| 摘要 |
1356124 Nitric oxide STAMICARBON NV 13 Oct 1971 [23 Oct 1970] 47678/71 Heading C1A In producing nitric oxide by the catalytic oxidation of ammonia with free oxygen containing gas, at a temperature in the range 675 to 750‹ C. the catalyst material used contains CO 3 O 4 and the supply of ammonia to the reaction zone is intermittently decreased or intermittently stopped. The period of time for which the decreased amount of ammonia is supplied or the ammonia supply is stopped may be not more than 10 minutes preferably 2 to 5 minutes. The amount of ammonia supplied in that period may be decreased by an amount of from 1% to 10% by volume preferably by 5% by volume. |
