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Hydrogen Cyanide Emissions from Three-Way Catalyst Prototypes under Malfunctioning Conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 1, 1978 by SAE International in United States
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Measurements have been made of the emissions from a prototype three-way catalyst automobile, during normal and simulated malfunction driving conditions. Four ceramic-supported catalyst compositions were investigated, ranging from Rh through two mixtures of Rh-Pt to Pt. Driving conditions included cyclic and cruise modes. Under normal operating conditions no HCN was detected. Under rich malfunction conditions, HCN was generally observed, even in the absence of a catalyst. In some cases, catalysts appeared to remove HCN from the exhaust gas; in others they increased its level. The highest emission rate for HCN was observed for the Rh catalyst, about 40 mg/km at 64 kph cruise.
CitationKeirns, M. and Holt, E., "Hydrogen Cyanide Emissions from Three-Way Catalyst Prototypes under Malfunctioning Conditions," SAE Technical Paper 780201, 1978, https://doi.org/10.4271/780201.
- Voorhoeve, R. J. H., et al., “Hydrogen Cyanide Production During Reduction of Nitric Oxide Over Platinum Catalysts,” Science, 190, 149, October 10, 1975.
- Bradow, R. L., and Stump, F. D., “Unregulated Emissions From Three-Way Catalyst Cars,” SAE Paper 770369, March, 1977.
- Ashmead, D. R., et al., “Nitrogen Oxide Removal Catalysts for Purification of Automobile Exhaust Gases,” SAE Paper 740249, February, 1974.
- Keirns, M. H., and Holt, E. L., “Hydrogen Cyanide Emissions From Three-Way Catalyst Prototypes Under Malfunctioning Conditions, EPA Report 460/3-77-023.
- Griffith, M. G., et al., “Assessment of Automotive Sulfate Emission Control Technology,” EPA Report 460/3-77-008, June, 1977.