Catalyst for preparing unsaturated aldehyde through olefin oxidation, preparation method and application thereof

The invention discloses a catalyst for preparing unsaturated aldehyde through olefin oxidation, a preparation method and application thereof. According to the invention, by optimizing the content of bismuth, cobalt and iron and adding molybdenum and bismuth in the active components of the catalyst in the form of bismuth molybdate, the release amount of volatile matter in the activation process of the catalyst is reduced, so that the catalyst has more stable chemical structure while improving physical properties of the catalyst, the prepared catalyst has characteristics of good mechanical strength, high reaction activity, high selectivity and good stability at a high space velocity, the catalyst with excellent catalytic performance can be obtained in a long period and in a high yield manner, the defect that the yield of a target product is rapidly reduced due to the fact that the activity aging rate of an existing catalyst is high under the working condition of high space velocity in the process of preparing a