Catalysts employing the particles as a support and having catalytic agents distributed at controlled depths in the particle have excellent initial and sustained activity and {HEAD ~ durability}, especially for eliminating pollutants in {TAIL ~ automotive exhaust streams} 
Catalysts employing the particles as a support and having catalytic agents distributed at controlled depths in the particle have excellent initial and sustained activity and { HEAD ~ durability } , especially for eliminating pollutants in { TAIL ~ automotive exhaust streams }
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