 2 capture and storage (CCS) technology has been widely used [12,13,14,15], but its cost is high [16,17]. However, alkali metal carbonates such as Na 2 CO 3 and K 2 CO 3 have become the promising CO 2 adsorbents due to their low cost, low secondary pollution, and high cycle efficiency [18,19].…”

Section: Introductionmentioning

confidence: 99%

Study on Adsorption Mechanism and Failure Characteristics of CO2 Adsorption by Potassium-Based Adsorbents with Different Supports

Fan

Wang

et al. 2018

Materials

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In order to obtain the adsorption mechanism and failure characteristics of CO2 adsorption by potassium-based adsorbents with different supports, five types of supports (circulating fluidized bed boiler fly ash, pulverized coal boiler fly ash, activated carbon, molecular sieve, and alumina) and three kinds of adsorbents under the modified conditions of K2CO3 theoretical loading (10%, 30%, and 50%) were studied. The effect of the reaction temperature (50 °C, 60 °C, 70 °C, 80 °C, and 90 °C) and CO2 concentration (5%, 7.5%, 10%, 12.5%, and 15%) on the adsorption of CO2 by the adsorbent after loading and the effect of flue gas composition on the failure characteristics of adsorbents were obtained. At the same time, the microscopic characteristics of the adsorbents before and after loading and the reaction were studied by using a specific surface area and porosity analyzer as well as a scanning electron microscope and X-ray diffractometer. Combining its reaction and adsorption kinetics process, the mechanism of influence was explored. The results show that the optimal theoretical loading of the five adsorbents is 30% and the reaction temperature of 70 °C and the concentration of 12.5% CO2 are the best reaction conditions. The actual loading and CO2 adsorption performance of the K2CO3/AC adsorbent are the best while the K2CO3/Al2O3 adsorbent is the worst. During the carbonation reaction of the adsorbent, the cumulative pore volume plays a more important role in the adsorption process than the specific surface area. As the reaction temperature increases, the internal diffusion resistance increases remarkably. K2CO3/AC has the lowest activation energy and the carbonation reaction is the easiest to carry out. SO2 and HCl react with K2CO3 to produce new substances, which leads to the gradual failure of the adsorbents and K2CO3/AC has the best cycle failure performance.

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Effect of Relative Humidity on Adsorption Breakthrough of CO2 on Activated Carbon Fibers

Cited by 58 publications

References 52 publications

TEPA impregnation of electrospun carbon nanofibers for enhanced low-level CO2 adsorption

TEPA impregnation of electrospun carbon nanofibers for enhanced low-level CO2 adsorption

Synthesis and Characterization of Porous Carbon from Petroleum Pitch Using KOH

Study on Adsorption Mechanism and Failure Characteristics of CO2 Adsorption by Potassium-Based Adsorbents with Different Supports

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