Study On The Preparation Of PbO₂Electrode On Stainless Steel Substrate And Its Electro-catalytic Modification Of Kerosene

Recently, electro-catalytic oxidation technology is drawn much attention for the oxidativemodification of kerosene, because of its strong oxidizing ability, convenient operation, nopollution. The electrode plays a core role in the electro-catalytic oxidation process. So findingand preparing the electrode materials with high catalytic activity are very important. In thispaper, PbO2electrode is prepared on the stainless steel, and the effects of preparationconditions and electro-catalytic properties on the modified treatment of kerosene were studied.Via the theoretical analysis and combined with the structure characteristics of PbO2electrode, the optimum preparation process of PbO2electrode on stainless steel substrate wasobtained. α-PbO2as a middle layer electrode was first deposited on the pre-treated stainlesssteel substrate in alkali condition, and then β-PbO2as surface active electrode layer wasdeposited under acidic condition.The crystal structure and surface morphology of PbO2electrode on stainless steel wereanalyzed by XRD and SEM, respectively. It was found that the electrode was mainlyβ-PbO2with large grain size. At the same time, the uniformed grain size increased the density and thesurface area of the electrode, which was good to improve the electro-catalytic activity of PbO2electrodes. The oxygen evolution potential was1.804V and the accelerated service life wasup to62hours, which was determined from the anodic polarization curve and the constantcurrent polarization curve of PbO2electrode.The optimum process conditions of electro-catalytic oxidation of kerosene by using PbO2electrode were60mA/cm2of the current density,60min of the electrolysis time,0.1mol/LNa2SO4of the electrolyte concentration of and0.1mol/L Cl-. The acid value of the oxidizedkerosene reached10.37mgKOH/g, but without the acid value is only0.20mgKOH/g for theun-oxidized kerosene. Moreover, water contact angle was about85.426°for the oxidizedkerosene, and the contact angle is75.426°for the un-oxidized kerosene. The resultsdemonstrated that PbO2electrode on stainless steel substrate had better electro-catalyticoxidation performance on kerosene.Taking Ma Lan8#coal with a medium floatability as an example, using the acid value of10.37mgKOH/g oxidation kerosene as collector, the reagent consumption of collector and foaming agent were decreased by60%, the clean coal yield increased by2.41%and thecombustible recovery increased by4.56%, as compared with common kerosene. The resultssuggested the electro-catalytic kerosene by PbO2electrode on stainless steel substratepossessed improved flotation performance.