Evaluation of the Impacts of Biodiesel and Second Generation Biofuels on NOx Emissions for CARB Diesel Fuels

详细信息    查看全文

• 作者：Maryam Hajbabaei ; Kent C. Johnson ; Robert A. Okamoto ; Alexander Mitchell ; Marcie Pullman ; Thomas D. Durbin
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：August 21, 2012
• 年：2012
• 卷：46
• 期：16
• 页码：9163-9173
• 全文大小：419K
• 年卷期：v.46,no.16(August 21, 2012)
• ISSN：1520-5851

文摘

The impact of biodiesel and second generation biofuels on nitrogen oxides (NO_x) emissions from heavy-duty engines was investigated using a California Air Resources Board (CARB) certified diesel fuel. Two heavy-duty engines, a 2006 engine with no exhaust aftertreatment, and a 2007 engine with a diesel particle filter (DPF), were tested on an engine dynamometer over four different test cycles. Emissions from soy- and animal-based biodiesels, a hydrotreated renewable diesel, and a gas to liquid (GTL) fuel were evaluated at blend levels from 5 to 100%. NO_x emissions consistently increased with increasing biodiesel blend level, while increasing renewable diesel and GTL blends showed NO_x emissions reductions with blend level. NO_x increases ranged from 1.5% to 6.9% for B20, 6.4% to 18.2% for B50, and 14.1% to 47.1% for B100. The soy-biodiesel showed higher NO_x emissions increases compared to the animal-biodiesel. NO_x emissions neutrality with the CARB diesel was achieved by blending GTL or renewable diesel fuels with various levels of biodiesel or by using di-tert-butyl peroxide (DTBP). It appears that the impact of biodiesel on NO_x emissions might be a more important consideration when blended with CARB diesel or similar fuels, and that some form of NO_x mitigation might be needed for biodiesel blends with such fuels.