| 摘要 |
PURPOSE: To produce a catalyst for synthesis of methacrolein and methacrylic acid by dividing catalytic components into at least two kinds, making a slurry by mixing solutions or dispersions of respective kinds of components, and producing a composite oxide having a specified formula by drying and firing the slurry. CONSTITUTION: This catalyst contains a composite oxide as a catalytic component expressed by the formula, Moa Bib Fec Ad Xe Yf Zg Oh (A stands for nickel and/or cobalt; X for at least one element of magnesium, zinc, etc.; Y for at least one element of phosphorus, boron, etc.; Z for at least one element of potassium, sodium, etc.; a-h for atomic ratio of each element, and in the case of a=12, 0.1<=b<=5, 0.1<=c<=5, 1<=d<=12, 0<=e<=10, 0<=f<=10, 0.01<=g<=3; and h for the number of oxygen atoms necessary to satisfy the atomic ratios of respective components). To obtain the composite oxide, slurry like matter is heated at least 30 minutes while being stirred with weaker stirring force than that at the time of being mixing and then the mixture is fired. |
