| 摘要 |
A silica-supported catalyst used when producing a corresponding unsaturated nitrile in a vapor-phase catalytic ammoxidation reaction of propane or isobutane, the catalyst including a metal oxide represented by the following formula (1),
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒMoV a Nb b X c T d Z e O n €ƒ€ƒ€ƒ€ƒ€ƒ(1)
(wherein X represents at least one or more elements selected from Sb and Te; T represents at least one or more elements selected from Ti, W, Mn, and Bi; Z represents at least one or more elements selected from La, Ce, Yb, and Y; and a, b, c, d, e, and n are in the range of 0.05 ‰¤ a ‰¤ 0.5, 0.01 ‰¤ b ‰¤ 0.5, 0.001 ‰¤ c ‰¤ 0.5, 0 ‰¤ d ‰¤ 1, and 0 ‰¤ e ‰¤ 1, respectively, and n denotes a value that satisfies an atomic valence)
wherein the silica-supported catalyst has an average pore size of 60 to 120 nm, a total pore volume of 0.15 cm 3 /g or more, a specific surface area of 5 to 25 m 2 /g, and a crystallite size of 40 to 250 nm as determined from half width of a (001) peak by X-ray diffraction. |
