Catalyst, carbon dioxide reducing method, and apparatus for reducing carbon dioxide

A catalyst comprising:

• a first transition metal oxide (A1) represented by the general formula M1Ox, wherein M1 represents a transition metal element, and x represents a positive real number;
• a second transition metal oxide (A2) represented by the general formula M2Oy, wherein M2 is a transition metal element different from M1, and y is a positive real number;
• and
• a metal compound (B1) capable of adsorbing carbon dioxide, wherein
• the first transition metal oxide (A1) is supported on the metal compound (B1),
• the second transition metal oxide (A2) is supported on the metal compound (B1), and
• the first transition metal oxide (A1) is capable of generating a compound represented by the general formula M1Ox-n by reduction, wherein M1 and x are as defined above, and n represents a positive real number equal to or less than x.

A catalyst comprising:

• a first transition metal oxide (A1) represented by the general formula M1Ox, wherein M1 represents a transition metal element, and x represents a positive real number;
• a metal compound (B1) capable of adsorbing carbon dioxide;
• and
• a platinum-based compound (C1), wherein
• the first transition metal oxide (A1) is supported on the metal compound (B1), and
• the first transition metal oxide (A1) is capable of generating a compound represented by the general formula M1Ox-n by reduction, wherein M1 and x are as defined above, and n represents a positive real number equal to or less than x.

A carbon dioxide reducing method for reducing carbon dioxide using a catalyst,

• wherein a catalyst reduction reaction to reduce the catalyst and a carbon dioxide reduction reaction to reduce carbon dioxide by the catalyst are carried out, and
• wherein the catalyst comprises:
• a first transition metal oxide (A1) represented by the general formula M1Ox, wherein M1 represents a transition metal element, and x represents a positive real number;
• and
• a metal compound (B1) capable of adsorbing carbon dioxide, wherein
• the first transition metal oxide (A1) is supported on the metal compound (B1), and
• the first transition metal oxide (A1) is capable of generating a compound represented by the general formula M1Ox-n by reduction, wherein M1 and x are as defined above, and n represents a positive real number equal to or less than x.

An apparatus for reducing carbon dioxide, comprising a first reactor containing a catalyst, a carbon dioxide supplier, a hydrogen supplier, and a switching system,

• wherein the first reactor is coupled by the switching system alternately to the carbon dioxide supplier or to the hydrogen supplier, and
• wherein the catalyst comprises:
• a first transition metal oxide (A1) represented by the general formula M1Ox, wherein M1 represents a transition metal element, and x represents a positive real number;
• and
• a metal compound (B1) capable of adsorbing carbon dioxide, wherein
• the first transition metal oxide (A1) is supported on the metal compound (B1), and
• the first transition metal oxide (A1) is capable of generating a compound represented by the general formula M1Ox-n by reduction, wherein M1 and x are as defined above, and n represents a positive real number equal to or less than x.