The presence of a metal such as calcium or zinc in a lubricant appears to inhibit the poisoning effect of phosphorus on platinum oxidising catalysts. This is a general conclusion from rig, engine and vehicle tests on lubricants with different additive components. Among the test results reported a lubricant blend with 2.5% by weight ZDDP (0 22% wt Zn) and another blend with 1.25% wt ZDDP plus enough phosphorus containing ashless anti-oxidant to double the phosphorus content of the lubricant both gave satisfactory performance in tersm of catalyst degradation.
The Effect of Lubricant Additives on the Durability of Platinum Oxidising Catalysts*
Sae Technical Papers
1975 Automotive Engineering Congress and Exposition ; 1975
1975-02-01
Conference paper
English
The effect of lubricant additives on the durability of platinum oxidising catalysts.
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