Method for producing acrylonitrile, catalyst for use therein and method for preparing the same

A process for producing acrylonitrile, which comprises using a fluidized bed catalyst of a composition represented by the following empirical formula in the production of acrylonitrile by ammoxidation of propylene,

• Fea Sbb Moc Bid Ke Ff Gg Hh Qq Rr Tt Ox (SiO2)y
• wherein Fe, Sb, Mo, Bi and K are iron, antimony, molybdenum, bismuth and potassium, respectively;
• F is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, manganese, cobalt, nickel, copper, silver, zinc and cadmium;
• G is at least one element selected from the group consisting of chromium, aluminum, gallium and indium;
• H is at least one element selected from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium and samarium;
• Q is at least one element selected from the group consisting of titanium, zirconium, vanadium, niobium, tantalum, tungsten, germanium, tin and lead;
• R is at least one element selected from the group consisting of lithium, sodium, rubidium, cesium and thallium;
• T is at least one element selected from the group consisting of boron, phosphorus and tellurium;
• O is oxygen;
• Si is silicon;
• and affixes a, b, c, d, e, f, g, h, q, r, t, x and y are independently of one another an atomic ratio, provided that a is a number larger than 0, and when a=10, then b=5 to 60, c=5 to 50, d=0.15 to 5, e=0.1 to 5, f=2 to 35, g=0.05 to 10, h=0.05 to 10, h/c is larger than 0.02, q=0 to 10, r=0 to 5, t=0 to 5, x is a number of oxygen in a metal oxide formed by bonding of said respective components, and y=20 to 500;
• and in which iron antimonate exists as a crystal phase.