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首页> 外文期刊>Environmental engineering and management journal >EMISSION FACTORS FOR LIGHT-DUTY VEHICLES EQUIPPED WITH THREE-WAY CATALYTIC CONVERTER BASED ON MICRO-REACTOR STUDIES: A PROPOSAL FOR AMMONIA, NITROUS OXIDE AND MOLECULAR HYDROGEN
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EMISSION FACTORS FOR LIGHT-DUTY VEHICLES EQUIPPED WITH THREE-WAY CATALYTIC CONVERTER BASED ON MICRO-REACTOR STUDIES: A PROPOSAL FOR AMMONIA, NITROUS OXIDE AND MOLECULAR HYDROGEN

机译：基于微反应器研究的配备三元催化转化器的轻型汽车的排放因子：关于氨，一氧化二氮和分子氢的建议

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In this work, we report a methodology to provide emission factors based on micro-reactor studies. We propose emission factors for ammonia (NH_3,158 mg/km), nitrous oxide (N_2O, 322 mg/km) and molecular hydrogen (H_2, 72 mg/km) for vehicles equipped with three-way catalytic converter (TWC). Our experimental conditions were similar to those prevailing on vehicles during catalyst light-off and transient urban driving cycle. NH_3 and H_2 emission factors reported in this work are quantitatively similar to those reported from vehicles. However, for N_2O our results are almost 6 times higher than the average reported from vehicles during catalyst light-off. It is possible that the emission factor of N_2O from light-duty vehicles reported during catalyst light-off is underestimated because the time (8.4 min) for recollecting the N_2O emission contained in the exhaust gases is largest than the time (4 min) required to produce the main emission of N_2O on the three way catalyst. The methodology represents one of the first attempts to predict emission factors from a micro-reactor. Besides, our proposal has the advantage that the main parameters involved in the formation of NH_3, N_2O and H_2 can be controlled. Our method also complements the experimental strategies to estimate emissions, which are difficult to observe during the measurements of these compounds on vehicles.
机译：在这项工作中，我们报告了一种基于微反应器研究提供排放因子的方法。我们提出了配备三元催化转化器（TWC）的车辆的氨（NH_3,158 mg / km），一氧化二氮（N_2O，322 mg / km）和分子氢（H_2，72 mg / km）的排放因子。我们的实验条件类似于在催化剂起燃和瞬态城市驾驶周期中车辆所处的条件。在这项工作中报告的NH_3和H_2排放因子在数量上与车辆报告的相似。但是，对于N_2O，我们的结果几乎是催化剂起燃期间车辆报告的平均值的6倍。催化剂点火期间报告的轻型车辆N_2O的排放因子可能被低估了，因为重新收集废气中N_2O排放物的时间（8.4分钟）大于回收废气中N_2O排放所需要的时间（4分钟）。在三元催化剂上产生N_2O的主要排放。该方法学是预测微反应器排放因子的首批尝试之一。此外，我们的建议的优点是可以控制形成NH_3，N_2O和H_2的主要参数。我们的方法还补充了估算排放的实验策略，在车辆上对这些化合物进行测量时很难观察到这些排放。

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