| abstract |
The present invention is a fluidised-bed catalyst for producing acrylonitrile by the ammoxidation of propylene, which comprises a silica carrier and a composite having the following formula: AaCcDdNafFegBihMiMo12Ox, wherein A is at least one selected from the group consisting of potassium, rubidium, cesium, samarium, thallium and a mixture thereof; C is at least one selected from the group consisting of phosphor, arsenic, boron, stibium, chromium and a mixture thereof; D is selected from nickel, cobalt or a mixture thereof; M is selected from tungsten, vanadium or a mixture thereof. The catalyst of the present invention particularly suits the use under higher pressures and higher duties, and still maintains very high single-pass yield of acrylonitrile and a high ammonia conversion. This catalyst particularly suits the requirement for existing acrylonitrile plants to raise capacity. For new plants, it can also reduce the investment of the catalyst and the pollution. |