Photochemical reaction system

Patent metadata

Field	Value
Publication number	US-10844495-B2
Application number	US-201715697956-A
Country	US
Kind code	B2
Filing date	Sep 7, 2017
Priority date	Nov 20, 2012
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

According to one embodiment, a photochemical reaction system comprises a CO2 production unit, a CO2 absorption unit, and a CO2 reduction unit. The CO2 reduction unit comprises a laminated body and an ion transfer pathway. The laminated body comprises an oxidation catalyst layer producing O2 and H+ by oxidizing H2O, a reduction catalyst layer producing carbon compounds by reducing CO2 absorbed by the CO2 absorption unit, and a semiconductor layer formed between the oxidation catalyst layer and the reduction catalyst layer and develops charge separation with light energy. The ion transfer pathways make ions move between the oxidation catalyst layer side and the reduction catalyst layer side.

First claim

What is claimed is:

1. A chemical reaction system, comprising:
a CO 2 reduction unit comprising: an oxidation catalyst layer producing O 2 and H + by oxidizing H 2 O; a reduction catalyst layer producing carbon compounds by reducing CO 2 ; and an ion transfer pathway making ions to move between the oxidation catalyst layer and the reduction catalyst layer;
a CO 2 release unit which forms CO 2 by decomposing a CO 2 absorbent which has absorbed CO 2 and makes the decomposed CO 2 absorbent flow out to the CO 2 reduction unit; and
a CO 2 storage unit storing the CO 2 decomposed by the CO 2 release unit.

2. The system of claim 1 , wherein the CO 2 storage unit supplies the stored CO 2 to the CO 2 reduction unit.

3. The system of claim 1 , wherein the decomposed CO 2 absorbent comprises CO 2 , and the CO 2 reduction unit reduces the CO 2 contained in the decomposed CO 2 absorbent.

Assignees

• Toshiba Kk

Inventors

• Ono Akihiko
• Mikoshiba Satoshi
• Kudo Yuki
• Tamura Jun
• Kitagawa Ryota
• Huang Chingchun

Classifications

• H10F10/172 Primary

  comprising multiple PIN junctions, e.g. tandem cells · CPC title

• C25B9/19

  with diaphragms · CPC title

• C25B1/55

  Photoelectrolysis · CPC title

• C25B3/25 Primary

  Reduction · CPC title

• C25B9/17

  Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof · CPC title