Adsorption Properties of N₂, CH₄, and CO₂ on Sulfur-Doped Microporous Carbons

Abstract

A series of sulfur-doped microporous carbon materials were prepared by directly using potassium hydroxide as the activating agent. The specific surface area and pore volume of the sample CKS-5 (activated at 800 °C for 180 min according to an alkali/carbon ratio of 4:1) reached 2088 m2/g and 1.240 cm3/g, respectively. The adsorption isotherms of N2, CH4, and CO2 on five samples were determined by a volumetric method to obtain insight into the relationship between adsorption performance and porosity. CSK-5 with a developed pore structure exhibited a higher adsorption amount of CO2 and CH4 at high pressure. For the selectivity, the CS sample presented the highest selectivity for CO2/CH4, of which the selectivity of separation reached as high as 5.86. The highest selectivity of separation of CH4/N2 (3.644) was present on CSK-7.

Separation and Purification of Hydrocarbons with Porous Materials

“…[ 11a , 12a ] In recent years, heteroatom‐doped porous carbons and activated carbons derived from biomass have been explored. [ 13b , 13e , 14c , 39 ] N‐rich microporous carbons derived from N‐containing polymers were obtained by a solvent‐free method; they possessed narrow pore size distributions (ca. 0.5–3 nm) and achieved an IAST CH 4 /N 2 selectivity of up to 5.1 at 298 K and 1 bar.…”

Separation and Purification of Hydrocarbons with Porous Materials

“…In earlier studies, porous carbons were treated by loading other chemicals, such as Br 2 , ICl, or MoO 2 , onto the adsorbents to improve their CH 4 /N 2 separation performance [11a, 12a] . In recent years, heteroatom‐doped porous carbons and activated carbons derived from biomass have been explored [13b,e, 14c, 39] . N‐rich microporous carbons derived from N‐containing polymers were obtained by a solvent‐free method; they possessed narrow pore size distributions (ca.…”

Adsorption and separation of carbon dioxide and methane on carbonaceous adsorbents

“…Among them, the studies about adsorption and separation of carbon dioxide and methane on carbonaceous adsorbent are the most common [11]. There are many kinds of carbonaceous adsorbents used for adsorption and separation of carbon dioxide and methane, which have different perfomance [12][13][14][15][16][17][18]. The selection of appropriate adsorbents is very important to the effect of adsorption and separation.…”