in the present invention is selectively partially oxidizing palladium phthalocyanine complex so that it does not form palladium oxide which is difficult to react with mineral acid under normal processing conditions b recovery of pure palladium with 99 100 purity and 95 100 recovery as palladium chloride by judicially adjusting the ph of the aqueous solution and thereby removing the impurities namely iron zinc nickel and silica c recovery of pure palladium without resorting to the use expensive and hazardous organic solvent and complexing ligands d recovery of pure palladium without destroying structure of the inorganic support namely silica in the present case the following examples are given by way of illustration and therefore should not be constructed to limit the scope of the present invention 500 g of spent silica wherein palladium is present as a mixture of palladium phthalocyanine complexes adsorbed on silica gel was taken in a china dish and kept at 400 u00b0 c in a muffle furnace in air atmosphere for three hour and than allowed to cool to ambient temperature 1000 ml 2m aqueous hydrochloric acid solution was taken in a 5 liters round bottom flask equipped with heating mantle and thermocouple to heat the content of the round bottom flask at constant temperature.