Organic acids emissions from natural-gas-fed engines

E Zervas , Mohand Tazerout (1, 2)

1 Mines Nantes - Mines Nantes
2 GEPEA - Laboratoire de génie des procédés - environnement - agroalimentaire

A natural-gas-fed spark-ignition engine, operating under lean conditions, is used for the study of the organic acids exhaust emissions. These pollutants are collected by passing a sample of exhaust gas into deionised water. The final solution is directly analysed by HPLC/UV at 204 nm. Only formic acid is emitted in detectable concentration under the experimental conditions used. Its concentration decreases with the three engine operating parameters studied. spark advance, volumetric efficiency and fuel/air equivalence ratio. Exhaust formic acid concentration is also linked with exhaust oxygen concentration and exhaust temperature. A comparison with other engines (SI engines fed with gasoline and compression ignition engines) from bibliographic data proves that natural-gas-fed engines emit less organic acids than the other two types of engines. (C) 2000 Elsevier Science Ltd. All rights reserved.

Domaines: Sciences de l'ingénieur [physics]

E Zervas, Mohand Tazerout. Organic acids emissions from natural-gas-fed engines. Atmospheric environment, 2000, 34 (23), pp.3921-3929. ⟨10.1016/S1352-2310(00)00160-6⟩. ⟨hal-00935954⟩