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Catalytic exhaust control

Journal Article:

Abstract

Recent achievements and problems in the development of exhaust control devices in the USA are reviewed. To meet the 1976 emission standards, catalytic systems for the oxidation of carbon monoxide and hydrocarbons and for the reduction of nitrogen oxides to nitrogen and water are needed. While oxidizing catalysts using platinum, palladium, copper, vanadium, and chromium appplied on alumina or ceramic materials are more or less effective in emission control, there are no catalytic devices for the reduction of nitrogen oxides with the required useful life of 25,000 to 50,000 miles as yet available. In the case of platinum catalysts on monolithic supports, the operating temperature of 650 to 750/sup 0/C as required for the oxidation process may cause inactivation of the catalysts and fusion of the support material. The oxidation of CO and hydrocarbons is inhibited by high concentrations of CO, nitric oxide, and hydrocarbons. The use of catalytic converters requires the use of lead-free or low-lead gasoline. The nitrogen oxides conversion efficiency is considerably influenced by the oxygen-to-CO ratio of the exhaust gas, which makes limitation of this ratio necessary.
Authors:
Publication Date:
Sep 01, 1973
Product Type:
Journal Article
Reference Number:
EDB-77-093872
Resource Relation:
Journal Name: Quim. Ind. (Madrid); (Spain); Journal Volume: 19:9
Subject:
33 ADVANCED PROPULSION SYSTEMS; AUTOMOBILES; CATALYTIC CONVERTERS; REVIEWS; CARBON MONOXIDE; CATALYSTS; HYDROCARBONS; MATERIALS; NITROGEN OXIDES; OXIDATION; REDUCTION; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; DOCUMENT TYPES; EQUIPMENT; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL EQUIPMENT; VEHICLES; 330701* - Emission Control- Nitrogen Oxides; 330702 - Emission Control- Carbon Monoxide; 330704 - Emission Control- Hydrocarbons
OSTI ID:
7216989
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
Journal ID: CODEN: QUIBA
Submitting Site:
APA
Size:
Pages: 526-529
Announcement Date:
Jul 01, 1977

Journal Article:

Citation Formats

Heinemann, H. Catalytic exhaust control. Spain: N. p., 1973. Web.
Heinemann, H. Catalytic exhaust control. Spain.
Heinemann, H. 1973. "Catalytic exhaust control." Spain.
@misc{etde_7216989,
title = {Catalytic exhaust control}
author = {Heinemann, H}
abstractNote = {Recent achievements and problems in the development of exhaust control devices in the USA are reviewed. To meet the 1976 emission standards, catalytic systems for the oxidation of carbon monoxide and hydrocarbons and for the reduction of nitrogen oxides to nitrogen and water are needed. While oxidizing catalysts using platinum, palladium, copper, vanadium, and chromium appplied on alumina or ceramic materials are more or less effective in emission control, there are no catalytic devices for the reduction of nitrogen oxides with the required useful life of 25,000 to 50,000 miles as yet available. In the case of platinum catalysts on monolithic supports, the operating temperature of 650 to 750/sup 0/C as required for the oxidation process may cause inactivation of the catalysts and fusion of the support material. The oxidation of CO and hydrocarbons is inhibited by high concentrations of CO, nitric oxide, and hydrocarbons. The use of catalytic converters requires the use of lead-free or low-lead gasoline. The nitrogen oxides conversion efficiency is considerably influenced by the oxygen-to-CO ratio of the exhaust gas, which makes limitation of this ratio necessary.}
journal = {Quim. Ind. (Madrid); (Spain)}
volume = {19:9}
journal type = {AC}
place = {Spain}
year = {1973}
month = {Sep}
}