| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas purification catalyst for NOx selective reduction enhancing selective catalyst reduction (SCR) activity by improving adsorptivity of NOx under low temperature such as engine start up timing and an exhaust gas purifying method using the catalyst.SOLUTION: The exhaust gas purification catalyst for NOx selective reduction contains a spinel type composite oxide represented by the formula MnFeO.SELECTED DRAWING: Figure 1 |
