Method for producing cellulose nanofiber carbon

Patent metadata

Field	Value
Publication number	US-11851786-B2
Application number	US-201917606562-A
Country	US
Kind code	B2
Filing date	May 13, 2019
Priority date	May 13, 2019
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A method includes a freezing process in which a solution or gel containing cellulose nanofibers is frozen to obtain a frozen component, a drying process in which the frozen component is dried in a vacuum to obtain a dry component, and a carbonizing process in which the dry component is heated and carbonized in a non-combustible atmosphere, and in the carbonizing process, the dry component is heated together with a reducing catalyst and also a material that generates a reducing gas by thermal decomposition.

First claim

The invention claimed is:

1. A method of producing cellulose nanofiber carbon, comprising:
a freezing process in which a solution or gel containing cellulose nanofibers is frozen to obtain a frozen component;
a drying process in which the frozen component is dried in a vacuum to obtain a dry component; and
a carbonizing process in which the dry component is heated and carbonized in a non-combustible atmosphere, wherein, in the carbonizing process, the dry component is heated together with a reducing catalyst,
wherein the reducing catalyst is iron powder and zinc powder, and wherein, in the carbonizing process, the dry component is heated together with the iron powder and the zinc powder.

2. The method of producing cellulose nanofiber carbon according to claim 1 , wherein, in the carbonizing process, the dry component is heated together with the iron powder and the zinc powder and a material that generates a reducing gas by thermal decomposition.

3. The method of producing cellulose nanofiber carbon according to claim 2 , wherein the material that generates a reducing gas by the thermal decomposition is sodium bicarbonate, and wherein, in the carbonizing process, the dry component is heated together with the iron powder and the zinc powder and the sodium bicarbonate.

4. A method of producing cellulose nanofiber carbon, comprising:
a freezing process in which a solution or gel containing cellulose nanofibers is frozen to obtain a frozen component;
a drying process in which the frozen component is dried in a vacuum to obtain a dry component; and
a carbonizing process in which the dry component is heated and carbonized in a non-combustible atmosphere, wherein, in the carbonizing process, the dry component is heated together with a reducing catalyst,
wherein, in the carbonizing process, the dry component is heated together with the reducing catalyst and a material that generates a reducing gas by thermal decomposition.

5. The method of producing cellulose nanofiber carbon according to claim 4 , wherein the material that generates a reducing gas by the thermal decomposition is sodium bicarbonate, and wherein, in the carbonizing process, the dry component is heated together with the reducing catalyst and the sodium bicarbonate.

6. The method of producing cellulose nanofiber carbon according to claim 4 , wherein the reducing catalyst is iron powder and zinc powder.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Minowa Hironobu
• Nohara Masaya
• Iwata Mikayo
• Sakamoto Shuhei
• Taguchi Hiroaki
• Komatsu Takeshi

Classifications

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J35/45

  Nanoparticles · CPC title

• D01F9/16 Primary

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• B01J23/80

  with zinc, cadmium or mercury · CPC title

• D01F9/324

  for manufacturing filaments from products of vegetable origin · CPC title