It is a great challenge to achieve high efficiency and low energy consumption denitrification without adding reducing agent at low temperature. Herein, we developed MgCo₂O₄-BaCO₃/AC carbon-based composites as novel and cheap adsorbents with high adsorption capacity to fill the first section of two-stage fixed-bed reactor to form adsorption bed, and MgCo₂O₄-40%BaCO₃ as catalyst was filled in the second section as catalyst bed. Significantly, under the condition of excess O₂, the adsorption capacity of 20%MC-0.5Ba/AC for NO was as high as 40.2 mg/g, and the conversion of adsorbed NO was as high as 99.7% under microwave irradiation at 250 °C. The denitrification efficiency of the two-stage fixed bed reactor was much higher than that of the one-stage fixed bed reactor. The energy efficiency of adsorption-decomposition method was 14 times higher than that of direct decomposition method. Interestingly, the activated carbon was not consumed during the whole reaction process, so no secondary pollution such as CO and CO₂ was produced. More importantly, despite the presence of SO₂, CO₂ or H₂O in the inlet gas, 20%MC-0.5Ba/AC still showed excellent adsorption capacity for NO, and the absorbed NO could be successfully decomposed, demonstrating excellent resistance to SO₂, CO₂ and H₂O. This work presents a new route for denitrification technology with high efficiency, low energy consumption and no secondary pollution, and provides guidance for rational design of adsorbents with high adsorption capacity for NO.

在低温下不添加还原剂实现高效低耗的反硝化是一个巨大的挑战。在此，我们开发了MgCo ₂ O ₄ -BaCO ₃ /AC碳基复合材料作为新型廉价的吸附剂，具有高吸附容量，填充两级固定床反应器的第一段形成吸附床，MgCo ₂ O ₄ -在作为催化剂床的第二段中填充40%BaCO _{3作为催化剂。值得注意的是，在 O 2}过量的情况下，20%MC-0.5Ba/AC对NO的吸附量高达40.2 mg/g，在250℃微波照射下吸附的NO转化率高达99.7%。二级固定床反应器的脱硝效率远高于一级固定床反应器。吸附分解法的能源效率比直接分解法高14倍。有趣的是，整个反应过程中活性炭并没有被消耗，因此没有产生CO和CO _{2等二次污染。}更重要的是，尽管存在 SO ₂、CO ₂或 H ₂入口气体中的 O，20%MC-0.5Ba/AC 对 NO 仍然表现出优异的吸附能力，吸附的 NO 可以被成功分解，表现出优异的对 SO 2 、CO 2 和_H 2 _O的_抵抗能力。这项工作提出了一个新的高效率、低能耗、无二次污染的反硝化技术路线，为合理设计高吸附NO的吸附剂提供指导。