In this work the Bamberger rearrangement reaction for p-aminophenol(PAP)prepared by electrochemical reduction of nitrobenzene was investigated.Cyclic voltammetry was used to investigate the catalytic effect of several catalysts,and the peak current of the reduction of nitrobenzene obviously increased when kieselguhr,sulphated zirconia and beta zeolite were added,respectively.The rearrangement of phenylhydroxylamine(PHA)was studied in the presence of catalysts.It has been found that the best experimental conditions in acid solution were:the concentration of H+was 0.5 mol·