| 摘要 |
PURPOSE:To provide a catalyst with sufficient strength, proper bulk density, high activity and high selectivity for a fluidized bed wherein the catalyst can be used for a fluidized bed which is of a great advantage over a fixed bed, in a reaction to prepare pyromellic acid anhydride by gas phase catalytic oxidation of durene. CONSTITUTION:A fluidized bed catalyst for gas phase catalytic oxidation of durene is composed of 70-97 pts. by wt. of (A) component consisting of titanium oxide, silica, and boron oxide and 3-30 pts. by wt. of (B) component of at least one compound selected from molybdenum oxide, antimony oxide, bismuth oxide, and tungsten oxide, and regarding the (A) component, the ratios B2O3/TiO2 (weight ratio) and SiO2/TiO2 (weight ratio) are within ranges, (0.02-0.5) and (0.1-0.9), respectively. |
