Catalysts for thermochemical fuel production and method of producing fuel using thermochemical fuel production

Patent metadata

Field	Value
Publication number	US-9873109-B2
Application number	US-201514595130-A
Country	US
Kind code	B2
Filing date	Jan 12, 2015
Priority date	Mar 23, 2012
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

To provide a catalyst, which is formed from a perovskite oxide, for thermochemical fuel production, and a method of producing fuel using thermochemical fuel production that is capable of allowing a fuel to be produced in a thermochemical manner. Provided is a catalyst for thermochemical fuel production, which is used for producing the fuel from thermal energy by using a two-step thermochemical cycle of a first temperature and a second temperature that is equal to or lower than the first temperature, wherein the catalyst is formed from a perovskite oxide having a compositional formula of AXO 3±δ (provided that, 0≦δ≦1). Here, A represents one or more of a rare-earth element (excluding Ce), an alkaline earth metal element, and an alkali metal element, X represents one or more of a transition metal element and a metalloid element, and O represents oxygen.

First claim

The invention claimed is:

1. A method of producing fuel, the method comprising:
a process of heating a perovskite oxide having a compositional formula of AXO 3±δ (provided that, 0≦δ<1) to a first temperature to reduce the perovskite oxide; and
a process of bringing carbon dioxide and/or water vapor that is a raw material gas into contact with the reduced perovskite oxide and oxidizing the perovskite oxide to produce the fuel, at a second temperature,
wherein the method produces the fuel from thermal energy by providing a two-step thermochemical cycle of the first temperature and the second temperature, wherein the second temperature is equal to or lower than the first temperature,
in the perovskite oxide the element A is La, the element X is Mn, wherein La is partially substituted with Sr, and Mn is partially substituted with Fe; and
each atom of Mn is partially substituted with 0.35 to 0.85 atoms of Fe.

2. The method of producing fuel using thermochemical fuel production according to claim 1 ,
wherein the fuel is any one of hydrogen, methane, and methanol.

3. The method of producing fuel using thermochemical fuel production according to claim 1 ,
wherein the raw material gas includes water vapor.

4. The method of producing fuel using thermochemical fuel production according to claim 1 ,
wherein the raw material gas includes carbon dioxide and water vapor.

Assignees

• Japan Science & Tech Agency
• California Inst Of Techn

Inventors

• Yamazaki Yoshihiro
• Haile Sossina M
• Yang Chih-Kai

Classifications

• B01J23/34 Primary

  Manganese · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/733

  Perovskite-type · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title