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US 10,829,861 B2Granted
Reduction catalyst, and chemical reactor, reduction method and reduction product-producing system employing the catalyst
AssigneeKabushiki Kaisha Toshiba
InventorsJun Tamura, Satoshi Mikoshiba, Yuki Kudo, Akihiko Ono, Ryota Kitagawa, Masakazu Yamagiwa, Yoshitsune Sugano
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Abstract
The present embodiments provide a reduction catalyst realizing high reaction efficiency and a reduction reactor employing the catalyst. The reduction catalyst of the embodiment comprises an electric conductor and an organic layer having organic modifying groups placed on the surface of the conductor. The organic modifying groups have an aromatic ring having two or more nitrogen atoms. The reduction catalyst is used in a reduction reactor, and the reactor is also provided.
Claims14
A reduction catalyst, comprising:
- an electric conductor;
- and
- an organic layer having organic modifying groups placed on the surface of the conductor,
- wherein:
- the organic modifying groups have a structure represented by the following formula (B):
- Z is an imidazole group or a triazole group;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- nb is an integer of 0 to 6 inclusive;
- and
- the organic modifying groups have a density of 1×1012 to 1015 atoms/cm2.
7 more elements
A reduction catalyst, comprising:
- an electric conductor;
- and
- an organic layer having organic modifying groups placed on the surface of the conductor,
- wherein:
- the organic modifying groups have a structure represented by the following formula (A) or (B):
- each Ra is independently H or an alkyl group of C1 to C4;
- Z is an aromatic ring having two or more nitrogen atoms which are non-cationic nitrogen atoms;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- na is an integer of 1 to 5 inclusive;
- and
- nb is an integer of 0 to 6 inclusive,
- wherein:
- the electric conductor is in the form of metal fine particles;
- and
- the metal particles are loaded on a spacer layer that is made of an organic material and formed on another electric conductor on a current collector.
12 more elements
A reduction catalyst, comprising:
- an electric conductor;
- and
- an organic layer having organic modifying groups placed on the surface of the conductor,
- wherein:
- the organic modifying groups have a structure represented by the following formula (A) or (B):
- each Ra is independently H or an alkyl group of C1 to C4;
- Z is an aromatic ring having two or more nitrogen atoms which are non-cationic nitrogen atoms;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- na is an integer of 1 to 5 inclusive;
- nb is an integer of 0 to 6 inclusive;
- and
- the organic modifying groups have a density of 1×1012 to 1015 atoms/cm2;
- and
- wherein the electric conductor comprises a metal oxide selected from the group consisting of Ag2O, CuO, Ta2O5, TiO2, ZrO2, Al2O3, SiO2, ZnO, ITO, and FTO.
11 more elements
A chemical reactor comprising:
- an oxidation electrode;
- a reduction electrode provided with a reduction catalyst;
- and
- a power supply unit connected to the oxidation electrode and the reduction electrode,
- wherein said reduction catalyst comprises:
- an electric conductor;
- and
- an organic layer having organic modifying groups placed on the surface of the conductor,
- wherein:
- the organic modifying groups have a structure represented by the following formula (A) or (B):
- each Ra is independently H or an alkyl group of C1 to C4;
- Z is an aromatic ting having two or more nitrogen atoms which are non-cationic nitrogen atoms;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- na is an integer of 1 to 5 inclusive;
- and
- nb is an integer of 0 to 6 inclusive.
13 more elements
A reduction method, comprising:
- contacting an electrolyte solution with a reduction electrode provided with a reduction catalyst comprising an electric conductor and an organic layer having organic modifying groups placed on the surface of the conductor;
- and then introducing a low molecular weight-carbon compound into the electrolyte solution so as to reduce the low molecular weight-carbon compound by the action of the electrode,
- wherein:
- the organic modifying groups have a structure represented by the following formula (A) or (B):
- each Ra is independently H or an alkyl group of C1 to C4;
- Z is an aromatic ring having two or more nitrogen atoms which are non-cationic nitrogen atoms;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- na is an integer of 1 to 5 inclusive;
- b is an integer of 0 to 6 inclusive;
- and
- the organic modifying groups have a density of 1×1012 to 1015 atoms/cm2.
8 more elements
A reduction product-producing system, comprising:
- a chemical reactor comprising an oxidation electrolytic bath provided with an oxidation catalyst and a reduction electrolytic bath provided with a reduction catalyst an electric conductor and an organic layer having organic modifying groups placed on the surface of the conductor, so as to produce a reduction product by a reduction reaction of carbon dioxide;
- an electrolyte solution supply unit by which an electrolyte solution is supplied to the reduction electrolytic bath;
- a carbon dioxide supply unit by which carbon dioxide is dissolved in the electrolyte solution so as to keep the reduction reaction in the reduction electrolytic bath and thereby to increase the concentration of the reduction product in the electrolyte solution;
- and
- a separation unit by which the reduction product is separated from the electrolyte solution where the concentration of the electrolyte is increased by the carbon dioxide supply unit,
- wherein:
- the organic modifying groups have a structure represented by the following formula (A) or (B):
- each Ra is independently H or an alkyl group of C1 to C4;
- Z is an aromatic ring having two or more nitrogen atoms which are non-cationic nitrogen atoms;
- Y is a heteroatom-containing group capable of linking to the electric conductor;
- na is an integer of 1 to 5 inclusive;
- nb is an integer of 0 to 6 inclusive;
- and
- the organic modifying groups have a density of 1×1012 to 1015 atoms/cm2.
11 more elements
Dependencies are inferred from the claim text.