PREPARATION OF OXIDIZING CATALYST

摘要

PURPOSE:To obtain a catalyst having high activity and high stability, in a method for preparing a phosphorus/molybdenum/alkali type oxidizing catalyst, by mixing an inactivated catalyst and a stock material containing a desired component in water and subsequently adjusting an ammonium radical and a nitrate radical to a specific range. CONSTITUTION:As the stock compound used in the preparation of a catalyst, nitrate of each element, ammonium salt thereof, halide thereof and phosphomolybdenic acid and a salt thereof can be used in combination. In this case, the ammonium radical and nitrate radical contained in the stock material are adjusted so as to be respectively 7-15mol and 0.1-4mol to 12 atoms of molybdenum immediately after the mixing of all constitutional components. When both radicals are out of a prescribed range, aqueous ammonia and/or ammonium nitrate are appropriately added.