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Unregulated emissions from diesel engine with particulate filter using Fe-based fuel borne catalyst

Journal of Environmental Sciences 2014年第10期26卷 2027-2033页

作者： Hong Zhao Yunshan Ge Tiezhu Zhang Jipeng Zhang Jianwei Tan Hongxin Zhang College of Mechanical & Electronic Engineering Qingdao University National Lab of Auto Performance & Emission Test Beijing Institute of Technology

The alteration and formation of toxic compounds and potential changes in the toxicity of emissions when using after-treatment technologies have gained wide attention. Volatile organic compound（VOC）, carbonyl compound and particle-phase polycyclic aromatic hydrocarbon（PAH） emissions were tested at European Steady State Cycle（ESC） to study unregulated emissions from a diesel engine with a fuel-borne catalyst and diesel particulate filter（FBC–dpf）. An Fe-based fuel-borne catalyst was used for this study. According to the results, brake specific emissions of total vocs without and with dpf were 4.7 and4.9 mg/kWh, respectively, showing a 4.3% increase. Benzene and n-undecane emissions increased and toluene emission decreased, while other individual VOC emissions basically had no change. When retrofitted with the FBC–dpf, total carbonyl compound emission decreased 15.7%, from 25.8 to 21.8 mg/kWh. The two highest carbonyls, formaldehyde and acetaldehyde, were reduced from 20.0 and 3.7 to 16.5 and 3.3 mg/kWh respectively. The specific reactivity（SR） with dpf was reduced from 6.68 to 6.64 mg/kWh. Total particle-phase PAH emissions decreased 66.4% with dpf compared to that without dpf. However, the Benzo[a]pyrene equivalent（BaPeq） with dpf had increased from 0.016 to 0.030 mg/*** and Pyrene had the greatest decrease, 91.1% and 88.4% respectively. The increase of two- and three-ring pahs with dpf indicates that the fuel-borne catalyst caused some gas-phase pahs to adsorb on particles. The results of this study expand the knowledge of the effects of using a particulate filter and a Fe-based fuel-borne catalyst on diesel engine unregulated emissions.

关键词： fuel-borne catalyst dpf vocs carbonyl compounds particle-phase pahs

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