| abstract |
A catalyst having molybdenum (Mo) as an essential element, and the constituent elements in other catalytically active components satisfying the relationship represented by the following formula (cI). 0.44≤Σ{(MoIE-XIE)×XC}≤1.53 (cⅠ) [In formula (cI), XIE is the first ionization energy (eV) of each element other than molybdenum, MoIE is the first ionization energy (eV) of molybdenum, and XC is the atomic ratio of the element when molybdenum is 12 Is represented, and when (MoIE-XIE) is less than 0, it is set to 0 and used for calculation.] |