No Major Backsliding in Air Quality when Replacing MTBE with Isooctane in CARB Gasoline

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

doi:10.4271/2001-01-3588

2001-09-24

No Major Backsliding in Air Quality when Replacing MTBE with Isooctane in CARB Gasoline 2001-01-3588

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.

NO_x (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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Digital $37.00 Print $37.00

Preview Document

We also recommend:

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

No Major Backsliding in Air Quality when Replacing MTBE with Isooctane in CARB Gasoline 2001-01-3588

SAE MOBILUS