| 摘要 |
PURPOSE:To obtain a heteropoly-acid comp. catalyst which is excellent in selectivity, yield, activity and catalytic strength for methacrylic acid by adding potassium or the like and copper, etc. to isolated molybdovanadophosphoric acid having rhombic system catalyst structure. CONSTITUTION:In an oxidation catalyst shown by the formula PaMobVcXdYe Of, molybdovanadophosphoric acid having rhombic system crystal structure which is manufactured under the existence of quinolines and/or quinoline derivatives is contained. (X is at least one or more kinds of elements selected among K, Rb, Cs, Ca, Sr and Ba, Y is at least one or more kinds of elements selected among Cu, Ag, As, Sb, Te, Co and Bi, (a)-(f) shown atomic ratio of each element respectively and when (b) is 12, a=0.1-3.0, c=0.1-6.0, d=0.05-6, e= 0.01-5.0 and (f) is value decided by the valence of each element and the atomic ratio.) The catalyst is excellent in selectivity, yield, activity and catalytic strength for methacrylic acid. |
