| 摘要 |
<p>The invention relates to a method for decomposing N2O during the production of nitric acid by bringing the waste gas, which contains N2O and which is exiting the absorption column, into contact with a catalyst containing at least one oxidic cobalt compound and at least one oxidic magnesium compound. The waste gas is brought into contact with the catalyst under conditions that permit N2O to be converted into gaseous nitrogen and oxygen. The content of oxidic cobalt compounds ranges from 0.1 to 50 wt. %, and the content of oxidic magnesium compounds range from 50 to 99.9 wt. % each with regard to the total mass of the catalyst. At least 30 % of the cobalt atoms in the catalyst are provided in a trivalent state. The production of the catalyst includes a dry mixing of the oxidic cobalt compounds and the oxidic magnesium compounds or corresponding precursors, which are transformed into oxidic compounds by annealing, and involves a compacting of the mixture while eliminating water until the resulting catalyst has the desired bulk density.</p> |
