Metal oxide supported on activated carbon was used to remove low concentration NO at room temperature.Activated carbon was pretreated by oxidant before use.After nitrate acid treatment，both carbonyl and nitro groups on the surface of activated carbon increased，and the capacity of removing NO also increased significantly.The activated carbon treated by nitrate acid was then deposited with metal oxide to further improve NO removal efficiency.It was found that samples containing Ce and Co oxide show the longest NO breakthrough time and highest removal capacity.Further study shows the final form of removed NO is metal nitrate，indicating that NO was first oxidized to NO2 when passing through the sorbent and then reacted with the supported metal oxide.