Catalyst Deterioration Assessment DCL carefully considers all mechanisms involved in catalyst deterioration, to ensure the long-term performance of target emissions. DCL maintains a large database of model gas, test cell, and in-field catalyst aging data. | 
Post catalyst emissions over 6000 hours of operation | | Ideal Surface
| - Good Ahesion
- Well-Dispersed Particles
- Similar Thermal Expansion Coefficients of Substrate and Washcoat
| | Chemical Deterioration
| - Poisoning; irreversible adsorption or reaction on/with the surface
- Inhibition; competitive reversible
- adsorption of the poison precursors
|  Sulphur poisoning (reversible, greater than 600oC / 1110oF caused by ZDDP (zinc dialkyl dithio phosphate)
Lube oil poisoning - Phosphorus poisoning (irreversible)
| Thermal Deterioration
| - Sintering (re-dispersion)
- Alloying
- Support changes
- Noble metal-base metal interactions
|  High temperature sintering 
Complete collapse of washcoat
Loss of surface area from 200m2/g to 5m2/g at 1200oC/2200oF | Fouling | - Carbonaceous deposits (coking)
|  Soot and ash deposits, reversible by catalyst washing/cleaning | Mechanical Deterioration
| - Thermal shock
- Attrition/erosion
- Physical breakage
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