Co-removal of toluene in NH₃-SCR unit over Mn based catalysts is desirable but still faces the big challenge of byproduct greenhouse gas N₂O. In this work, the impacts of toluene on N₂O formation mechanism was studied. The main N₂O formation pathways in NH₃-SCR over Mn-Fe spinel were NH₃ oxidation and non-catalytic selective reduction (NSCR), in which NSCR dominated below 250 °C. The N₂O from NSCR through both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms was confirmed. And the E-R mechanism was dominant at 200 °C. Toluene was effectively co-removed with NO_x with the advantage of N₂O inhibition. Toluene suppressed N₂O generation from both NH₃ oxidation and NSCR. NH₃ oxidation by gaseous O₂ and catalyst surface oxygen was all limited by toluene, resulting in less adsorbed NH that was further proved by the larger energy barriers of NH₃*→NH₂* and NH₂*→NH* on toluene pre-adsorbed catalyst surface. NO oxidation was also limited, suppressing the generation of adsorbed NO₃⁻. Due to the inhibition of NH₃ and NO activation to key intermediates NH and NO₃⁻, respectively, the N₂O generation from E-R route was slightly decreased in the presence of toluene, while that from L-H route was completely prohibited at 200 °C.

在NH ₃ -SCR单元中通过Mn基催化剂共除去甲苯是理想的，但仍然面临着副产物温室气体N ₂ O的巨大挑战。在这项工作中，研究了甲苯对N ₂ O形成机理的影响。Mn-Fe尖晶石上NH ₃ -SCR中主要的N ₂ O形成途径为NH ₃氧化和非催化选择性还原（NSCR），其中NSCR在250°C以下占主导地位。确认了来自NSCR的N ₂ O通过Eley-Rideal（ER）和Langmuir-Hinshelwood（LH）机制。ER机制在200°C时占主导地位。借助N _2可以有效地将甲苯与NO _x共同脱除O抑制。甲苯抑制Ñ ₂从两个NH阿代₃氧化和NSCR。气态O ₂和催化剂表面氧对NH _3的氧化均受甲苯的限制，从而减少了NH的吸附，这进一步得到了NH ₃ *→NH ₂ *和NH ₂ *→NH *在甲苯预分离塔上的较大能垒的进一步证明。吸附的催化剂表面。NO氧化反应也受到限制，从而抑制吸附NO的产生₃ ^- 。由于NH的抑制₃和NO激活到关键中间体NH和NO ₃ ^- ，分别，将N ₂在甲苯存在下，ER途径的O生成量略有减少，而LH途径的O生成在200°C时被完全禁止。