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Sci Rep:瑞士学者报道汽油车排放量可能高于改造后的柴油车

摘要 : 根据《科学报告》近日发表的一项研究的实验室初始测试数据,汽油车产生的碳颗粒物(PM)排放量比加装了黑烟过滤器(DPF)和催化剂的柴油车多。

 根据《科学报告》近日发表的一项研究的实验室初始测试数据,汽油车产生的碳颗粒物(PM)排放量比加装了黑烟过滤器(DPF)和催化剂的柴油车多。作者指出由于车辆尾气对取样位置、车龄和环境温度敏感,因此有必要开展进一步的研究,计算整体废气排放情况。

碳颗粒物由碳黑、一次有机气溶胶(包括燃烧产生的固体颗粒物)和二次有机气溶胶(由燃烧时释放的有机化合物的大气老化产生)组成,是车辆尾气中的有毒成分。但是,加装了DPF的柴油车以及汽油车占这些尾气排放的比重一直没有得到量化。

瑞士菲利根保罗谢尔研究所的André Prévôt及同事通过实验室研究,量化了11辆汽油车和6辆加装了DPF的柴油车分别在22°C和-7°C时所排放的碳颗粒物。结果发现在22°C的条件下,汽油车的碳气溶胶平均排放量比柴油车高10倍,而在-7°C的条件下,前者比后者高62倍。研究人员还发现,测试的柴油车没有产生可检测到的二次有机气溶胶。

作者指出,没有加装DPF的柴油车的颗粒物排放量远远高于测试用车,在一定时间内,它们占颗粒物排放总量的比重将是最大的。

原文链接:

Gasoline cars produce more carbonaceous particulate matter than modern filter-equipped diesel cars

原文摘要:

Carbonaceous particulate matter (PM), comprising black carbon (BC), primary organic aerosol (POA) and secondary organic aerosol (SOA, from atmospheric aging of precursors), is a highly toxic vehicle exhaust component. Therefore, understanding vehicle pollution requires knowledge of both primary emissions, and how these emissions age in the atmosphere. We provide a systematic examination of carbonaceous PM emissions and parameterisation of SOA formation from modern diesel and gasoline cars at different temperatures (22, −7 °C) during controlled laboratory experiments. Carbonaceous PM emission and SOA formation is markedly higher from gasoline than diesel particle filter (DPF) and catalyst-equipped diesel cars, more so at −7 °C, contrasting with nitrogen oxides (NOX). Higher SOA formation from gasoline cars and primary emission reductions for diesels implies gasoline cars will increasingly dominate vehicular total carbonaceous PM, though older non-DPF-equipped diesels will continue to dominate the primary fraction for some time. Supported by state-of-the-art source apportionment of ambient fossil fuel derived PM, our results show that whether gasoline or diesel cars are more polluting depends on the pollutant in question, i.e. that diesel cars are not necessarily worse polluters than gasoline cars.

来源: Scientific Reports 浏览次数:0

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