Method of purifying exhaust gas from internal combustion engine

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United States of America Patent

PATENT NO 5997830
SERIAL NO

08874484

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Abstract

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This method comprises bringing exhaust gas from an internal combustion engine, which is operated at a fuel-lean air/fuel ratio, in contact with an iridium-containing catalyst in a first zone and then in contact with a platinum-containing catalyst in a second zone situated downstream of the first zone. This method is effective for exhaust gas from lean burn engines over a wide temperature range of 200 to 500.degree. C., produces less N.sub.2 O in a low-temperature range of 200 to 300.degree. C., and can purify exhaust gas stably and effectively even at a high temperature of 700.degree. C. or over.

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Patent Owner(s)

Patent OwnerAddress
N E CHEMCAT CORPORATION4-1 HAMAMATSU-CHO 2-CHOME MINATO-KU TOKYO 105-6124

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Itoh, Takashi Ichikawa, JP 124 1561
Kosaki, Yukio Ichikawa, JP 7 93
Shiokawa, Kazuhiko Kamagaya, JP 2 23

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  • 19 Citation Count
  • B01D Class
  • 54.90 % this patent is cited more than
  • 26 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges405312651084717163324401 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 9091 - 100100 +0255075100125150175200225250275300325350375400425450475500525550575

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