Preparation of Pd/C catalysts for the synthesis of 3,3',4,4'-biphenyltetracarboxylic acid
Pd/C catalyst for synthesis of 3,3',4,4'-biphenyltetracarboxylic acid was prepared by impregnation precipitation method.The effects of precipitants and reductants on the performance of Pd/C catalyst were investigated.It was found that precipitants and reductants had obvious different effects on catalyst activity and the yield of 3,3',4,4'-biphenyltetracarboxylic acid.The Pd/C catalyst reduced by sodium borohydride had the highest activity and yield of 3,3',4,4'-biphenyl tetracarboxylic acid.The effect of co-catalysis of metal promoters on Pd/C performance was further investigated.The results show that the catalyst activity and the yield of 3,3',4,4'-biphenyltetracarboxylic acid are improved after adding 1.0％Mn to Pd/C.
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