Catalytic process for removing sulfur dioxide from gas streams
AssigneeGTE Laboratories Incorporated
InventorsFrank C. Palilla, Gary G. Gaudet, Helmut Lingertat
Life of this patent
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Abstract
This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, and a catalyst of the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd.
Claims21
A process for removing sulfur dioxide from a gas stream containing sulfur dioxide comprising passing a gas stream containing sulfur dioxide and a sufficient amount of carbon monoxide or hydrogen to reduce at least a portion of said sulfur dioxide to elemental sulfur through a reaction chamber charged with a material of the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature a product stream containing elemental sulfur and carbon dioxide or water, and thereafter removing said elemental sulfur from said product stream.
A process for removing sulfur dioxide from a gas stream containing sulfur dioxide comprising adding carbon monoxide or hydrogen to a gas stream containing sulfur dioxide and oxygen to thereby provide a gaseous reaction stream, the total amount of carbon monoxide or hydrogen in said gaseous reaction stream being approximately the stoichiometric amount required for reduction of all oxidants in said gaseous reaction stream, heating said gaseous reaction stream to a temperature in the range from about 450.degree.C to about 700.degree.C, passing said heated gaseous reaction stream through at least one reaction chamber charged with a material represented by the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd, to catalytically produce a product stream comprising elemental sulfur, carbon dioxide or water, and not greater than minimal quantities of hydrogen sulfide and carbonyl sulfide, and thereafter remving said elemental sulfur from said product stream.
Dependencies are inferred from the claim text.