| 摘要 |
PURPOSE:To restore the composite oxide catalyst containing one or more kinds of metal including Sb, Fe, Cu and Ni once deteriorated in performance to a level equal to the new one in the yield and reaction velocity on the activated surface thereof by baking thereof within a given temperature range after immersed into or sprayed by nitric acid or a solution of nitrate (e.g. NH4NO3). CONSTITUTION:The composite oxide catalyst containing Sb previously deteriorated in the performance through application to exidation of hydrocarbons, ammoxidation or oxidizing dehydrogenation by the following procedure: The catalyst is immersed into or sprayed by nitric acid or a solution of nitrate (e.g. NH4CO3) and then, allowed to dry. Subsequently, it is baked in a non-reductive atmosphere such as air at 400 to 1,000 deg.C for regeneration. 0.01 to 50% by weight is preferable for the nitric acid or the solution of nitrate in the immersion of the catalyst to be treated. For the catalyst to be treated, composite oxide one as shown by the formula Fe10Sb25O65(SiO2)30 is available. |
