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    • 9. 发明专利
    • ES2028180T3
    • 1992-07-01
    • ES88108780
    • 1988-06-01
    • NIPPON SHOKUBAI KAGAKU KOGYO KABUSHIKI KAISHA
    • KAWAJIRI, TATSUYAUCHIDA, SHINICHIWADA, MASAHIRO
    • B01J23/28B01J23/30B01J23/31B01J23/88B01J23/887B01J23/888B01J35/10B01J37/02C07B61/00C07C51/00C07C51/25C07C57/055C07C67/00C07C57/04
    • A catalyst for use in the production of acrylic acid by catalytic gas phase oxidation of acrolein, comprising active substances represented by general formula Mo(a)V(b)A(c)B(d)C(e)D(f)O(x) wherein Mo represents molybdenum, V represents vanadium, A represents at least one element selected from the group consisting of tungsten and niobium, B represents at least one element selected from the group consisting of iron, copper, bismuth, chromium, antimony and thallium, C represents at least one element selected from the group consisting of alkali metals and alkali earth metals, D represents at least one element selected from the group consisting of silicon, aluminum and tinanium, and O represents oxygen; and further, a, b, c, d, e, f and x represent atomic ratios of Mo, V, A, B, C, D, and O respectively, and when a=12, then b=2 to 14, c=0 to 12, d=0 to 6, e=0 to 6 and f=0 to 30 and x is a numerical value determined depending upon the oxidation states of the other elements, and characterized by having a specific surface area of 0.50 to 15.0 m /g, a pore volume of 0.10 to 0.90 cc/g and a pore diameter distribution in which the pore diameters are distributed concentratedly in the ranges of from 0.1 to less than 1.0 mu m, from 1.0 to less than 10.0 mu m and from 10.0 to 100 mu m. The catalyst can be prepared, with good reproducibility, by charging an unfired catalyst material powder composition into a centrifugal flow coating apparatus to form particles having an average diameter of 2 to 10 mm, and then firing the particles.