Table 4
FACTORS WHICH INFLUENCE SULFUR INHIBITION OF CATALYTIC EMISSION CONTROL SYSTEMS
1. Catalyst Composition
• Precious metals used - palladium (Pd), Pd and rhodium (Rh),
platinum (Pt) and Rh, or Pt/PD/Rh
• Precious metal concentrations
• Base metal concentrations
• Catalyst volume
• Oxygen storage (i.e., cerium oxide or other compounds)
2. Catalyst design
3. Catalyst location
4. Emission control system – type and control of fuel metering
5. Engine calibration
6. V ehicle use
7. Fuel
8. Regeneration/recovery conditions