Process for producing composite oxide catalysts
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsKohei Sarumaru, Etsuji Yamamoto, Teruo Saito
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Abstract
In the production of a Mo-Bi-Na composite oxide catalyst by the process comprising incorporating compounds as respective element sources into a composite and subjecting the composite to heat treatment, a bismuth subcarbonate in which at least a part of required Na has been solid-dissolved is used as a Bi source compound. The activity of the catalyst is significantly improved by introducing Bi and Na in the form of the specified water insoluble compound into the catalyst.
Claims7
A process for producing a composite oxide catalyst, wherein a Mo-Bi composite oxide catalyst represented by the following formula is produced by a process comprising incorporating the compounds as respective element sources into a composite in an aqueous system and subjecting the composite to heat treatment, characterized in that use is made as a Bi source of a compound of bismuth carbonate complex of (a) Bi and Na, or (b) Bi, Na and X or (c) Bi and X which comprises at least a part of each of the required Na and/or X
- Mo.sub.a Bi.sub.b Co.sub.c Ni.sub.d Fe.sub.e Na.sub.f X.sub.g Y.sub.h Z.sub.i Si.sub.j O.sub.k
- wherein:
- X represents Mg, Ca, Zn, Ce and/or Sm;
- Y represents K, Rb, Cs and/or Tl;
- Z represents B, P, As and/or W;
- a-k represent atomic ratios, respectively, and when a equals 12, b=0.5 to 7, c=0 to 10, d=0 to 10, c+d=1 to 10, e=0.05 to 3, f=0.01 to 1, g=0 to 1, h=0.04 to 0.4, i=0 to 3, j=0 to 48 and k is a numeral which satisfies the oxidation state of the other elements.
A process for producing a composite oxide catalyst, wherein a Mo-Bi composite oxide catalyst represented by the following formula is produced by a process comprising incorporating the compounds as respective element sources into a composite in an aqueous system and subjecting the composite to heat treatment, characterized in that use is made, as a Bi source, of a compound of bismuth subcarbonate in which at least a part of the required Na has been dissolved in the solid state:
- Mo.sub.a Bi.sub.b Co.sub.c Ni.sub.d Fe.sub.e Na.sub.f Y.sub.h Z.sub.i Si.sub.j O.sub.k
- wherein:
- Y represents K, Rb, Cs and/or Tl;
- Z represents B, P, As and/or W;
- a-b and h-k represent atomic ratios, respectively, and when a equals 12, b=0.5 to 7, c=0 to 10, d=0 to 10, c+d=1 to 10, e=0.05 to 3, f=0.01 to 1, h=0.04 to 0.4, i=0 to 3, j=0 to 48 and k is a numeral which satisfies the oxidation state of the other elements.
A process for producing a composite oxide catalyst, wherein a Mo-Bi composite oxide catalyst represented by the following formula is produced by a process comprising incorporating the compounds as respective element sources into a composite in an aqueous system and subjecting the composite to heat treatment, characterized in that use is made as a Bi source of a compound of bismuth carbonate complex of (a) Bi, Na and X, or (b) Bi and X which comprises at least a part of each of the required Na and X or X:
- Mo.sub.a Bi.sub.b Co.sub.c Ni.sub.d Fe.sub.e Na.sub.f X.sub.g Y.sub.h Z.sub.i Si.sub.j O.sub.k
- wherein:
- X represents Mg, Ca, Zn, Ce and/or Sm;
- Y represents K, Rb, Cs and/or Tl;
- Z represents B, P, As and/or W;
- a-k represent atomic ratios, respectively, and when a equals 12, b=0.5 to 7, c=0 to 10, d=0 to 10, c+d=1 to 10, e=0.05 to 3, f=0.01 to 1, g=0.01 to 1, h=0.04 to 0.4, i=0 to 3, j=0 to 48 and k is a numeral which satisfies the oxidation state of the other elements.
A process for producing a composite oxide catalyst, wherein a Mo-Bi composite oxide catalyst represented by the following formula is produced by a process comprising incorporating the compounds as respective element sources into a composite in an aqueous system and subjecting the composite to heat treatment, characterized in that use is made as a Bi source of a compound of bismuth carbonate complex of bi and X which comprises at least a part of the required X
- Mo.sub.a Bi.sub.b Co.sub.c Ni.sub.d Fe.sub.e Na.sub.f X.sub.g Y.sub.h Z.sub.i Si.sub.j O.sub.k
- wherein:
- X represents Mg, Ca, Zn, Ce and/or Sm;
- Y represents K, Rb, Cs and/or Tl;
- Z represents B, P, As and/or W;
- a-k represent atomic ratios, respectively, and when a equals 12, b=0.5 to 7, c=0 to 10, d=0 to 10, c+d=1 to 10, e=0.05 to 3, f=0 to 1, g=0.01 to 1, h=0.05 to 0.4, i=0 to 3, j=0 to 48 and k is a numeral which satisfies the oxidation state of the other elements.
Dependencies are inferred from the claim text.