System and method for alcohol oxidation reaction of lignins

Patent metadata

Field	Value
Publication number	US-11123711-B2
Application number	US-201816234950-A
Country	US
Kind code	B2
Filing date	Dec 28, 2018
Priority date	Dec 28, 2017
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

The invention herein concerns a catalyst of gold particles on a layered double hydroxide (LDH) that assists in oxidation of alcohols in lignins. In some embodiments, the LDH comprises lithium and aluminum metals. Also considered are methods of using the catalyst to oxidize lignins and methods of preparing the catalyst.

First claim

We claim:

1. A system for alcohol oxidation reaction on lignins comprising a lignin-containing biomass in contact with a catalyst for lignin depolymerization including gold nanoparticles dispersed and supported_on a layered double hydroxide (LDH), wherein the gold nanoparticles are of less than 10 nm in diameter and the catalyst is under molecular oxygen.

2. The system of claim 1 , wherein the system further comprises an oxygen source for the reaction.

3. The system of claim 2 , wherein the oxygen source is air, gaseous oxygen, or hydrogen peroxide.

4. A method for oxidizing alcohols in lignin comprising contacting a lignin-containing biomass substrate with a catalyst under molecular oxygen in a reactor vessel, wherein said catalyst includes gold nanoparticles dispersed and supported_on a layered double hydroxide (LDH), wherein the gold nanoparticles are of less than 10 nm in diameter.

5. The method of claim 4 , wherein the lignin-biomass comprises an extracted lignin-containing product from a lignocellulosic biomass.

6. The method of claim 4 , wherein the lignin containing biomass comprises a lignocellulosic biomass.

7. The method of claim 4 , wherein the reactor vessel is at a temperature of between 20 and 250° C.

8. The method of claim 4 , further comprising a hydrolysis step with an acid or a base after oxidation of the lignin-biomass.

9. The method of claim 4 , wherein in the reactor vessel receives an oxygen source.

10. The method of claim 4 , wherein the reactor vessel has an O 2 partial pressure of between 0.1 and 100 atm.

11. The method of claim 4 , further comprising a solvent in the reactor vessel.

12. The method of claim 11 , wherein the solvent is selected from the group of N,N-dimethyl formamide (DMF), dimethyl acetamide (DMAC), 1,2-dimethoxyethane, 2-ethyoxyethanol, 2-methoxyethanol, diglyme, polyols, ionic liquids, diphenyl ether, water, γ-valerolactone, alcohols, pyridine, 1,4-dioxane, tetrahydrofuran, dimethyl sulfoxide (DMSO), and mixtures thereof.

13. The method of claim 4 , wherein the catalyst is in contact with the substrate for a period of between 1 minute and 72 hours.

Assignees

• Univ Kentucky Res Found

Inventors

• Crocker Mark
• Song Yang Vanessa
• Mobley Justin

Classifications

• B01J2235/00

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

• B01J35/73

  having a two-dimensional [2D] layered crystalline structure, e.g. layered double hydroxide [LDH] · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/393

  Metal or metal oxide crystallite size · CPC title