Method of preparing zinc ferrite catalyst

• US 10,456,775 B2
• Filed: 03/16/2017
• Issued: 10/29/2019
• Est. Priority Date: 03/28/2016
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Hwang, Ye Seul, Ko, Dong Hyun, Cha, Kyong Yong, Choi, Dae Heung
• Primary Examiner(s): Bos, Steven J
• Application Number:
  US15/750,806
• Publication Number:
  US 20180229221A1
• Time in Patent Office: 957 Days
• Field of Search: 423140-147, 4235941, 502329
• CPC Class Codes: B01J 23/005 Spinels
• CPC Class Codes: B01J 23/80 with zinc, cadmium or mercury
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 37/0236 Drying, e.g. preparing a suspension, adding a soluble salt and drying
• CPC Class Codes: B01J 37/031 Precipitation
• CPC Class Codes: B01J 37/04 Mixing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/08 Heat treatment B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/086 Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
• CPC Class Codes: C01G 49/0063 containing zinc
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C07C 11/167 1, 3-Butadiene
• CPC Class Codes: C07C 5/3332 with metal oxides or metal sulfides

Abstract

The present disclosure relates to a method of preparing a zinc ferrite catalyst. More particularly, the present invention relates to a method of preparing a zinc ferrite catalyst comprising a) a step of dissolving a zinc precursor and an iron (III) precursor in water to prepare an aqueous metal precursor solution; b) a step of precipitating a solid catalyst precursor while vaporizing water in the aqueous metal precursor solution; and c) a step of firing the precipitated solid catalyst precursor to prepare a zinc ferrite catalyst. In accordance with the present disclosure, the method of preparing a zinc ferrite catalyst can be simply carried out without a pH adjustment step and can secure reproducibility.

Claims

1. A method of preparing a zinc ferrite catalyst, the method comprising:

a) dissolving a zinc precursor and an iron (III) precursor in water to prepare an aqueous metal precursor solution;

b) precipitating a solid catalyst precursor by vaporizing the water in the aqueous metal precursor solution, wherein the vaporizing is carried out at 60 to 80°

C. for 2 to 4 hours using an evaporator; and

c) firing the precipitated solid catalyst precursor at a temperature from 850°

C. to 1000°

C. to prepare the zinc ferrite catalyst.

2. The method according to claim 1, wherein a mole ratio of the zinc precursor to the iron (III) precursor is 5:

1 to 1;

1.

3. The method according to claim 1, wherein the aqueous metal precursor solution comprises 0.1 to 10% by weight of the metal precursors.

4. The method according to claim 1, wherein the zinc precursor is zinc oxalate.

5. The method according to claim 1, wherein the iron (III) precursor is iron (III) oxalate.

6. The method according to claim 1, wherein the vaporizing is carried out until 80 to 99% by weight of a total amount of water in the aqueous metal precursor solution is removed.

7. The method according to claim 1, wherein the firing is carried out for 1 to 12 hours.