Abstract: 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.

Key words: low concentration NO, activated carbon, metal oxide, room temperature

摘要： 在活性炭上负载了金属氧化物用于低浓度NO在常温下的脱除。活性炭在使用之前经过了氧化预处理，经过硝酸氧化处理后，活性炭表面的羰基和硝基数量均增加，对NO的脱除能力显著提高。在硝酸处理后的活性炭上负载了金属氧化物，其中Ce和Co负载的样品对NO的脱除效果最佳，与未负载的样品相比脱除量提高了约8倍。进一步研究发现被脱除的NO最终以金属硝酸盐的形式存在，说明NO在通过催化氧化吸附剂层时首先被氧化生成NO2，之后NO2与负载的金属氧化物反应生成了金属硝酸盐。

关键词: 低浓度NO, 活性炭, 金属氧化物, 常温