Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

Abstract

In this study, a carbon molecular sieve (CMS) was synthesized from walnut shells, followed by physical activation of the carbon content of the CMS. Adsorption of CO 2 and CH 4 onto raw and acid treated adsorbents were investigated using two sizes, 300-600 and 600-1180 μm. The adsorbents were impregnated with two solvent mixtures of waste engine oil with kerosene and with thinner at a proportion of 1:1 at 25 °C. The highest adsorption for CO 2 and CH 4 was obtained at the suitable size of a group of CMS (A) adsorbents, with acid treated adsorbents being more efficient than the raw adsorbents. The acid treated CMS (A-3) sample adsorbed 0.925 mol CO 2 g-1 and 0.353 mol CH 4 g-1. The results indicated that by decreasing the granulation size of group CMS (R) adsorbents, the adsorption capacities for CO 2 and CH 4 were reduced while increasing the granulation size of group CMS (A) adsorbents resulted in an enhancement in the adsorption capacity for CO 2 and CH 4. Moreover, acid treated adsorbents achieved enhanced adsorption capacity for CO 2 and CH 4. Further modifications reduced the adsorption capacity for CO 2 and CH 4 in impregnated adsorbents, due to a decrease in surface area, pore volume and pore size of the adsorbent.

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.…”