초록 ▼

A process for optimizing the removal of nitrogen oxide (NOx) and sulfur oxide (SOX) from flue gases is provided in which the flue gases pass over a lanthanide-oxygen-sulfur catalyst. The catalyst has active sites provided on its surface which promote the dissociation of NOX and receive and entrap ox

A process for optimizing the removal of nitrogen oxide (NOx) and sulfur oxide (SOX) from flue gases is provided in which the flue gases pass over a lanthanide-oxygen-sulfur catalyst. The catalyst has active sites provided on its surface which promote the dissociation of NOX and receive and entrap oxygen released during the dissociation of the NOX. While the flue gases pass over the catalyst, a reducing gas contacts the catalyst to reduce the oxygen on the active sites of the catalyst and permit the catalyst to continue to promote the dissociation of the NOx in the flue gas. If the flue gases contain SOX, they are then passed over a solid solution having a solvent of a first lanthanide oxide compound which crystallizes in the fluorite habit and a solute of at least one altervalent oxide of a second lanthanide. The SOX in the flue gases reacts with the solid solution to form a sulfated lanthanide oxide which is removed from the flue gases. The sulfated lanthanide oxide may then be dissociated by raising its temperature to regenerate the lanthanide oxide.

대표청구항 ▼

A process for optimizing the removal of NOx and SOx from flue gases comprising the steps of: (a) initially passing said flue gases over one of a lanthanide sulfate catalyst and a lanthanide oxy-sulfate catalyst in a first reaction vessel, said catalyst having active sites for entrapping oxygen provi

A process for optimizing the removal of NOx and SOx from flue gases comprising the steps of: (a) initially passing said flue gases over one of a lanthanide sulfate catalyst and a lanthanide oxy-sulfate catalyst in a first reaction vessel, said catalyst having active sites for entrapping oxygen provided on the surface thereof, wherein said active sites promote the dissociation of said NOx in said flue gases and receive and entrap oxygen released during said dissociation of said NOx; (b) contacting said catalyst with at least one reducing gas to reduce said oxygen received and entrapped on said active sites of said catalyst to permit said catalyst to continue to promote said dissociation of said NOx in said flue gases; (c) subsequently passing said flue gases over a solid solution in a second reaction site in the process, said solid solution comprising a solvent of a first lanthanide-oxygen compound which crystallizes in the fluorite habit and a solute of at least an alternate oxide of at least one of a second lanthanide and an alkaline earth metal wherein said SOx in said flue gases reacts with said solid solution to form a sulfated lanthanide-oxygen-sulfur compound; and (d) removing said sulfated lanthanide-oxygen-sulfur compound from contact with said flue gases and raising the temperature of said sulfated lanthanide-oxygen-sulfur compound sufficiently high to cause dissociation of said sulfated lanthanide-oxygen-sulfur compound whereby said lanthanide-oxygen compound is regenerated.