DYNAMOMETER EVALUATION OF PLASMA-CATALYST FOR DIESEL NOX REDUCTION
DYNAMOMETER EVALUATION OF PLASMA-CATALYST FOR DIESEL NOX REDUCTION
复制标题
用于减少柴油机氮氧化物排放的等离子体催化剂的测功机评估
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
R. Tonkyn
中科院分区：
文献类型：
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作者：
J. Hoard;S. J. Schmieg;D. J. Brooks;C. Peden;S. Barlow;R. Tonkyn
研制了一种三级等离子体催化系统，并在发动机台架上进行了试验。先前的实验室测试表明可以获得高的NOx效率。在将己烯还原剂添加到排气中的情况下，观察到超过90%的NOx还原。然而，使用柴油或费托还原剂，催化剂效率迅速下降。在空气中加热催化剂可除去表面的棕色存款并恢复转化效率。在发动机试验之后，对所用催化剂进行评价。BET表面积下降，TPD显示显著的储存。这种储存似乎部分是未燃烧的柴油燃料，可以通过加热到250-300 ℃左右来去除，部分是与表面结合的碳氢化合物，直到450-500 ℃。丙烯还原剂的实验室测试表明，即使在操作温度不超过300 ℃时，催化剂也缓慢恢复效率。这表明控制策略可以通过偶尔适度加热来再生催化剂。
A three-stage plasma-catalyst system was developed and tested on an engine dynamometer. Previous laboratory testing suggested high NOx efficiency could be obtained. With hexene reductant added to the exhaust, over 90% NOx reduction was observed. However, with diesel or Fischer-Tropsch reductant the catalyst efficiency rapidly dropped off. Heating the catalyst in air removed brown deposit from the surface and restored conversion efficiency. Following the engine tests, the used catalysts were evaluated. BET surface area decreased, and TPD revealed significant storage. This storage appears to be partly unburned diesel fuel that can be removed by heating to around 250-300 C, and partly hydrocarbons bonded to the surface that remain in place until 450-500 C. Laboratory testing with propene reductant demonstrated that the catalyst regains efficiency slowly even when operating temperature does not exceed 300 C. This suggests that control strategies may be able to regenerate the catalyst by occasional moderate heating.