Patent ID: 8034737

Claim:
A catalyst for having a composition represented by formula (1): Mo a Bi b Fe c W d Rb e A f B g C h D i O j (SiO 2 ) k (1) wherein A is at least one element selected from the group consisting of nickel, magnesium, calcium, strontium, barium, manganese, cobalt, copper, zinc, and cadmium; B is at least one element selected from the group consisting of aluminum, chromium, gallium, yttrium, indium, lanthanum, cerium, praseodymium, neodymium, and samarium; C is at least one element selected from the group consisting of titanium, zirconium, vanadium, niobium, tantalum, germanium, tin, lead, antimony, phosphorous, boron, and tellurium; D is at least one element selected from the group consisting of ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum, and silver; SiO 2 is silica; a, b, c, d, e, f, g, h, i, j and k are atomic ratios of each element, or silicon in the case of silica, wherein, when a=10, b is 0.1 to 1.5, c is 0.5 to 3.0, d is 0.01 to 2.0, e is 0.02 to 1.0, f is 2.0 to 9.0, g is 0 to 5, h is 0 to 3, i is 0 to 2, and k is 10 to 200, and j is the atomic ratio of oxygen required to satisfy the valence of each of the elements, excluding silicon; and (a×2+d×2)/(b×3+c×3+e×1+f×2+g×3) is 0.90 to 1.00.