Oxide catalyst and method for producing same, and method for producing unsaturated nitrile

Patent metadata

Field	Value
Publication number	US-2016297753-A1
Application number	US-201515102950-A
Country	US
Kind code	A1
Filing date	Mar 4, 2015
Priority date	Mar 6, 2014
Publication date	Oct 13, 2016
Grant date	—

Abstract

There is provided a method for producing an oxide catalyst, the method including a step (a) of obtaining an aqueous mixed liquid A containing Mo, V and Sb, a step (b) of mixing a Nb raw material, water and an organic acid to obtain a Nb aqueous solution, a step (c) of mixing the Nb aqueous solution and a silica raw material to obtain an aqueous mixed liquid B, a step (d) of mixing the aqueous mixed liquid A and the aqueous mixed liquid B to obtain an aqueous mixed liquid (C), a step (e) of drying the aqueous mixed liquid C to obtain a dried powder D, and a step (f) of calcining the dried powder D to obtain the oxide catalyst.

First claim

1 . A method for producing an oxide catalyst, the method comprising:
a step (a) of obtaining an aqueous mixed liquid A comprising Mo, V and Sb; a step (b) of mixing a Nb raw material, water and an organic acid to obtain a Nb aqueous solution; a step (c) of mixing the Nb aqueous solution and a silica raw material to obtain an aqueous mixed liquid B; a step (d) of mixing the aqueous mixed liquid A and the aqueous mixed liquid B to obtain an aqueous mixed liquid C; a step (e) of drying the aqueous mixed liquid C to obtain a dried powder D; and a step (f) of calcining the dried powder D to obtain the oxide catalyst.

2 . The method for producing the oxide catalyst according to claim 1 , wherein a molar ratio (Nb/Si) of Nb to 1 mol of Si in the aqueous mixed liquid B is 0.02 to 0.7.

3 . The method for producing the oxide catalyst according to claim 1 , wherein in the step (c), a mixing time of the Nb aqueous solution and the silica raw material is 1 minute to 6 hours.

4 . The method for producing the oxide catalyst according to claim 1 , comprising, after the step (d) and before the step (e), a step (d′) of mixing the aqueous mixed liquid C and powder silica and/or silica sol.

5 . The method for producing the oxide catalyst according to claim 1 , wherein a content of silica in the oxide catalyst is 20 to 70% by mass in terms of SiO 2 .

6 . The method for producing the oxide catalyst according to claim 1 , wherein the oxide catalyst comprises a metal component represented by the following formula (1):
Mo 1 V a Sb b Nb c W d Z e O n   (1),

wherein Z is at least one element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr and Ba; a, b, c, d, e and n represent atomic ratios of each element and satisfy 0.1≦a≦0.3, 0.15≦b≦0.5, 0.01≦c≦0.5, 0≦d≦0.4, and 0≦e≦0.2, and n is a number determined by a, b, c, d and e.

7 . A method for producing an unsaturated nitrile, comprising a step of subjecting propane or isobutane to a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction with an oxide catalyst obtained by the method for producing the oxide catalyst according to claim 1 , to produce a corresponding unsaturated nitrile.

8 . An oxide catalyst, being produced by the method for producing the oxide catalyst according to claim 1 .

Assignees

• Asahi Chemical Ind

Inventors

• Ishii Yusuke
• Okada Kazushi

Classifications

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J37/0215

  Coating · CPC title

• B01J37/04 Primary

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• C07C253/24 Primary

  by ammoxidation of hydrocarbons or substituted hydrocarbons · CPC title

• B01J35/0006

  Operations & Transport · mapped topic