| 摘要 |
An improvement is provided in a process for the catalytic, low temperature oxidation of ammonia with oxygen to nitrogen in an ammonia-containing off gas at a temperature of between 200.degree.C and 500.degree.C. The improvement includes the first step of sulphating a catalyst which may be one of the following three alternative catalysts: two components, one component comprising at least one oxide of a metal which is selected from the group consisting of copper, cobalt, iron, chromium, nickel, manganese and mixtures thereof, and a further component which is selected from the group consisting of the platinum metals, both such components being on an inert carrier; two components, one component comprising at least one sulphate of a metal which is selected from the group consisting of copper, cobalt, iron, chromium, nickel, and manganese, and mixtures thereof, and a further component which is selected from the group consisting of the platinum metals, both such components being on an inert carrier; and three components, one component comprising at least one oxide of a metal which is selected from the group consisting of copper, cobalt, iron, chromium, nickel, and manganese and mixtures thereof, a second component comprising at least one sulphate of a metal which is selected from the group consisting of copper, cobalt, iron, chromium, nickel, and manganese, and mixtures thereof, and a further component which is selected from the group consisting of the platinum metals, all such components being on an inert carrier. The next step comprises contacting the ammonia-containing off-gas with the sulphated catalyst. The third step comprises withdrawing a decomposed gas therefrom which is rich in nitrogen.
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