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 gr
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 alkaline earth metals, D represents at least one element selected from the group consisting of silicon, aluminum and titanium, 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 m2/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 mmm
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A catalyst for use in the production of acrylic acid by catalytic gas phase oxidation of acrolein, comprising active substances represented by general formula wherein Mo represents molybdenum, V represents vanadium, A represents at least one element selected from the group consisting of tungsten and
A catalyst for use in the production of acrylic acid by catalytic gas phase oxidation of acrolein, comprising active substances represented by general formula 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 alkaline earth metals, D represents at least one element selected from the group consisting of silicon, aluminum and titanium, and O represents oxygen; and further, a, b, c, d, e, f and x represents 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 said catalyst being prepared by charging an unfired catalyst material powder into a centrifugal flow coating apparatus to form particles, and firing the particles, wherein said particles are characterized by having a specific surface area of 0.50 to 15.0 m2/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 each of the ranges of from 0.1 to less than 1.0 m1.0 to less than 10.0 m10.0 to 100 m
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이 특허에 인용된 특허 (3)
Krabetz Richard (Kirchheim DEX) Herrmann Walter (Mannheim DEX) Scholz Norbert (Ludwigshafen DEX) Engelbach Heinz (Limburgerhof DEX) Engert Gerd-Juergen (Frankenthal DEX) Willersinn Carl-Heinz (Ludwig, Catalyst for the oxidation of acrolein and methacrolein to acrylic acid and methacrylic acid, respectively.
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