Abstract: α-FeOOH nanoparticles were prepared using homogeneous precipitation and ammonia titration methods. The catalytic activity of the catalysts using α-FeOOH nanoparticle as active ingredient for COS hydrolysis were tested by a microreactor-chromatography assessing apparatus at the atmospheric pressure in the temperature range from 25 ℃～60 ℃ with gas hourly space velocity 10 000 h－1. The performance of the catalysts for H2S removal was investigated by means of thermal gravimetric method. The results show that the nanoparticle-based catalyst is highly active for COS hydrolysis at low temperature at high space velocity. Conversion of COS can attain 100% by use of series Ⅰ and Ⅱ catalysts at 60 ℃ and 40 ℃～45 ℃ respectively. The highest saturated sulfur capacity for H2S can reach 21.72% at 60 ℃. Further, it is also observed that the surface energy distribution on the catalysts is heterogeneous and a compensation effect exists.