The Fe-based microwave coconut shell activated carbon (Fe/MCSAC) catalyst was surface modified by O₂- and NH₃-plasma. The catalyst modified by O₂-plasma showed a lower catalytic activity than the unmodified sample, but the catalyst modified by NH₃-plasma was improved dramatically. Fourier Transform Infrared Spectroscopy (FTIR) results showed that -COOH and -NH₂ groups can be generated after by O₂- and NH₃-plasma modification, respectively. The theoretical calculation results indicated that acidic -COOH group showed some inhibition to the hydrolysis of carbonyl sulfide (COS), but -NH₂ could improve it by bonding with the H atoms of H₂O.

Fe基微波椰壳活性炭（Fe / MCSAC）催化剂经O _2-和NH _3-等离子体表面改性。O _2-等离子体改性的催化剂显示出比未改性样品更低的催化活性，但是NH _3-等离子体改性的催化剂得到了显着改善。傅立叶变换红外光谱（FTIR）结果表明，分别通过O _2-和NH _3-等离子体改性可以生成-COOH和-NH ₂基团。理论计算结果表明，酸性-COOH基团对羰基硫（COS）的水解有一定的抑制作用，而-NH ₂通过与H ₂ O的H原子键合可以改善它。