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The simplex optimization for high porous carbons preparation

100%
Sreńscek-Nazzal J., Michalkiewicz B.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 4
63-70
EN
The microporous carbon materials were prepared by chemical activation of Polish coal with potassium hydroxide using the simplex design method for planning the experiments. The experimental parameters were varied to identify the optimum conditions. Coal can be an excellent starting material for the preparation of high porous carbons for natural gas storage. The porosity of the resultant carbons was characterized by nitrogen adsorption (-196°C). Methane adsorption was investigated in a volumetric laboratory installation at range pressures from 1 to 3.5 MPa (25°C).The best results of methane storage capacity (557 cm3 · g-1) were obtained when using an impregnation ratio 3.41/1 KOH/precursor and temperature at 592°C, (SLANG = 2091 m2 · g-1). The parameters of the preparation of high porosity and high methane adsorption carbon were determined by a fast and simple method.
2
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Preparation of sorbents from selected polymers

88%
Ciesińska W., Makomaski G., Zieliński J., Brzozowska T.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 1
51-54
EN
In this work, the results of studies on the preparation of sorbents from selected polymers were presented. The polymers were carbonized and subsequently physically activated by steam or carbon dioxide, or alternatively, chemically activated with potassium hydroxide. For the obtained materials, a specific area was evaluated by means of low-temperature nitrogen adsorption and benzene adsorption, iodine number was also determined. The obtained results indicated a possibility to procure hydrophobic sorbents of microporous structure. Sorbents having the best properties, i.e. the specific area of above 2000 m2/g were produced from poly(ethylene terephthalate) and phenol-formaldehyde resin.
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Adsorption of bisphenol a from aqueous solutions by activated tyre pyrolysis char – Effect of physical and chemical activation

75%
Kuśmierek K., Świątkowski A., Kotkowski T., Cherbański R., Molga E., Kuśmierek K., Świątkowski A., Kotkowski T., Cherbański R., Molga E.
Chemical and Process Engineering
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2020
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vol. 41
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issue 2
4
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Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

75%
Fałtynowicz H., Kaczmarczyk J., Kułażyński M.
Open Chemistry
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2015
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vol. 13
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issue 1
EN
Activated carbons from biomass material of giant knotweed Reynoutria sachalinensis (F. Schmidt ex Maxim.) Nakai were obtained. Use of this plant for manufacturing activated carbon has not been studied yet. Therefore, the first activated carbons of giant knotweed origin are described. Both physicochemical (by steam and CO2) and chemical (by KOH) activation methods were applied. Influences of temperature (500, 600, 700 and 800°C), burn-off [10, 25 and 50 wt. % (daf)] and KOH concentration on pores surface area and volume distribution of the obtained activated carbons were explored. Porosity of the elaborated sorbents was determined by benzene and carbon dioxide sorption measurements. Sorbents obtained by steam activation were micro- and mesoporous with surface area and volume of pores increasing with temperature and burn-off to V = 0.351 cm3 g-1 and S = 768 m2 g-1 at 800°C at 50% burn-off. Carbon dioxide activation resulted with notably microporous activated carbons with porous texture parameters also increasing with burn-off to V = 0.286 cm3 g-1 and S = 724 m2 g-1 at 50% burn-off. The highest BET surface area of 2541 m2 g-1 was achieved when chemical (KOH) activation was performed using KOH to char ratio 4:1.
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