La2Cu(1-x)FexO4氧化去除柴油机碳烟微粒的试验分析

摘要

Prepared series of La2AxB1-XO4 catalysts and soot particles were mixed, then were placed in fixed-bed continuous flow reaction system to do simulation tests to evaluate catalytic activities. It was found that La2Cuo.9Feo.1O4 showed better PM oxidation characteristic, which was consistent with the H2-TPR experiment results. TG-DTA tests also indicated solid reliability of the experiment results. Temperature-programmed tests were taken on cordierite and SiC catalytic substrate respectively. The results suggested that soot particles on the two kinds of substrate showed similar oxidation characteristics in temperature window 200-350°C. Engine bench tests also validated that La2Cuo.9Feo.1O4 could oxidize diesel emission soot particles efficiently. Computational model was established to simulate DPF soot loading and regeneration. The model was verified by engine bench test results, which suggested that the model was able to describe diesel soot particles oxidation process precisely.%制备的La2Cu(1-x)FexO4(x=0、0.1、0.2、0.3)系列催化剂与碳烟微粒紧密接触后,置于固定床连续流动反应系统,进行氧化碳烟活性评价的模拟试验,研究发现La2Cu0.9Fe0.1O4具有较好将其氧化的反应活性,这与H2-TPR试验结论相一致,且由TG-DTA试验表明模拟试验测试的数据具有可靠性.在堇青石和SiC载体上涂敷催化剂后进行程序升温试验,表明在200℃～350℃温度区间内2种材料载体对氧化碳烟微粒的活性相近.通过发动机台架试验验证了La2Cu0.9Fe0.1O4能有效氧化柴油机排放的碳烟微粒,且对工作过程进行了模拟计算,计算结果与试验结果具有一致性,表明通过数学模型能较好地描述催化氧化柴油机排放的碳烟微粒.