Claims
- 1. A process for producing a catalyst which is for use in producing acrylic acid by the gas-phase catalytic oxidation of propane and comprises a metal oxide containing metallic elements Mo, V, Sb, and A (provided that A is at least one element selected from the group consisting of Nb, Ta, Sn, W, Ti, Ni, Fe, Cr, and Co), said process comprising the following steps (1) and (2):
- step (1): reacting V.sup.+5 with Sb.sup.+3 in an aqueous medium at a temperature not lower than 70.degree. C. in the presence of Mo.sup.+6 and, during or after the reaction, bubbling either molecular oxygen or a gas containing molecular oxygen into the reaction mixture; and
- step (2): adding a compound containing the element A as a component thereof to the reaction product obtained in step (1) above, mixing the ingredients to obtain a homogeneous mixture, and calcining the resultant mixture.
- 2. The process for producing a catalyst as claimed in claim 1, wherein the metal oxide contains Mo, V, Sb, and A in a proportion represented by the following empirical formula (1):
- MoV.sub.i Sb.sub.j A.sub.k ( 1)
- wherein i, j, and k each is from 0.001 to 3.0.
- 3. The process for producing a catalyst as claimed in claim 2, wherein A is Nb or Ta; i and j each is from 0.01 to 1.5, provided that j/i is from 0.3 to 1; and k is from 0.001 to 3.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8-297755 |
Oct 1996 |
JPX |
|
9-54200 |
Feb 1997 |
JPX |
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Parent Case Info
This is a divisional of Application Ser. No. 08/955,246 filed Oct. 21, 1997, U.S. Pat. No. 5,994,580, issued Nov. 30, 1999, the disclosure of which is incorporated herein by reference.
US Referenced Citations (18)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2-180637 |
Jul 1990 |
JPX |
6-279351 |
Oct 1994 |
JPX |
7-10801 |
Jan 1995 |
JPX |
9-157241 |
Jun 1997 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
955246 |
Oct 1997 |
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