Improvement of CO 2 uptake of activated carbons by treatment with mineral acids

Gęsikiewicz-Puchalska, Andżelika; Zgrzebnicki, Michał; Michalkiewicz, Beata; Narkiewicz, U.; Morawski, Antoni W.; Wróbel, Rafał

doi:10.1016/j.cej.2016.10.005

Cited by 58 publications

(21 citation statements)

References 56 publications

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“…The isotherms of the other adsorbents belong to the combination of type I and type IV, implying that the adsorbents are mainly composed of micropores and a certain amount of mesopores and macropores. Similar phenomena have been reported in other literatures [32,33].…”

Section: Pore Structure Of Carbonaceous Adsorbentssupporting

confidence: 92%

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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Section: Pore Structure Of Carbonaceous Adsorbentssupporting

confidence: 92%

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

Xue

Gong

Zeng

et al. 2021

Materialwissenschaft Werkst

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“…Compared to petcoke, however, the pore widths in samples P-N-24 and P-N/S-24 decreased, and those in sample P-S-24 increased. As shown in Table 2, the ash contents decreased after acid treatments, and, thus, the removal of some of the inorganic material in petcoke likely contributed to the increased microporosity [38]. Although the added surface groups may enhance the interaction with CO2 [37,39], these groups may also block some pores [40][41][42].…”

Section: Physical Properties Of Petcoke Treated With Various Acidsmentioning

confidence: 99%

Nitric Acid Functionalization of Petroleum Coke to Access Inherent Sulfur

et al. 2020

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Sulfonated carbon-based catalysts have been identified as promising solid acid catalysts, and petroleum coke (petcoke), a byproduct of the oil industry, is a potential feedstock for these catalysts. In this study, sulfur-containing (6.5 wt%) petcoke was used as a precursor for these catalysts through direct functionalization (i.e., without an activation step) with nitric acid to access the inherent sulfur. Catalysts were also prepared using sulfuric acid and a mixture of nitric and sulfuric acid (1:3 vol ratio). Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and titration were used to identify and quantify the acid sites. The activities of the prepared catalysts were determined for the esterification of octanoic acid with methanol. Petcoke had few −SO3H groups, and correspondingly no catalytic activity for the reaction. All acid treatments increased the number of −SO3H groups and promoted esterification. Treatment with nitric acid alone resulted in the oxidation of the inherent sulfur in petcoke to produce ~0.7 mmol/g of strong acid sites and a total acidity of 5.3 mmol/g. The acidity (strong acid and total) was lower with sulfuric acid treatment but this sample was more active for the esterification reaction (TOF of 31 h−1 compared to 7 h−1 with nitric acid treatment).

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“…Productions of many different carbonaceous materials have been developed e.g. carbon spheres 5,6 , hierarchical porous carbon nanosheets 7 , exfoliated graphitic carbon nitride 8 , TiO 2 -loaded carbon fi ber cloths 9 , hybrid carbon-TiO 2 spheres 10 , TiO 2 -reduced graphene oxide 11,12 , carbon nanotubes 13,14 , nano carbon black 13 , activated carbon [15][16][17][18][19] . Carbonaceous materials have found a multifunctional application in the fi elds of catalysis 20-28 , photocatalysis 8, 9, 12, 29 , water treatment 11 , supercapacitors 7 , energy storage 30 , electrochemical sensor 13 , sorption 5, 16, 18, 19, 31 and so on.…”

Section: Introductionmentioning

confidence: 99%

Fe-modified activated carbon obtained from biomass as a catalyst for α-pinene autoxidation

Kamińska

Maciejewska

Miądlicki

et al. 2021

Polish Journal of Chemical Technology

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The presented work describes the autoxidation of alpha-pinene for the first time using a catalyst based on activated carbon from biomass with introduced Fe. The raw material for the preparation of the carbon material was waste orange peel, which was activated with a KOH solution. The following instrumental methods characterized the obtained catalyst (Fe/O_AC):N2 adsorption at 77 K, XRD, UV, SEM, TEM, X-ray microanalysis, and catalytic studies. It was shown that the Fe/O_AC catalyst was very active in the autoxidation of alpha-pinene. The main reaction products were: alpha-pinene oxide, verbenone, verbenol, and campholenic aldehyde.

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Improvement of CO 2 uptake of activated carbons by treatment with mineral acids

Cited by 58 publications

References 56 publications

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

Nitric Acid Functionalization of Petroleum Coke to Access Inherent Sulfur

Fe-modified activated carbon obtained from biomass as a catalyst for α-pinene autoxidation

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