Study of the CO2 Adsorption Performance of a Metal-Organic Frameworks: Applications in Air Conditioning

Air conditioning systems introduce fresh outdoor air mainly to dilute indoor CO2 and meet the high demand for interior environment quality. However, in some cases, introducing fresh outdoor air cannot be done, because of high pollution of the outdoor air or because there is no fresh air. In these cases, limiting CO2 concentration can be done only through adsorption devices. In this study, innovative metal-organic frameworks (MOFs) were employed as adsorbents to handle CO2 independently in air conditioning systems. Three different MOFs, MIL-101 (Cr), MIL-101 (Fe), and MIL-100 (Fe), were compared using a dynamic adsorption experimental device. The dynamic adsorption patterns of CO2 on the three adsorption materials and the corresponding performance index parameters were obtained. According to the experimental findings, when the temperature was raised from 298 K to 313 K, the adsorption breakthrough times for CO2 on the three adsorbent materials decreased from 590 s, 470 s, and 295 s to 305 s, 270 s, and 160 s, respectively. When the relative humidity was 30 % and 60 %, the carbon dioxide removal capacity of MIL-100(Fe) increased to 1.92 and 1.79 times that under dry conditions.