by SAE International in United States
Hydrocarbon and carbon monoxide oxidation catalysts having good catalytic activity, stability and improved physical durability were developed. Based on laboratory tests, these catalysts are predicted to be able to meet the Inter-Industry Emission Control Program HC and CO emission levels, and the durability goals, in vehicles in which HC, CO and NOx goals are achieved simultaneously. However, confirming vehicle tests must be made to validate these predictions.The development of these catalysts has been aided by a mathematical model of the catalytic converter, and by some unique experimental techniques. These tools have been used to guide the development, and to evaluate the catalytic activity, the chemical stability, and the physical durability of the catalysts in laboratory tests.These laboratory tests were complemented by several vehicle durability evaluations which have shown that although the IIEC goals were met initially, they were often exceeded after mileage accumulation. The principal causes for not meeting the goals have been catalyst loss due to inherently low catalyst attrition resistance and inter-particle abrasion caused by inadequate converter design. Improved converter designs and more…
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