| DOI: | 10.2172/1038341
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| 报告号: | NREL/FS-5400-52010
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| 报告题名: | Study Pinpoints Sources of Polluting Vehicle Emissions (Fact Sheet) |
| 作者: | Not Available
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| 出版年: | 2012
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| 发表日期: | 2012-03-01
|
| 总页数: | 1
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | NREL HIGHLIGHT
; VEHICLES
; EMISSIONS
; Transportation
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| 中文主题词: | 碳
; 颗粒物质
; 排放物
; 交通设施
; 有机碳
; 颗粒物
; 天然气
|
| 主题词: | CARBON
; PARTICULATE MATTER
; EMISSIONS
; TRANSPORTATION
; ORGANIC CARBON
; NATURAL GAS
|
| 英文摘要: | Unburned lubricant produces 60%-90% of organic carbon emissions. While diesel fuel is often viewed as the most polluting of conventional petroleum-based fuels, emissions from gasoline engines can more significantly degrade air quality. Gasoline exhaust is at least as toxic on a per-unit-mass basis as diesel exhaust, and contributes up to 10 times more particulate matter (PM) to the emission inventory. Because emissions from both fuels can gravely impact health and the environment, researchers at the National Renewable Energy Laboratory (NREL) launched a study to understand how these pollutants relate to fuels, lubricants, and engine operating conditions. NREL's Collaborative Lubricating Oil Study on Emissions (CLOSE) project tested a variety of vehicles over different drive cycles at moderate (72 F) and cold (20 F) temperatures. Testing included: (1) Normal and high-emitting light-, medium-, and heavy-duty vehicles; (2) Gasoline, diesel, and compressed natural gas (CNG)-powered vehicles; (3) New and aged lubricants representative of those currently on the market; and (4) Gasoline containing no ethanol, E10, Texas-mandated low-emission diesel fuel, biodiesel, and CNG. The study confirmed that normally functioning emission control systems for gasoline light-duty vehicles are very effective at controlling organic carbon (OC) emissions. Diesel vehicles without aftertreatment emission control systems exhibited OC emissions approximately one order of magnitude higher than gasoline vehicles. High-emitter gasoline vehicles produced OC emissions similar to diesel vehicles without exhaust aftertreatment emission control. Exhaust catalysts combusted or converted more than 75% of lubricating oil components in the exhaust gases. Unburned crankcase lubricant made up 60%-90% of OC emissions. This OC represented 20%-50% of emitted PM in all but two of the vehicles. Three-way catalysts proved effective at reducing most of the OC. With high PM emitters or vehicles with deteriorated aftertreatment, high-molecular-weight fuel components and unburned lubricant were emitted at higher rates than in vehicles in good repair, with functioning emissions systems. Light-duty gasoline, medium-duty diesel, and heavy-duty natural gas vehicles produced more particles with fresh oil than with aged oil. The opposite trend was observed in light- and medium-duty high PM emitters. This effect was not readily apparent with heavy-duty diesel vehicles, perhaps because the lubricant represented a much smaller fraction of the total PM in those trucks. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1038341
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40730
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| File Name/ File Size |
Content Type |
Version |
Access |
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| 1038341.pdf（316KB） | 研究报告 | -- | 开放获取 | | View
Download
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| Recommended Citation: | |
Not Available. Study Pinpoints Sources of Polluting Vehicle Emissions (Fact Sheet). 2012-01-01.
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