Removal of COS from N_2 by adsorption on PEI/SBA-15

Removal of low concentration COS from N2 is studied by PEI modified SBA-15 as the adsorbent.Effect of the loading amounts,adsorption temperature and impurity gas on COS adsorption of these adsorbents is studied.The adsorbents are characterized by XRD,chemisorb analyzer and FT-IR.After PEI loading the structure of SBA-15 remained unchanged and a significant decrease in surface area is observed.FT-IR spectra show that chemical adsorption occurred.The results show that 50% PEI/SBA-15 has the most perfect adsorption performance at 28℃.The breakthrough sulfur capacity is 5.383 mg/g,and saturated sulfur capacity is 11.698 mg/g.The breakthrough sulfur capacity and saturated sulfur capacity could respectively increase to 11.724 mg/g and 32.38 mg/g when the adsorption temperature is 60℃.In addition,H2S is found by GC when the adsorption temperature is 50℃,60℃,70℃.This show that chemical adsorption occurred.The 4.9 mL/L CO2 in N2 tremendously decreases the COS adsorption capacity.The adsorbent can be regenerated by N2 at 100℃.