Effects of Pore Structure on n-Butane Adsorption Characteristics of Polymer-Based Activated Carbon

Abstract

In this study, the correlation between n-butane adsorption characteristics and pore characteristics of activated carbons (ACs) was investigated by activated polymer-based hard carbons (APHCs) using a carbon dioxide activation method. The structural characteristics of the ACs were observed by X-ray diffraction and Raman spectroscopy. The N 2 adsorption isotherm characteristics at 77 K were confirmed by Brunauer−Emmett−Teller, Barrett−Joyner−Halenda, and nonlocal density functional theory equations. From the results, specific surface areas and total pore volume of the ACs were determined to be 1020−2440 m 2 /g and 0.42−1.30 cm 3 /g, respectively. As the activation time increased, the fraction of micropores decreased from 85% to about 40%. On the other hand, the porosity of the mesopores increased to about 60% from a ratio of about 10%. The specific power adsorption has been increased with the development of the mesopores and exhibited 20 960 sK/g at APHC-10−5 (540% higher compared to that of APHC-10−2). It was confirmed that the correlation between the adsorption capacity of n-butane and the pore characteristics of the ACs was determined by pore diameter of 1.5−4.5 nm.

Pitch-Derived Activated Carbon Fibers for Emission Control of Low-Concentration Hydrocarbon

“…Primarily, the BA was strongly dependent on pores with diameters from 2.0 to 2.5 nm. This result is consistent with those in previous studies [15] showing that mesopores (2.0–2.5 nm) are essential for providing the butane adsorption capacity.…”

“…Especially, canister bleed emission limits have been set at 20 mg/test for passenger car [2]. In the past, fuel-vapor-emission control systems were studied to enhance the pore characteristics of activated carbon or to increase the apparent density in order to adsorb larger amounts of evaporation gas [15,16,17]. However, for the fuel-vapor-emission control systems that meet the new stringent regulations (LEV-III), it is necessary to develop activated carbon capable of adsorbing a larger amount of evaporation gas and of completely adsorbing low concentrations of evaporation gas at the same time [2].…”

The Effectiveness of Glucomannan and Nano Activated-Carbon as Hypercholesterol-Lowering Agents

“…As the activation time increases, micropores develop at the initial stage of activation. At the second stage, the micropores and the mesopores develop together, and at the third stage, the Remarks: (-) not specified; Max = maximum; Min = minimum; *) the result from an average of 3 replications; **) interchangeably in this aspect could be regarded as nano activated carbon material mesopores mainly develop with a decrease of the micropores (Lee et al, 2019). The increasing micropores surface area of the activated carbon, the adsorption capacity also increases (Ahmed et al, 2019).…”

Sorption and Textural Properties of Activated Carbon Derived from Charred Beech Wood

“…While the adsorption of CO 2 and C 2 H 4 at 303 K, 1 atm requires micropores up to 0.7 nm and 1.0 nm, respectively [11], butane adsorption requires wider pores [12,13]. Therefore, it can be used as a model gas in order to test the adsorption capacity for some similar molecules.…”