| 摘要 |
There is provided a hetero polyacid-based catalyst for methacrylic acid production, which is more excellent in performance, life and moisture absorption during storage. A catalyst for methacrylic acid production, wherein a proton is replaced so as to satisfy conditions of ± = A + (B × C) and 0.5 ‰¤ ± ‰¤ 1.4 when the atomic ratio of the alkali metal atom relative to 10 atoms of Mo is taken as A and the atomic ratio of the copper atom relative to 10 atoms of Mo is taken as B in Mo a P b V c Cu d Y e Z f O g where Y represents cesium or the like; Z represents iron or the like; and a to g represent each an atomic ratio of each element relative to 10 atoms of Mo. |
