Claims
- 1. In a process for gas-phase catalytic oxidization of acrolein to acrylic acid, the improvement comprising using a multimetal oxide composition which comprises, as basic constituents, the elements Mo, V, W, Cu and Ni in oxidic form, with the proviso that the following molar ratios exist between the elements:
- Mo:V=12:1 to 2:1,
- Mo:W=60:1 to 3:1,
- Mo:Cu=24:1 to 2:1, and
- Cu:Ni=5:1 to 1:3.
- 2. The process of claim 1, wherein the following molar ratios exist between said elements:
- Mo:V=12:1 to 2:1,
- Mo:W=60:1 to 3:1,
- Mo:Cu=24:1 to 2:1, and
- Cu:Ni=5:1 to 1:3,
- said catalyst conforms to formula I
- Mo.sub.12 V.sub.a W.sub.b Cu.sub.c Ni.sub.d X.sub.e.sup.1 X.sub.f.sup.2 X.sub.g.sup.3 X.sub.h.sup.4 X.sub.i.sup.5 O.sub.n (I)
- where
- X.sup.1 is one or more alkali metals,
- X.sup.2 is one or more alkaline earth metals,
- X.sup.3 is chromium, manganese, cerium and/or niobium,
- X.sup.4 is antimony and/or bismuth,
- X.sup.5 is silicon, aluminum, titanium and/or zirconium,
- a is from 1 to 6,
- b is from 0.2 to 4,
- c is from 0.5 to 6,
- d is from 0.2 to 6,
- c:d is from 5:1 to 1:3,
- e is from 0 to 2,
- f is from 0 to 3,
- g is from 0 to 5,
- h is from 0 to 40,
- i is from 0 to 40 and
- n is a number which is determined by the valency and occurrence of the elements in formula I other than oxygen.
- 3. The process of claim 1, wherein the ratio Cu:Ni=3:1 to 1:2.
- 4. The process of claim 3, wherein the ratio Cu:Ni=2:1.
- 5. The process of claim 1, wherein said composition has a formula selected from the group consisting of Mo.sub.12 V.sub.3 W.sub.1.2 Cu.sub.1.6 Ni.sub.1.8 O.sub.x, Mo.sub.12 V.sub.3 W.sub.1.2 Cu.sub.0.8 Ni.sub.1.6 O.sub.x, Mo.sub.12 V.sub.3 W.sub.1.2 Cu.sub.2.0 Ni.sub.0.4 O.sub.x, and Mo.sub.12 V.sub.3 W.sub.1.2 Cu.sub.2.4 Ni.sub.0.8 O.sub.x, where x is a number which is determined by the valency and occurrence of the elements in formula I other than oxygen.
- 6. The process of claim 2, wherein each of e, f, g, and h are zero.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 02 991.4 |
Feb 1993 |
DEX |
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Parent Case Info
This is a Division of application Ser. No. 08/187,494 filed on Jan. 28, 1994, now U.S. Pat. No. 5,446,004.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5177260 |
Kawajiri et al. |
Jan 1993 |
|
5198581 |
Kawajiri et al. |
Mar 1993 |
|
5218146 |
Takata et al. |
Jun 1993 |
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5264625 |
Hammon et al. |
Nov 1993 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
187494 |
Jan 1994 |
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