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Title: Silicon contamination of automotive catalysts

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Ford Motor Co., Dearborn, MI
OSTI Identifier:
5543013
Report Number(s):
CONF-860263-
Resource Type:
Conference
Resource Relation:
Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 24 Feb 1986
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 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; 330700* - Advanced Propulsion Systems- Emission Control; 500200 - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Gandhi, H S, Williamson, W B, Goss, R L, Marcotty, L A, and Lewis, D. Silicon contamination of automotive catalysts. United States: N. p., 1986. Web.
Gandhi, H S, Williamson, W B, Goss, R L, Marcotty, L A, & Lewis, D. Silicon contamination of automotive catalysts. United States.
Gandhi, H S, Williamson, W B, Goss, R L, Marcotty, L A, and Lewis, D. Wed . "Silicon contamination of automotive catalysts". United States.
@article{osti_5543013,
title = {Silicon contamination of automotive catalysts},
author = {Gandhi, H S and Williamson, W B and Goss, R L and Marcotty, L A and Lewis, D},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Conference:
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