The impact of sulphur storage on emissions from three-way catalysts

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5138725

Diwell, A F; Hallett, C; Taylor, J R

The relationship between H/sub 2/S emissions from three-way catalysts and the storage of sulphur on the catalyst surface has been investigated. Thermodynamic data predict that sulphur storage primarily will occur on Al/sub 2/O/sub 3/ and CeO/sub 2/ under lean and stoichiometric conditions, at up to 500/sup 0/C. Rich transients could then induce the decomposition of the Ce-S-O and Al-S-O compounds, releasing sulphur into the gas phase. Experimental studies have supported this model. A mechanism has been proposed for the subsequent formation of H/sub 2/S. The mechanism by which catalyst poisons attenuate H/sub 2/S emissions from engine-aged catalysts also has been studied. The effect has been shown to be related to decreased storage of sulphur, caused by stable catalyst-poison species at the catalyst surface.

• OSTI ID: 5138725
• Report Number(s): CONF-871142-
• Resource Relation: Conference: International fuels and lubricants meeting and exposition, Toronto, Canada, 2 Nov 1987; Other Information: Technical Paper 872163
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
HYDROGEN SULFIDES
AIR POLLUTION CONTROL
INTERNAL COMBUSTION ENGINES
CATALYSTS
EMISSION
ALUMINIUM OXIDES
CERIUM OXIDES
CHEMICAL REACTION KINETICS
EXHAUST SYSTEMS
HIGH TEMPERATURE
POLLUTION CONTROL EQUIPMENT
SULFUR
THERMAL DEGRADATION
THERMODYNAMICS
ALUMINIUM COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
CONTROL
ELEMENTS
ENGINES
EQUIPMENT
HEAT ENGINES
HYDROGEN COMPOUNDS
KINETICS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
RARE EARTH COMPOUNDS
REACTION KINETICS
SULFIDES
SULFUR COMPOUNDS
330100* - Internal Combustion Engines
330700 - Advanced Propulsion Systems- Emission Control
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)