Catalytic wet air oxidation of sodium sulfide solutions. Effect of the metal-support and acidity of the catalysts
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This work evaluates the catalytic wet air oxidation of sulfide present in spent caustic wastes generated during petroleum refining. Operating conditions were 70 °C and atmospheric pressure, with and without catalyst. Two supports (silica and clinoptilolite) and two metal oxides (vanadium and copper) were employed to produce different catalysts. The sulfide oxidation without catalyst displays a short induction period and complete oxidation of sulfide at 210 min. The most active catalysts were Cu/silica (CS) and V/clinoptilolite (VC), which improved the sulfide oxidation, achieving complete oxidation in 20 and 26 min, respectively. © 2011 Springer Science%2bBusiness Media, LLC.
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Clinoptilolite; Copper; CWAO; Silica; Sulfide; Vanadium Active catalyst; Catalytic wet air oxidation; Clinoptilolites; Complete oxidation; Cu/silica; CWAO; Induction periods; Metal oxides; Metal-supports; Operating condition; Sodium sulfides; Spent caustic; Sulfide; Sulfide oxidation; Atmospheric pressure; Catalytic oxidation; Copper oxides; Oxidation; Petroleum refining; Silica; Sodium; Sodium compounds; Vanadium; Vanadium alloys; Zeolites; Catalyst supports
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