Preparation and optimization of carbon molecular sieves for carbon monoxide adsorption

The carbon monoxide is an important compound which can convert to different chemical materials which is harmful to environment and humans. Selecting the mechanism and absorbent to absorption pollutant gases is very important due to the efficiency. This study aimed to optimize the carbon molecular sieves prepared which cause the adsorption of more carbon monoxide.

In this study, a walnut shell was used to prepare a carbon molecular sieve and activate the carbon was used physical method. The adsorbents were optimized during two modifying and coating processes after granulation. The adsorbents were modified at pH = 4.5-6.5-9 which layered with oil-oil and oil-thinner mixtures (1: 1 ratio). The adsorption capacity of carbon monoxide by the adsorbents was measured by the volumetric method under the same conditions (2g of adsorbent, 25 °C temperature, and 2 bar pressure).

The highest efficiency among those without modified adsorbents for CMS (Ac) with 0.281 mmol CO/g adsorbents and among those coated with oil-kerosene adsorbents for CMS (Al-K) with 0/591 mmol CO/g adsorbent and among the adsorbents coated with oil -thinner and among all adsorbents for CMS (Al-T) with 0.858 mmol CO/g adsorbents.

A carbon molecular sieve can absorb and reduce the concentration of CO, which is an environmental pollutant. Optimization causes to increase the adsorption efficiency.