The sulphur resistance and regeneration strategy of soot oxidation catalysts are critical to the application of catalytic diesel particulate filters (CDPFs). In the present work, Pt/MnO_x–CeO₂/Al₂O₃, Pt/Al₂O₃ and MnO_x–CeO₂/Al₂O₃ catalysts were sulphated and regenerated with ammonia. The soot oxidation activity of poisoned Pt/MnO_x–CeO₂/Al₂O₃ was recovered completely after 30 min reduction in 500 ppm NH₃ at 550 °C. The amount, distribution and structure of sulphates were studied comprehensively for the sulphated and regenerated samples by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, CO chemisorption and transmission electron microscopy (TEM). The NO oxidation of Pt catalysts was found to depend strongly on the particle size distribution, surface exposure and oxidation state of the precious metal. This, as well as the effect of the remaining surface sulphates, helped the regenerated catalysts achieve even higher catalytic activity for soot oxidation.

中文翻译：

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Pt / MnO _x –CeO ₂ / Al ₂ O ₃催化剂在NO _x辅助烟灰氧化中的硫化和氨气再生†

烟尘氧化催化剂的抗硫性和再生策略对于催化柴油颗粒过滤器（CDPF）的应用至关重要。在目前的工作中，Pt / MnO _x -CeO ₂ / Al ₂ O ₃，Pt / Al ₂ O ₃和MnO _x -CeO ₂ / Al ₂ O ₃催化剂被硫酸化并用氨再生。在500 ppm NH _3中还原30分钟后，完全恢复了中毒的Pt / MnO _x –CeO ₂ / Al ₂ O ₃的烟灰氧化活性。在550°C下。通过热重分析（TGA），红外（IR）光谱，CO化学吸附和透射电子显微镜（TEM）对硫酸盐和再生样品中硫酸盐的含量，分布和结构进行了全面研究。发现Pt催化剂的NO氧化强烈地依赖于粒度分布，表面暴露和贵金属的氧化态。这以及剩余的表面硫酸盐的作用，帮助再生的催化剂实现了更高的烟灰氧化催化活性。