Process for removing nitrogen monoxide present in gaseous effluents originating from organic synthesis plants making use of oxidation reactions using nitric acid, by catalytic destruction at high temperature on catalysts based on H-mordenites or ammonium mordenites, preferably iron-, cobalt- or bismuth-ammonium mordenites. Application to the effluents from manufacture of adipic acid, of glyoxal or of glyoxylic acid by nitric oxidation processes.
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