In this paper, the reaction behaviors of CH₃CN catalytic combustion over CuCeO_x-HZSM-5 catalysts prepared by the physical mixing and wet impregnation methods were investigated. The experimental results had revealed that the composite catalysts exhibited excellent degradation efficiency and high N₂ selectivity: the Cu-Ce oxides ensured the high activity, and the introduction of HZSM-5 limited the formation of NO_x. The involved reaction mechanism was then studied by an in situ DRIFT analysis. It could be deduced that different reaction pathways would occur over CuCeO_x and HZSM-5. The catalytic reaction over CuCeO_x mainly proceeded via an oxidation pathway. The CN group could be converted to isocyanate species [NCO(a)] which would be further oxidized to NO_x. Over HZSM-5, CH₃CN was mainly hydrolyzed into ammonia. For the CuCeO_x-HZSM-5 composite catalysts, the over-oxidation of NCO(a) and NH₃ was inhibited, and an internal selective catalytic reduction (SCR) reaction could occur, thereby greatly improving the N₂ selectivity.

研究了物理混合和湿法浸渍法制备的CuCeO _x -HZSM-5催化剂上CH ₃ CN催化燃烧的反应行为。实验结果已经表明，该复合催化剂表现出优异的降解效率和高氮₂选择性：所述Cu-的Ce氧化物确保了高的活性，并引入HZSM-5的限制NO的形成_X。然后通过原位DRIFT分析研究了所涉及的反应机理。可以推断出在CuCeO _x和HZSM-5上会发生不同的反应途径。CuCeO _x上的催化反应主要通过氧化途径进行。CN基团可以转化为异氰酸酯类[NCO（a）]，后者会进一步氧化成NO _x。在HZSM-5上，CH ₃ CN主要水解成氨。对于CuCeO _x -HZSM-5复合催化剂，可以抑制NCO（a）和NH ₃的过度氧化，并且可以发生内部选择性催化还原（SCR）反应，从而大大提高了N _2的选择性。