| 摘要 |
<p>The invention relates to a method for regenerating a catalyst comprising a heteropolyacid compound for the production of a methacrylic acid, wherein the heteropolyacid compound comprises a phosphorus, a molybdenum and at least one element X selected from a group composed of a potassium, a rubidium, a cesium and a thallium. The method comprises the following steps: (I) mixing a deterirated catalyst recovered from the preparation technology of the methacrylic acid and used for preparing the methacrylic acid, a nitrate ion, an ammonium ion and water to form a water based slurry A, wherein the atomic ratio of the element X to the molybdenum is adjusted to 2:12 to 4:12; (II) mixing a start compound of the heteropolyacid compound with the water to form a water based slurry B, wherein the atomic ratio of the element X and the molybdenum is adjusted to 0:12 to 0.5:12; and (III) mixing the water based slurry A obtained from the step (I) with the water based slurry B obtained from the step (II) and then drying and calcining the mixture, wherein the atomic ratio of the element X in the heteropolyacid compound for forming the regeneration catalyst to the molybdenum is adjusted to 0.5:12 to 2:12.</p> |
