Nanostructured iron/carbon for scavenging oxygen

Patent metadata

Field	Value
Publication number	US-11134707-B2
Application number	US-201615576696-A
Country	US
Kind code	B2
Filing date	May 23, 2016
Priority date	May 22, 2015
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

The invention is directed to a nanostructured composite material comprising a mixture of at least one metal particle such as iron and a carbon material from biomass such as D-glucose, D-glucosamine hydrochloride or a-cyclodextrin. The invention is also directed to a composition comprising the composite material comprising the composite material and an inorganic salt, and a method for synthesizing the composite material comprising immersing the carbon material into a solution of metal ions, drying the impregnated carbon particle and subjecting the impregnated carbon particle to a carbothermal reduction process. The nanostructured composite material is useful as an oxygen scavenging layer in a multi-layer film which comprises the oxygen scavenging layer and an oxygen barrier layer that retards the permeation of oxygen from an external environment.

First claim

What is claimed is:

1. A method of synthesizing a composite material comprising at least one metal particle and a carbon material, comprising:
i. subjecting a dissolved biomass material to a one-step hydrothermal treatment process to form at least one porous carbon particle having a layer of saccharides containing hydroxyl and/or carboxylic acid groups thereon;
ii. immersing said at least one porous carbon particle of operation (i) into a solution of metal ions to allow said metal ions to impregnate into the pores of the carbon particle;
iii. drying the impregnated carbon particle; and
iv. subjecting the impregnated carbon particle to a carbothermal reduction process at conditions to thereby synthesize said composite material,
wherein said biomass material is selected from a saccharide wherein the saccharide is selected from a monosaccharide, disaccharide, oligosaccharide or a polysaccharide; wherein the monosaccharide is selected from the group consisting of glucose, fructose and galactose; wherein the oligosaccharide is selected from the group consisting of a sugar or an amino sugar; or wherein the polysaccharide is selected from the group consisting of a cyclodextrin, a cellulose, a glycogen, a chitin and a hemicellulose, and wherein said carbon material is a carbon particle or a sheet-like material having a porous structure with a pore size in the range of 10 to 700 nm.

2. The method of claim 1 , wherein the solution of metal ions is derived from a metal salt selected from the group consisting of metal nitrate, metal chloride, metal sulfate, metal gluconate, metal citrate and metal oxalate.

3. The method of claim 1 , wherein said immersing step is undertaken for a period of time in the range of 30 minutes to 24 hours.

4. The method of claim 1 , wherein said subjecting step is undertaken at a temperature in the range of 700 to 1000° C. or in an inert gas environment.

Assignees

• Agency Science Tech & Res
• Nat Univ Singapore

Inventors

• Li Xu
• Chieng Yu Yuan
• Wong Siew Yee
• Wang Suxi
• Huang Jen-Yi
• Zhou Weibiao

Classifications

• A23B2/717 Primary

  Oxygen absorbent · CPC title

• B01J20/28061

  being in the range 100-500 m2/g · CPC title

• B01J20/3204

  Inorganic carriers, supports or substrates · CPC title

• B01J20/0229

  Compounds of Fe · CPC title

• B01J20/28083

  being in the range 2-50 nm, i.e. mesopores · CPC title