| 摘要 |
The present invention provides a method of producing an oxidation catalyst for cleaning exhaust gas, capable of achieving an excellent catalytic activity at a lower temperature for particulates and high boiling point hydrocarbons in exhaust gas from internal-combustion engines. A primary firing is performed after mixing nitrate of a first metal element Ln, manganese nitrate, and oxide of a third metal element A. A resultant material from the primary firing is subjected to grinding and then a secondary firing is performed at the range of 600 to 1200° C. for 1 to 5 hours. By doing so, a catalyst comprising a composite metal oxide represented by the general formula LnyMn1-xAxO3 is obtained.
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