Silicon contamination of automotive catalysts
On occasions automotive fuels have been contaminated by adventitious admixtures of silicon (Si)-containing compounds which have deleterious effects on automotive catalysts and oxygen sensors. The deactivation of monolithic automotive catalysts by fuel-derived silicon is due to deposition of crystalline silica (..cap alpha..-SiO/sub 2/) on the catalyst surface which causes mass transfer limitations and may ultimately result in plugging of the monolith. Stoichiometric conversions efficiency of three-way catalysts (TWCs) from various low-mileage vehicles were significantly deteriorated; e.g., from typical three-way efficiencies of approx. =95% conversion to <50% conversion at 550/sup 0/C after only 1500 mi of vehicle use. Laboratory aging of a TWC exposed to combustion products of isooctane fuel containing 20 ppm Si resulted in a continual decline in three-way conversions to <40% after 15,000 simulated miles. Catalyst activity of the contaminated sample was recovered entirely by washing with hydrofluoric acid and substantially by an ultrasonic treatment in soapy water.
- Research Organization:
- Ford Motor Co., Dearborn, MI
- OSTI ID:
- 5543013
- Report Number(s):
- CONF-860263-
- Resource Relation:
- Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 24 Feb 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CATALYTIC CONVERTERS
DEACTIVATION
EFFICIENCY
PLUGGING
REGENERATION
THERMAL DEGRADATION
SILICON COMPOUNDS
CORROSIVE EFFECTS
VEHICLES
AUTOMOTIVE FUELS
CRISTOBALITE
ELECTRON MICROPROBE ANALYSIS
EXHAUST GASES
HYDROFLUORIC ACID
IMPURITIES
LEADING ABSTRACT
MASS TRANSFER
MEETINGS
OXYGEN METERS
SCALING
SCANNING ELECTRON MICROSCOPY
STOICHIOMETRY
SURFACE AREA
ULTRASONIC WAVES
ABSTRACTS
CHALCOGENIDES
CHEMICAL ANALYSIS
DOCUMENT TYPES
ELECTRON MICROSCOPY
EQUIPMENT
FLUIDS
FUELS
GASEOUS WASTES
GASES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MEASURING INSTRUMENTS
METERS
MICROANALYSIS
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
SILICON OXIDES
SOUND WAVES
SURFACE PROPERTIES
WASTES
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Atmospheric- Chemicals Monitoring & Transport- (-1989)