Removal of C~2H~4 from a CO~2 Stream by Using AgNO~3-Modified Y-Zeolites

Removal of C2H4 from a CO2 stream is very important in ultrapurification of CO2 for its application and utilization. However, it is difficult to remove C2H4 completely from a CO2 stream via conventional cryogenic distillation because the volatility of C2H4 is similar to that of CO2. Another choice is the catalytic combustion method, but it is an energy-inefficient process, especially when it is coupled with the cryogenic distillation. Selective adsorption for removing C2H4 might be a promising alternative. A great effort has been made in C2H4/C2H6 separation and recovery of C2H4. There were, however, few reports about the removal of a trace amount of C2H4 from a CO2 stream. In this study, the AgNO3-modified NaY and HY zeolites are prepared and their adsorption performances are evaluated via a series of experiments of fixed-bed adsorption, frontal chromatographic adsorption, and temperature-programmed desorption (TPD). The structure of the sliver salt after being impregnated onto the supports has been char...