Catalyst and preparation of methacrolein and methacrylic acid

Synthesizing catalyst and preparation method for synthesizing methacrolein and methacrylic acid and methacrolein and methacrylic acid according to the present invention relates mainly to solve the prior art catalysts for selective oxidation reaction of isobutylene poor stability problems. By the present invention, methacrolein and methacrylic acid catalyst employed, the active component of the catalyst having the general formula: Mo12BiaFebCocXdYeZfOx; wherein X is selected from W, V, Ni, Cr, Mn, Nb, Re, La at least one; Y is at least one selected from Sn, Sr, Zn, Ti or Zr.; Z is selected from Na, Li, Tl, K, Cs, Mg or Ca in at least one embodiment, preferably solve the above problem, it can be used for industrial production of methacrolein and methacrylic acid.