Effects of different regeneration timing protocols on the performance of a model NOX storage/reduction catalyst
Effects of different regeneration timing protocols on the performance of a model NOX storage/reduction catalyst
复制标题
不同再生定时方案对模型 NOX 存储/还原催化剂性能的影响
DOI：
10.1016/j.cattod.2009.12.004
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发表时间：
2010
期刊：
影响因子：
5.3
通讯作者：
W. Epling
中科院分区：
文献类型：
--
作者：
M. Al‐Harbi;W. Epling
不同的再生时间的影响，但与一个恒定的还原剂的总量交付，研究了模型NOx存储和还原（NSR）催化剂。再生时间分别为4、8和16 s，还原剂用量分别为4、2和1%H2。贫燃时间在这些实验期间保持相同，导致循环中的恒定的入口NOx-还原剂量。总体而言，结果显示，在除500°C以外的所有温度下，随着再生时间的延长，NOx捕获和总体还原性能都有明显改善。在500°C下，随着再生时间的延长，捕集性能仍然有所增加，但是随着再生时间的增加，NOx释放的增加更显著，同时捕集性能的小幅增加导致NOx转化率总体下降。实验结果表明，不同的H2浓度并没有导致不同的再生程度，而影响再生效果的主要因素是再生时间本身。随着再生时间的延长，发生更多的硝酸盐/亚硝酸盐分解，从而导致更广泛的表面清洁。
The effects of different regeneration times, but with a constant total amount of reductant delivered, were investigated over a model NOXstorage and reduction (NSR) catalyst. The different regeneration times were 4, 8 and 16s with 4, 2, and 1% H2as the reductant amounts, respectively. The lean time was kept the same during these experiments, resulting in a constant inlet NOX-to-reductant amount in the cycles. Overall, the results show clear improvements with longer regeneration times in both NOXtrapping and overall reduction performance at all temperatures except 500°C. At 500°C, there was still an increase in trapping performance with longer regeneration time, but a more significant increased NOXrelease coincident with a small increase in the trapping performance resulted in an overall decrease in NOXconversion with increasing regeneration time. The data demonstrate that the different concentrations of H2did not lead to different regeneration extents, but that the main factor for the improved performance was the regeneration time itself. With longer regeneration times, more nitrate/nitrite decomposition occurred, thereby leading to more extensive surface cleaning.