| 摘要 |
PROBLEM TO BE SOLVED: To increase the selection rate of an acrylic acid by catalytically oxidizing hydrocarbons in the gas phase with high catalytic activity by making a metallic oxide whose percentage of a metallic element is expressed by a specific composition formula or an inorganic mixture containing the oxide, come into contact with hydrogen peroxide. SOLUTION: A metallic oxide, the percentage of a metallic element of which is represented by the formula: MoViSbjAk (wherein, A is one or more kinds of metallic element selected from the group of Nb,Ta,Sn,W,Ti,Co and the like and Ce; (i) and (j) are each 0.01-1.5 and j/i = 0.3-1; k is 0.001-3.0) or an inorganic mixture containing the metallic oxide, is manufactured by dissolving or dispersing a chemical compound containing Mo, V, Sb and the other metallic part in water or an organic solvent and mixing each of these components as uniformly as possible. After mixing the components sufficiently, a liquid medium is removed and the remaining solid mixture is ground to the appropriate grain size. Further the grinds are brought into contact with a hydrogen peroxide solution and the powder of the metallix oxide or the inorganic mixture is obtained through a separation process. Thus it is possible to manufacture acrylic acid at a high yield by catalytically oxidizing hydrocarbons in the gas phase with high catalytic acitivity. |
