| 摘要 |
Novel compounds particularly suitable as oxidation catalysts, for example in the reaction of propylene with ammonia and a gas containing molecular oxygen to produce acrylonitrile, are prepared using critical amounts of uranium, antimony and tin. The catalyst may be defined by the following stoichiometry: USbaSnbO8-12, wherein a is the number about 2.75 to about 1.35 and b is the number about 0.25 to about 1.65 and, additionally, wherein the atomic ratios of the sum of antimony and tin to uranium is within a range of about 3.5:1 to about 2.5:1. The catalyst compound may be obtained by heating (1) oxides of uranium, antimony and tin, or(2) compounds of said elements that will decompose or be converted to said oxides during heating, wherein the atomic ration of antimony to uranium is about 2.75:1 to about 1.35:1, the atomic ration of tin to uranium is about 0.25:1 to about 1.65:1 and the atomic ration of the sum of antimony and tin to uranium is about 3.5:1 to about 2.5:1, in an atmosphere containing molecular oxygen at a temperature of at least about 800.degree.C. for about 15 minutes to about 24 hours. |
