No major backsliding in air quality when replacing MTBE with isooctane in CARB gasoline

Johan Perander, Leena Rantanen, Juha Pentikäinen, Päivi Aakko, Anu Jäntti

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)


Plans to ban MTBE (Methyl tertiary-Butyl Ether) have led to discussions on how the gasoline in California will be formulated without any backsliding in air quality. One possibility is to replace MTBE with isooctane. Exhaust emissions using California Phase II gasoline with MTBE, were compared to a gasoline where MTBE had been replaced with isooctane. Regulated, particulate, carbon dioxide, and PAH (polyaromatic hydrocarbons) emissions were measured at 22 °C temperature for 8 vehicles using the European cycle for year 2000 (ECE+EUDC). One of the vehicles was a GDI (Gasoline Direct Injection), one was a carbureted model without a catalytic converter, and the others were equipped with multi point fuel injection and catalytic converters. Results indicate that no major backsliding in air quality can be expected when replacing MTBE with isooctane. NOx (nitrogen oxides) emissions were reduced in all vehicle types. CO emissions increased in the vehicle without a catalytic converter. Differences in fuel consumption and CO2-emissions were within the accuracy of the measurements. Consistent differences were not seen between the fuels concerning PAH emissions or particulate mutagenicity.

Original languageEnglish
Article number2001-01-3588
JournalSAE Technical Paper Series
Publication statusPublished - 1 Dec 2001
MoE publication typeA1 Journal article-refereed
EventInternational Fall Fuels and Lubricants Meeting and Exposition - Tulsa, OK, United States
Duration: 13 Oct 199716 Oct 1997


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