PROCESS FOR PREPARING UNSATURATED NITRILE

摘要

A process for preparing acrylonitrile or methacrylonitrile, which comprises adding a molybdenum compound which is not supported on any carrier and which, during ammoxidation, can be converted to molybdenum oxide in such a manner that the atomic ratio y of molybdenum in an oxide catalyst represented by the general formula: MoyBipFeqAaBbCcDdEeOf is kept between 1.02x and 1.12x (wherein x = 1.5p + q + a + c + 1.5d + 1.5e) as an activating agent to a fluidized bed reaction.