1983-02-01

Lead-Tolerant Catalysts for Europe: The Behavior of Precious Metals on Alumina Pellets When Used with 0.15 or 0.40 g/l Lead in Gasoline 830269

It may be necessary to have recourse to catalysts in Europe to reduce automotive emissions if future legislation imposes very strict limits. Since it is not desirable to forbid the use of lead-base additives in gasoline, such catalysts must be able to withstand lead poisoning.An analysis of poisoning shows that some catalysts resist this form of deactivation better than others and that the same catalyst ages more or less quickly depending on the conditions under which it is used.Improved endurance performances can be obtained by optimizing the active phase of catalysts and their supports, as well as by implementing them at high temperatures. With gasoline containing 0.15 g/l of lead and after 40 000 km of effective running, 80% CO oxidation and 65% unburned-hydrocarbon oxidation were obtained. With 0.4 g/1 of lead, plugging occurs more quickly, and the reaction of lead deposits with the support at high temperatures tends to degrade the mechanical properties of catalysts.

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