CATALYST FOR SELECTIVE OXIDATION OF HYDROGEN SULFIDE, METHOD OF PREPARATION THEREOF, AND A PROCESS OF SELECTIVELY OXIDIZING HYDROGEN SULFIDE TO ELEMENTAL SULFUR Russian patent published in 2006 - IPC C01B17/04 B01D53/86 B01J27/18 B01J37/04 B01J37/08 

FIELD: gas treatment processes and catalysts.

SUBSTANCE: invention relates to catalyst for selectively oxidizing hydrogen sulfide to sulfur in industrial gases containing 0.5-3.0 vol % hydrogen sulfide and can be used at enterprises of gas-processing, petrochemical, and other industrial fields, in particular to treat Claus process emission gases, low sulfur natural and associated gases, chemical and associated petroleum gases, and chemical plant outbursts. Catalyst for selective oxidation of hydrogen sulfide into elementary sulfur comprises iron oxide and modifying agent, said modifying agent containing oxygen-containing phosphorus compounds. Catalyst is formed in heat treatment of α-iron oxide and orthophosphoric acid and is composed of F₂O₃, 83-89%, and P₂O₅, 11-17%. Catalyst preparation method comprises mixing oxygen-containing iron compounds with modifying agent compounds, extrusion, drying, and heat treatment. α-Iron oxide used as oxygen-containing iron compound is characterized by specific surface below 10 m²/g, while 95% of α-iron oxide have particle size less than 40 μm. Orthophosphoric acid is added to α-iron oxide, resulting mixture is stirred, dried, and subjected to treatment at 300-700°C. Hydrogen sulfide is selectively oxidized to elemental sulfur via passage of gas mixture over above-defined catalyst at 200-300°C followed by separation of resultant sulfur, O₂/H₂S ratio in oxidation process ranging from 0.6 to 1.0 and volume flow rate of gas mixture varying between 900 and 6000 h^-1.

EFFECT: increased yield of elemental sulfur.

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