Comparison of Improvement Efficiency of Alumina and Zeolite Using Piperazine Solution for Carbon Dioxide Adsorption

In this research, zeolite and active alumina adsorbents were modified to increase the absorption of carbon dioxide using piperazine solution. The effect of different operating conditions including temperature, pressure, amount of adsorbent, particle size, and concentration of piperazine solution on the adsorption process were investigated. The results of the adsorption experiments showed that, with increasing pressure and decreasing temperature, the adsorption rate increased, and the highest amount of carbon dioxide absorption was at 25 ° C, 8 bar, 1 g of adsorbent, 200 micron particles, and 2% concentration weight is piperazine. Absorption capacity for active alumina increased from 166.516 to 222 mg/g, absorbent for zeolite 13X from 194.844 to 244.084 mg/g. In general, the modified 13X zeolite adsorbent has a higher absorbance compared to modified activated alumina, but it also increases the level of absorption of active alumina. Thus, according to the results of this study, modified adsorbents with piperazine have a good effect on carbon dioxide absorption. At high temperatures, it also increases the absorption rate of the absorbent material.