Process for removing sulfur oxides and nitrogen oxides from flue gases
First Claim
1. A process for removing at least one of nitrogen oxides and sulfur oxides contained in a flue gas, which comprises contacting a flue gas containing at least one of nitrogen oxides and sulfur oxides with a catalyst comprising a carbonaceous material impregnated with at least one of bromine, iodine, chlorine, ammonium bromide, ammonium iodide, ammonium chloride, hydrogen bromide, hydrogen iodide and hydrogen chloride, and at least one of metal elements of groups 1B, 3B, 4B, 5B, 6B, 2A, 3A and 8 of the periodic table as a promoter in the presence of ammonia.
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Abstract
A catalyst comprising carbonaceous materials such as activated carbon, etc. impregnated with bromine, iodine, chlorine or their compounds, is impregnated with a promoter containing a specific metal, and brought in contact with a flue gas in the presence of ammonia, whereby nitrogen oxides and sulfur oxides contained in the flue gas are removed with a very high percent removal. The removal can be carried out at a temperature much lower than that of the conventional process.
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26 Claims
- 1. A process for removing at least one of nitrogen oxides and sulfur oxides contained in a flue gas, which comprises contacting a flue gas containing at least one of nitrogen oxides and sulfur oxides with a catalyst comprising a carbonaceous material impregnated with at least one of bromine, iodine, chlorine, ammonium bromide, ammonium iodide, ammonium chloride, hydrogen bromide, hydrogen iodide and hydrogen chloride, and at least one of metal elements of groups 1B, 3B, 4B, 5B, 6B, 2A, 3A and 8 of the periodic table as a promoter in the presence of ammonia.
- 16. A process for removing nitrogen oxides from a gas mixture containing nitrogen oxides comprising simultaneously contacting said gas mixture with (1) ammonia and (2) a catalyst comprising a carbonaceous material impregnated with (a) at least one halogenous material selected from the group consisting of bromine, iodine, chlorine, ammonium bromide, ammonium iodide, ammonium chloride, hydrogen bromide, hydrogen iodide and hydrogen chloride and (b) at least one metal of groups 1B, 3B, 4B, 5B, 6B, 2A, 3A and 8 of the Periodic Table.
Specification