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Silicon contamination of automotive catalysts

Conference ·
OSTI ID:5543013
; ; ; ;
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-
Country of Publication:
United States
Language:
English

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Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSTRACTS
AUTOMOTIVE FUELS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL ANALYSIS
CORROSIVE EFFECTS
CRISTOBALITE
DEACTIVATION
DOCUMENT TYPES
EFFICIENCY
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
EQUIPMENT
EXHAUST GASES
FLUIDS
FUELS
GASEOUS WASTES
GASES
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
IMPURITIES
INORGANIC ACIDS
LEADING ABSTRACT
MASS TRANSFER
MEASURING INSTRUMENTS
MEETINGS
METERS
MICROANALYSIS
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN METERS
PLUGGING
POLLUTION CONTROL EQUIPMENT
REGENERATION
SCALING
SCANNING ELECTRON MICROSCOPY
SILICON COMPOUNDS
SILICON OXIDES
SOUND WAVES
STOICHIOMETRY
SURFACE AREA
SURFACE PROPERTIES
THERMAL DEGRADATION
ULTRASONIC WAVES
VEHICLES
WASTES