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AssigneeMitsubishi Chemical Corporation
InventorsIsao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 μm accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 μm accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.03 μm is 10% or less of the total pore volume; a composite oxide catalyst for use in the vapor phase catalytic oxidation of acrolein or methacrolein or the like which comprises Mo, Bi and a halogen; either of the above two composite oxide catalysts which comprises Mo, Bi, Fe, Si and an element selected from alkali metals and thallium, and optionally Co, Ni, Mg, Ca, Zn, Ce, Sm, a halogen, B, P, As and W; a method for preparing any of the above composite catalysts; and a method for using any of the above composite oxide catalysts.
A composite oxide catalyst used for oxidation of olefin and containing molybdenum and bismuth, characterized in that its specific surface area is in the range of 5-25 m2/g, and its pore volume is in the range of 0.2-0.7 cc/g, and that the pore diameter distribution is such that the volume of pores whose diameters are 0.03-0.1 μm is 30% or over of the total pore volume, the volume of pores whose diameters are 0.1-1 μm is 20% or over of the total pore volume, and the volume of pores whose diameters are less than 0.03 μm is 10% or less.
A composite oxide catalyst used for any of a vapor phase catalytic oxidation reaction for producing acrolein or methacrolein from propylene, isobutene or tertiary butanol, a vapor phase catalytic ammo-oxidation reaction for producing acrylonitrile or methacrylonitrile from propylene or isobutene, and a vapor phase catalytic oxidative dehydrogenation reaction for producing butadiene from butene, and containing Mo, Bi and a halogen as component elements.
Dependencies are inferred from the claim text.