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首页> 外文期刊>Catalysis science & technology >Sulphation and ammonia regeneration of a Pt/MnOx-CeO2/Al2O3 catalyst for NOx-assisted soot oxidation
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Sulphation and ammonia regeneration of a Pt/MnOx-CeO2/Al2O3 catalyst for NOx-assisted soot oxidation

机译：硫酸化和氨的再生Pt / MnOx-CeO2 /氧化铝催化剂NOx-assisted烟尘氧化

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摘要

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/MnOx-CeO2/Al2O3, Pt/Al2O3 and MnOx-CeO2/Al2O3 catalysts were sulphated and regenerated with ammonia. The soot oxidation activity of poisoned Pt/MnOx-CeO2/Al2O3 was recovered completely after 30 min reduction in 500 ppm NH3 at 550 degrees 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.
机译：抗硫和再生策略烟尘的氧化催化剂至关重要应用催化柴油微粒过滤器(CDPFs)。催化剂硫酸化和再生氨。Pt / MnOx-CeO2 /氧化铝后完全恢复30分钟减少500 ppm NH3在550摄氏度。的数量、分布和结构全面的研究了硫酸盐硫酸化和再生的样本热重分析(TGA)、红外(IR)光谱学、CO化学吸收作用和传播电子显微镜(TEM)。催化剂被发现强烈依赖于粒度分布、表面接触贵重金属的氧化态。其余的表面的影响硫酸盐,帮助再生催化剂实现更高的催化活性烟尘氧化。

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