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Title: Effect of high temperatures on three-way automotive catalysts

Abstract

The thermal deactivation of current automotive three-way catalysts (TWCs) was studied under various high temperature conditions to determine which were most damaging. The catalysts were aged on an engine dynamometer simulating the U.S. emission durability cycle with additional periodic exposure to high temperatures. The deactivation was measured as a function of the duration, temperature and air-fuel ratio during the high temperature exposure. With lean air-fuel ratios during the high temperature exposure, TWC performance as measured at 600/sup 0/F was most susceptible to deactivation showing appreciable loss of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) conversions after 20 minutes of aging at 1600/sup 0/F. The TWC performance as measured at 800/sup 0/F had comparable loss only after 60 minutes of aging at 2200/sup 0/F. With rich air-fuel ratios the TWC performance remained nearly unaffected by aging up to 2000/sup 0/F. The results are explained in terms of the loss of active metal surface area and the rates of the various reactions involved in TWC operation.

Authors:
;
Publication Date:
OSTI Identifier:
5603689
Report Number(s):
SAE-TP-840850
Resource Type:
Book
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 54 ENVIRONMENTAL SCIENCES; CARBON MONOXIDE; AIR POLLUTION MONITORING; CATALYTIC CONVERTERS; DEACTIVATION; TEMPERATURE EFFECTS; HYDROCARBONS; NITROGEN OXIDES; VEHICLES; AGING; CATALYSTS; CHEMICAL REACTION KINETICS; COMPARATIVE EVALUATIONS; DYNAMOMETERS; EXHAUST GASES; FUEL-AIR RATIO; HIGH TEMPERATURE; METALS; SERVICE LIFE; SIMULATION; SURFACE AREA; VERY HIGH TEMPERATURE; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELEMENTS; EQUIPMENT; FLUIDS; GASEOUS WASTES; GASES; KINETICS; MEASURING INSTRUMENTS; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL EQUIPMENT; REACTION KINETICS; SURFACE PROPERTIES; WASTES; 330100* - Internal Combustion Engines; 500200 - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Hammerie, R H, and Wu, C L. Effect of high temperatures on three-way automotive catalysts. United States: N. p., 1984. Web.
Hammerie, R H, & Wu, C L. Effect of high temperatures on three-way automotive catalysts. United States.
Hammerie, R H, and Wu, C L. 1984. "Effect of high temperatures on three-way automotive catalysts". United States.
@article{osti_5603689,
title = {Effect of high temperatures on three-way automotive catalysts},
author = {Hammerie, R H and Wu, C L},
abstractNote = {The thermal deactivation of current automotive three-way catalysts (TWCs) was studied under various high temperature conditions to determine which were most damaging. The catalysts were aged on an engine dynamometer simulating the U.S. emission durability cycle with additional periodic exposure to high temperatures. The deactivation was measured as a function of the duration, temperature and air-fuel ratio during the high temperature exposure. With lean air-fuel ratios during the high temperature exposure, TWC performance as measured at 600/sup 0/F was most susceptible to deactivation showing appreciable loss of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) conversions after 20 minutes of aging at 1600/sup 0/F. The TWC performance as measured at 800/sup 0/F had comparable loss only after 60 minutes of aging at 2200/sup 0/F. With rich air-fuel ratios the TWC performance remained nearly unaffected by aging up to 2000/sup 0/F. The results are explained in terms of the loss of active metal surface area and the rates of the various reactions involved in TWC operation.},
doi = {},
url = {https://www.osti.gov/biblio/5603689}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}

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