Low-temperature route for precision synthesis of metal oxide nanoparticles
US-9517945-B2 · Dec 13, 2016 · US
Autoclave method for making ferric oxide
US12257570B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12257570-B2 |
| Application number | US-202418779745-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 22, 2024 |
| Priority date | May 30, 2018 |
| Publication date | Mar 25, 2025 |
| Grant date | Mar 25, 2025 |
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Abstract
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A thermal method of forming ferric oxide nano/microparticles with predominant morphology is described using different solvents. Methods of using the Fe 3 O 4 nano/microparticles as catalysts in the reduction of nitro compounds with sodium borohydride to the corresponding amines and decomposition of ammonium salts.
First claim
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The invention claimed is: 1. A ferric oxide synthesis method, comprising: heating a composition comprising a ferric halide and an alkali metal salt of a carboxylic acid in hexane at a temperature of 150-300° C. in a sealed container to form ferric oxide microparticles, wherein the ferric halide is selected from the group consisting of ferric chloride and ferric bromide; and contacting an ammonium salt with the ferric oxide microparticles, wherein the ferric oxide microparticles have an octahedron morphology and a particle diameter of about 4.3 μm, wherein on the contacting the ammonium salt is decomposed, and wherein the ammonium salt has a final decomposition temperature of 420° C. 2. The method of claim 1 , wherein the ferric halide is ferric chloride. 3. The method of claim 1 , wherein the alkali metal salt of a carboxylic acid is sodium acetate. 4. The method of claim 1 , wherein the heating temperature is in the range of about 195 to 205° C.
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Compounds characterised by their crystallite size · CPC title
Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title
X-ray diffraction · CPC title
Scanning electron microscopy; Transmission electron microscopy · CPC title
Cylinders or rings · CPC title
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- What does patent US12257570B2 cover?
- A thermal method of forming ferric oxide nano/microparticles with predominant morphology is described using different solvents. Methods of using the Fe 3 O 4 nano/microparticles as catalysts in the reduction of nitro compounds with sodium borohydride to the corresponding amines and decomposition of ammonium salts.
- Who is the assignee on this patent?
- Univ King Fahd Pet & Minerals
- What technology area does this patent fall under?
- Primary CPC classification C01G49/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 25 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).