| abstract |
(57) Abstract: Provided is a method for improving the turnover number of an oxidation reaction catalyst containing a metal element belonging to Group VA, VIA, VIIA or VIII of the Periodic Table. SOLUTION: An ultrafine particle of at least one kind of metal element for activation selected from Group IB elements of the periodic table is converted into a periodic table V It is characterized by being dispersed and contained in an oxidation reaction catalyst containing a Group A, VIA, VIIA or VIII metal element. |