| abstract |
A method of preparing a catalyst comprises combining in an aqueous solution, an acid or salt of molybdenum with a water-soluble acid or non-metallic salt of silicon, phosphorus or arsenic, which is capable of forming a polyhedra of molybdenum. An aqueous chloride ion and a compound of phosphotungstate, silicotungstate, vanadium arsenate, silicoarse- nate, phosphovanadate, silicovanadate or corresponding acids thereof or mixtures thereof are then added to the mixture. The resulting combination is dried and calcined to yield the finished catalyst.The oxidation catalyst has the following empirical formula:whereY is phosphorus, arsenic, silicon or mixtures thereof,A is tungsten, vanadium, arsenic, when Y is not arsenic,or mixtures thereof,w ranges from 0.5 to 1.5,x ranges from 10 to 15,y ranges from 0.1 to 2.0, andz ranges from 1 to 42, and is an integer necessary to satisfy the valency requirements of the formula. |