A series of manganese-cerium-based (MnO-CeO) polyphenylene sulfide (PPS) catalytic filters were prepared via a redox method to enhance catalytic activity and physico-chemical performances. The oxidation regularity of the cerous ion (Ce) was revealed through controlling KMnO content, based on which a Mn-Ce catalyst system and its corresponding redox equation were established. Furthermore, the preparation of the optimal catalytic filter achieved satisfactory catalytic performance compared with the previous catalytic filters (NO conversion of 93.5 % at 180 °C under low load conditions). This catalytic filter also exhibits excellent catalyst stability, gas permeability, bonding strength, and mechanical properties, making it suitable for complex operating conditions. Particularly, the coexistence of CeO and CeO in the catalyst system leads to an imbalance in surface charge, oxygen vacancies, and unsaturated chemical bonds on the surface of the catalyst, thereby increasing the amount of chemisorbed oxygen, promoting NO oxidation, and further improving selective catalytic reduction of NO with NH (NH-SCR).

中文翻译：

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揭示低温NH3-SCR催化过滤器中Mn-CeO2-x催化剂体系的反应规律

通过氧化还原方法制备了一系列锰铈基（MnO-CeO）聚苯硫醚（PPS）催化过滤器，以提高催化活性和物理化学性能。通过控制KMnO含量揭示了铈离子(Ce)的氧化规律，并在此基础上建立了Mn-Ce催化剂体系及其相应的氧化还原方程。此外，与之前的催化过滤器相比，制备的最优催化过滤器取得了令人满意的催化性能（低负荷条件下180℃时NO转化率为93.5%）。该催化过滤器还表现出优异的催化剂稳定性、透气性、粘合强度和机械性能，使其适用于复杂的操作条件。特别是催化剂体系中CeO和CeO的共存，导致催化剂表面电荷、氧空位和不饱和化学键的不平衡，从而增加化学吸附氧量，促进NO氧化，进一步提高选择性用 NH 催化还原 NO (NH-SCR)。