The Influence of Sulfur Species on the Laboratory Performance of Automotive Three Component Control Catalysts

George C. Joy; George R. Lester; Frank S. Molinaro

doi:10.4271/790943

1979-02-01

The Influence of Sulfur Species on the Laboratory Performance of Automotive Three Component Control Catalysts 790943

In order to meet the emission standards of 1980 and 1981, catalysts which can simultaneously reduce hydrocarbon, carbon monoxide and nitric oxide emissions will come into wide usage. Just as important will be fuel management systems that maintain tight control of the air/fuel ratio. Since the 1981 standards will be quite stringent, the effects of poisons such as lead, phosphorus and sulfur on the catalyst will be very important.

A study was conducted to determine the effects of different amounts of sulfur dioxide on the activity of a Pt, a Rh catalyst and a fully formulated three component control catalyst.

These catalysts were tested in the laboratory employing a synthetic exhaust, that which simulates real automotive exhaust. The catalysts were tested under various conditions that would be encountered during normal closed-loop operation. SO₂ affects the catalysts differently under each of the above conditions. Under dynamic conditions the SO₂ has very little effect on the catalytic activity, but some influence on oxygen storage, whereas the catalyst activity is extremely inhibited under fuel-rich and non-oxidizing conditions. These results correlate with those in the literature.

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

The Influence of Sulfur Species on the Laboratory Performance of Automotive Three Component Control Catalysts 790943

SAE MOBILUS