Claims
- 1. A process for the production of acrylic acid by a vapor phase catalytic oxidation of propane using a metal oxide catalyst comprising Mo, V, Sb and A (A represents Nb or Ta), the catalyst being obtained by a method comprising the following steps (1) and (2):(1) a step of reacting V+5 and Sb+3 at a temperature of 70° C. or higher in the presence of Mo+6 in an aqueous medium, and bubbling an oxygen-containing gas into the reaction mixture during or after the reaction; and (2) a step of adding to the reaction product obtained in step (1) a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.
- 2. A process for the production of acrylic acid by a vapor phase catalytic oxidation of propane using a metal oxide catalyst comprising Mo, V, Sb, and A (A represents Nb or Ta), the catalyst being obtained by a method comprising the following steps (3) and (4):(3) a step of reacting V+5 and Sb+3 at a temperature of 70° C. or higher in the presence of Mo+6 in an aqueous medium, and adding hydrogen peroxide to the reaction mixture during or after the reaction; and (4) a step of adding to the reaction product obtained in step (3) a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-62488 |
Mar 1999 |
JP |
|
Parent Case Info
This is a divisional of application Ser. No. 09/521,853, filed Mar. 9, 2000, the disclose of which is incorporated herein by reference.
US Referenced Citations (15)