Dynamics of liquid-phase catalytic oxidation of hydrogen sulfide removal in rural biogas

Abstract

Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation. By using rare earth as catalyst, and sulfosalicylic acid as stabilizer, H₂S purification efficiency could increase as high as 96%, and sulfur capacity of the composite solution was about 3 g/L. The results show that purification efficiency was affected by catalyst addition, pH, experimental temperature, and sulfur capacity. The parameters effects on catalytic oxidation were studied, and the optimized conditions were that Fe³⁺ concentration 0.08 mg/L, reaction temperature 70°C, pH 9.0, with a absorption solution volume of 50 mL, a gas flow rate 200 mL/min, and H₂S mass concentration of 1.58–2.02 mg/m³.

Keywords

liquid phase catalytic oxidation / hydrogen sulfide / rural biogas / purification efficiency / rare-earth

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