Method for preparing ferrite metal oxide catalyst

Patent metadata

Field	Value
Publication number	US-9943831-B2
Application number	US-201514876356-A
Country	US
Kind code	B2
Filing date	Oct 6, 2015
Priority date	Jun 5, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

One aspect of the present invention provides a method for preparing a ferrite metal oxide catalyst, comprising (a) preparing a precursor solution by dissolving a magnesium nitrate precursor and an iron nitrate precursor in a polar solvent, (b) forming a catalyst powder by spray-pyrolyzing the precursor solution into a reactor using a carrier gas, and (c) calcinating the catalyst powder in a reservoir after conveying the catalyst powder to the reservoir. The method may increase the activity and stability of a catalyst powder by additionally performing a step of calcinating the catalyst powder at a certain temperature for a certain period of time, and may increase the purity of the catalyst by reducing moisture and nitrate remaining in the catalyst. Also, when using the catalyst in an oxidative dehydrogenation of n-butene, the selectivity and purity of 1,3-butadiene may increase.

First claim

What is claimed is:

1. A method for preparing a ferrite metal oxide catalyst, comprising:
(a) preparing a precursor solution by dissolving a magnesium nitrate precursor and an iron nitrate precursor in a polar solvent;
(b) forming a catalyst powder by spray-pyrolyzing the precursor solution into a reactor using a carrier gas; and
(c) calcinating the catalyst powder in a reservoir after conveying the catalyst powder to the reservoir,
wherein a pyrolysis temperature in step (b) is 700° C. to 800° C., and
wherein a calcination temperature in step (c) is 500° C. to 600° C. wherein the magnesium nitrate precursor and the iron nitrate precursor in step (a) are mixed so that a molar ratio of magnesium to iron is in the range of 1.5:1 to 2.5:1.

2. The method according to claim 1 , wherein the magnesium nitrate precursor and the iron nitrate precursor in step (a) are magnesium nitrate and iron nitrate, respectively.

3. The method according to claim 1 , wherein the polar solvent in step (a) is distilled water.

4. The method according to claim 1 , wherein the carrier gas in step (b) is air.

5. The method according to claim 4 , wherein a pressure of the air in step (b) is 2 to 4 atm.

6. The method according to claim 1 , wherein the calcination in step (c) is carried out for 1 to 4 hours.

Assignees

• Korea Kumho Petrochemical Co Ltd

Inventors

• Park Ji Won
• Kim Jae Woo
• Yun Yong Hee
• Kim Yun Jung
• Row Kyoung Ho

Classifications

• B01J37/04

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

• C07C5/48

  with oxygen as an acceptor · CPC title

• B01J37/082

  Decomposition and pyrolysis · CPC title

• C07C11/167

  1, 3-Butadiene · CPC title

• C07C2523/78

  with alkali- or alkaline earth metals or beryllium · CPC title