Carbon Dioxide Gas Phase Reduction Device and Carbon Dioxide Gas Phase Reduction Method

Patent metadata

Field	Value
Publication number	US-2023135736-A1
Application number	US-202017914028-A
Country	US
Kind code	A1
Filing date	May 11, 2020
Priority date	May 11, 2020
Publication date	May 4, 2023
Grant date	—

Abstract

A gas-phase reduction device for carbon dioxide includes: an oxidation chamber containing an oxidation electrode; a reduction chamber to which carbon dioxide is supplied; a gas reduction sheet that has an ion exchange membrane and a reduction electrode laminated together therein and that is disposed between the oxidation chamber and the reduction chamber with the ion exchange membrane facing the oxidation chamber and the reduction electrode facing the reduction chamber; a conducting wire that connects the oxidation electrode and the reduction electrode; and a heat source that surrounds the reduction chamber.

First claim

1 . A gas-phase reduction device for carbon dioxide, comprising:
an oxidation chamber containing an oxidation electrode; a reduction chamber to which carbon dioxide is supplied; a gas reduction sheet that has an ion exchange membrane and a reduction electrode laminated together therein and that is disposed between the oxidation chamber and the reduction chamber with the ion exchange membrane facing the oxidation chamber and the reduction electrode facing the reduction chamber; a conducting wire that connects the oxidation electrode and the reduction electrode; and a heat source that surrounds the reduction chamber.

2 . The gas-phase reduction device for carbon dioxide according to claim 1 , further comprising a light source that irradiates the oxidation electrode with light.

3 . The gas-phase reduction device for carbon dioxide according to claim 1 , further comprising a power supply that is connected to the conducting wire.

4 . The gas-phase reduction device for carbon dioxide according to claim 1 , wherein the oxidation electrode is an n-type semiconductor.

5 . The gas-phase reduction device for carbon dioxide according to claim 1 , further comprising a heat conductive plate and a heat insulator that surround the reduction chamber.

6 . A gas-phase reduction method for carbon dioxide performed in a gas-phase reduction device for carbon dioxide,
the gas-phase reduction device for carbon dioxide comprising: an oxidation chamber containing an oxidation electrode; a reduction chamber to which carbon dioxide is supplied; a gas reduction sheet that has an ion exchange membrane and a reduction electrode laminated together therein and that is disposed between the oxidation chamber and the reduction chamber with the ion exchange membrane facing the oxidation chamber and the reduction electrode facing the reduction chamber; a conducting wire that connects the oxidation electrode and the reduction electrode; and a heat source that surrounds the reduction chamber, and executing: a first step of pouring an electrolytic solution into the oxidation chamber; a second step of applying heat to the reduction chamber; a third step of flowing the carbon dioxide into the reduction chamber; and a fourth step of irradiating the oxidation electrode with light or applying a voltage between the oxidation electrode and the reduction electrode.

7 . The gas-phase reduction method for carbon dioxide according to claim 6 , wherein, in the second step, heat is applied that has a temperature higher than boiling points of liquids to be produced on a surface of the reduction electrode by reduction reactions of the carbon dioxide induced on the surface of the reduction electrode.

8 . The gas-phase reduction device for carbon dioxide according to claim 2 , wherein the oxidation electrode is an n-type semiconductor.

9 . The gas-phase reduction device for carbon dioxide according to claim 2 , further comprising a heat conductive plate and a heat insulator that surround the reduction chamber.

10 . The gas-phase reduction device for carbon dioxide according to claim 3 , further comprising a heat conductive plate and a heat insulator that surround the reduction chamber.

11 . The gas-phase reduction device for carbon dioxide according to claim 4 , further comprising a heat conductive plate and a heat insulator that surround the reduction chamber.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Sato Sayumi
• Uzumaki Yuya
• Ono Yoko
• Komatsu Takeshi

Classifications

• C25B3/26

  of carbon dioxide · CPC title

• C25B9/65

  Means for supplying current; Electrode connections; Electric inter-cell connections · CPC title

• C25B9/67

  Heating or cooling means · CPC title

• C25B3/21 Primary

  Photoelectrolysis · CPC title

• C25B9/23 Primary

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title