| 摘要 |
PURPOSE:To efficiently regenerate a deactivated Pd supporting catalyst by immersing the catalyst in a hydrohalogenic acid, adding alkali to the acid and heating the catalyst in the resulting alkaline aq. soln. CONSTITUTION:An arom. halogen compd. is dehalogenated and dimerized with a Pd supporting catalyst to produce the dimer of an arom. compd. At this time, the catalyst is deactivated. This deactivated catalyst is immersed in a hydrohalogenic acid such as hydrochloric acid, alkali is added to the acid to adjust the pH to 80-13, preferably 9-12 and the catalyst is heated in the resulting alkaline aq. soln. at 40-150 deg.C. By this treatment, the catalyst can be easily and efficiently regenerated and a high rate of conversion and a high yield are restored. |
