Effects of Catalyst Formulation on Vehicle Emissions With Respect to Gasoline Fuel Sulfur Level

Gordon Bartley; Bruce Bykowski; Steve Welstand; David Lax

doi:10.4271/1999-01-3675

1999-10-25

Effects of Catalyst Formulation on Vehicle Emissions With Respect to Gasoline Fuel Sulfur Level 1999-01-3675

Proposed emissions standards will require that emissions control systems function at extremely high efficiency. Recently, studies have shown that elevated gasoline fuel sulfur levels (GFSL) can impair catalytic converter efficiency. In this study, a variety of tri-metal catalysts were evaluated to determine if formulation changes could reduce emissions sensitivity to GFSL. Catalysts with elemental composition similar to an OEM, but with double the precious metal (PM) loading, were evaluated using 38 and 620 ppm GFSL. Doubling the PM loading significantly reduced catalyst sensitivity to sulfur. Doubling the rhodium loading, at the expense of the platinum loading, significantly improved NO_x emission sulfur sensitivity.

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Effects of Catalyst Formulation on Vehicle Emissions With Respect to Gasoline Fuel Sulfur Level 1999-01-3675

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