Catalyst as well as preparation method and application thereof

The invention discloses a catalyst and a preparation method and application thereof. The catalyst has the following general formula: Mo, P, V, Sb and O respectively represent molybdenum, phosphorus, vanadium, antimony and oxygen; D is at least one element selected from the group consisting of iron, cobalt, nickel, manganese, copper, palladium and magnesium; E is at least one element selected fromthe group consisting of tungsten, bismuth, boron, arsenic and tin; Z is a cocatalyst and is at least one compound selected from citric acid, tartaric acid, oxalic acid and maleic acid; a = 0.1-3, b =0.01-3, c = 0.01-5, d = 0.1-3, e = 0.01-2, f is the ratio of oxygen atoms required to satisfy valence; and beta/alpha = 2-30 wt%; the preparation method of the catalyst sequentially comprises the following steps:(i)providing a dispersion liquid of a catalyst precursor containing all catalyst components; and(ii)adding the cocatalyst compound Z, and roasting. Alpha(Mo12PaVbSbcDdEeOf)/betaZ. 公开了催化剂及其制备方法和用途。该催化剂具有如下通式，其中，Mo、P