| 摘要 |
PURPOSE:To industrially and advantageously produce an unsaturated carboxylic acid from an unsaturated aldehyde using a catalyst having high practicality of all the activity, selectivity and life. CONSTITUTION:An unsaturated aldehyde is catalytically oxidized with molecular oxygen in the vapor phase to produce an unsaturated carboxylic acid. In the process, a catalyst expressed by the general formula PaMobVcLadSmeCufXgOh [P, Mo, V, La, Sm, Cu and O respectively represent phosphorus, molybdenum, vanadium, lanthanum, samarium, copper and oxygen; X represents at least one selected from potassium, rubidium, cesium and thallium; (a), (b), (c), (d), (e), (f), (g) and (h) are atomic ratios of the respective elements; when (b) is 12, (a) is 0.5-3; (c) is 0.1-3; (d) is 0.01-3; (e) is a number of <=1 without including 0; (f) is 0.1-3; (g) is 0.01-2; (h) represents the number of oxygen atoms required to satisfy the valences of the aforementioned respective components] is used. |
