非热等离子体协同锰铁双金属催化剂直接催化还原 NO

Although the traditional ammonia selective catalytic reduction (NH₃-SCR) has been widely used in the removal of atmospheric pollutant NO, there are still some flaws such as catalyst toxicity, high and narrow operating temperature, and ammonia emission. Herein, the manganese-iron bimetallic catalyst supported on SBA-15 molecular sieve was prepared by the impregnation method, and the performance of the manganese-iron catalyst to directly decompose NO under non-thermal plasma at low temperature was investigated. The activity test results showed that the NO conversion reached 97.8% when the plasma output voltage was 12kV at room temperature. The characterization results showed that the pore structure and physical morphology of the catalyst did not change significantly after the reaction. The online mass spectrometry analysis results showed that under the synergistic catalysis of plasma, NO was directly decomposed into N₂ and O₂. The mechanism analysis showed that the electron transfer between different valence Mn species weakened the N—O bond of the NO adsorbed on catalyst surface, and the energy consumption of the plasma to decompose NO was also reduced.