| abstract |
The present invention relates to a fluidized-bed ammonia oxidation catalyst comprising silica and a metal oxide, wherein the complex of silica and metal oxide is represented by the following general formula (1) Mo 12 Bi a Fe b Ni c Mg d Co e Ce f Cr g Zn h X i O j / (SiO 2 ) A (One) (In the formula (1), X is selected from the group consisting of K, Rb and Cs, 0.1? A? 1, 0.5 b? 4, 0.5 c? 6.5, 0.2 d? 2.5, (Mass%), and satisfies 35? A? 48, and satisfies the following formula (2): 0.2? F? 1.2, g? 0.05, h? , The values of?,? And? Calculated from the equations (3) and (4) satisfy 0.03?? 0.12, 0.1?? 0.7 and 0.2? α = 1.5a / (1.5 (b + g) + c + d + e + h) (2) beta = 1.5 (b + g) / (c + d + e + h) (3) ? = e / (c + d + h)? (4) |