Methods for preparing mixed-metal oxide diamondoid nanocomposites and catalytic systems including the nanocomposites

Patent metadata

Field	Value
Publication number	US-10875092-B2
Application number	US-201815966312-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	May 19, 2017
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

Methods for preparing a layered metal nanocomposite and a layered metal nanocomposite. The method includes mixing a magnesium salt and a aluminum salt to form a Mg 2+ /Al 3+ solution. The Mg/Al has a molar ratio of between 0.5:1 to 6:1. Then a diamondoid compound is added to the Mg 2+ /Al 3+ solution to form a reactant mixture. The diamondoid compound has at least one carboxylic acid moiety. The reactant mixture is heated at a reaction temperature for a reaction time to form a Mg/Al-diamondoid intercalated layered double hydroxide. The Mg/Al-diamondoid intercalated layered double hydroxide is thermally decomposed under a reducing atmosphere for a decomposition time at a decomposition temperature to form the layered metal nanocomposite.

First claim

The invention claimed is:

1. A method for preparing a layered metal nanocomposite, the method comprising:
mixing a magnesium salt and an aluminum salt to form a Mg 2+ /Al 3+ solution, in which the Mg/Al has a molar ratio of between 0.5:1 to 6:1;
adding a diamondoid compound to the Mg 2+ /Al 3+ solution to form a reactant mixture, in which the diamondoid compound has at least one carboxylic acid moiety;
heating the reactant mixture at a reaction temperature for a reaction time to form a Mg/Al-diamondoid intercalated layered double hydroxide; and
thermally decomposing the Mg/Al-diamondoid intercalated layered double hydroxide under a reducing atmosphere for a decomposition time at a decomposition temperature to form the layered metal nanocomposite.

2. The method of claim 1 , in which the aluminum salt and the diamondoid compound are mixed in amounts that provide a ratio of Al 3+ to diamondoid compound in the reactant mixture of from 0.5:1 to 2:1.

3. The method of claim 1 , in which the magnesium salt is Mg(OH) 2 .

4. The method of claim 1 , in which the aluminum salt is Al(OH) 3 .

5. The method of claim 1 , in which the magnesium salt is Mg(OH) 2 and the aluminum salt is Al(OH) 3 .

6. The method of claim 1 , in which the diamondoid compound is 1-adamantane carboxylic acid.

7. The method of claim 1 , in which the Mg 2+ /Al 3+ solution is an aqueous solution.

8. The method of claim 1 , in which the reaction temperature is from 100° C. to 180° C.

9. The method of claim 1 , in which the reaction temperature is from 140° C. to 160° C.

10. The method of claim 1 , in which the decomposition temperature is from 220° C. to 450° C.

11. The method of claim 1 , in which the decomposition temperature is from 300° C. to 450° C.

12. The method of claim 1 , in which the decomposition time is at least 4 hours.

13. The method of claim 1 , in which the reducing atmosphere comprises hydrogen gas.

14. The method of claim 1 , in which the layered metal nanocomposite comprises a layered morphology of a plurality of octahedral and tetrahedral environments.

Assignees

• Saudi Arabian Oil Co
• Univ Durham

Inventors

• Veerabhadrappa Manohara Gudiyor
• Greenwell Hugh Christopher
• Whiting Andrew
• Hall John Adrian
• Alabedi Gasan

Classifications

• B22F1/17

  Metallic particles coated with metal · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title