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Catalyst and method of use thereof

外国特許コード F210010550
整理番号 AF40-06WO
掲載日 2021年8月2日
出願国 欧州特許庁(EPO)
出願番号 19820465
公報番号 3808449
出願日 令和元年6月12日(2019.6.12)
公報発行日 令和3年4月21日(2021.4.21)
国際出願番号 JP2019023369
国際公開番号 WO2019240200
国際出願日 令和元年6月12日(2019.6.12)
国際公開日 令和元年12月19日(2019.12.19)
優先権データ
  • 特願2018-112139 (2018.6.12) JP
  • 2019JP23369 (2019.6.12) WO
発明の名称 (英語) Catalyst and method of use thereof
発明の概要(英語) This composite comprises: a material having electrical conductivity; and a transition metal oxide which is supported by said material. The transition metal oxide has an amorphous structure.
従来技術、競合技術の概要(英語) Background Art
In recent years, the use of renewable energy in order to reduce carbon dioxide has been studied. Since it is difficult to store renewable energy produced as electricity by solar power generation or wind power generation, a method of using hydrogen, ammonia, methylcyclohexane and the like as energy carriers has been proposed as a means of storing excess energy generated from renewable energy. In either case, it is necessary to obtain hydrogen from excess energy. As a method for efficiently obtaining hydrogen, a method is known for obtaining hydrogen from fossil fuels such as hydrocarbons by a steam reforming method or the like. However, when considering global environmental issues, it is important to obtain hydrogen by a method that does not depend on fossil resources.
As such a method, electrolysis of water is known. Similar to the steam reforming method using fossil fuels, electrolysis of water is an industrially established hydrogen production method, but with the rise of petrochemistry, the steam reforming method of hydrocarbons has been regarded as advantageous from an economic perspective. Under such circumstances, in order to industrially utilize electrolysis as a hydrogen production method, technological developments such as high temperature and high pressure water electrolysis, solid polymer electrolyte (SPE) electrolysis, and high temperature steam electrolysis are being carried out.
The voltage of the water electrolytic cell is the sum of the theoretical electrolysis voltage, the overvoltage due to the resistance of the reaction at the electrodes, and the ohmic losses due to the electrical resistance of the electrolytic solution and diaphragm. The theoretical electrolysis voltage is a voltage (1.23V) obtained from the amount of electricity for electrolysis, the required amount of electricity, the change in enthalpy, and the like. In order to lower the voltage of the water electrolytic cell, it is conceivable to reduce any of the above-described theoretical electrolysis voltage, overvoltage and ohmic losses. Of these, while the theoretical electrolysis voltage can also be obtained from calculations, the optimal value for ohmic losses can be obtained by changing the cell design, and the overvoltage can be lowered by using electrodes with high catalytic activity that have a strong ability to promote electrochemical reactions.
Patent Document 1 discloses a technique in which water is electrolyzed at an anode using an iridium oxide catalyst, the generated protons are supplied to a cathode, and carboxylic acid is hydrogenated at the cathode to produce an alcohol.
Non-Patent Document 1 discloses that when the electronic structure of an iridium oxide film obtained by electrodeposition was examined, both Ir (III) and Ir (V) oxidation states were present during the electrolysis reaction of water.
Non-Patent Document 2 describes performance evaluation as an anode of iridium oxide (T-IrO2) produced by calcination at 500°C, iridium (A-Ir) which is a metal obtained by further reducing this iridium oxide at 500°C, and E-Ir obtained by electrochemically oxidizing the same. According to the document, it has been described that Ir (III) is present in a region where the oxygen evolution reaction is occurring, Ir (III) is more abundantly present in the form of E-Ir between the T-IrO2 and E-Ir forms, the E-Ir form is amorphous and Ir atoms are highly exposed on the porous surface.
[Citation List]
[Patent Document]
[Patent Document 1] International Patent Publication No. 2017/154743 [Non-Patent Documents]
[Non-Patent Document 1] Alessandro Miguzzi, Ottavio Lugarsei, Elisabetta Achilli, Cristina Locatelli, Alberto Vetova, Paolo Ghigna and Sandra Rondinini, Chem. Scil, 2014, 5, 3591-3597
[Non-Patent Document 2] Primoz Jovanovic, Nejc Hodnik, Francisco Ruiz-Zepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Martin Sala, Vid Simon Selih, Samo Hocevar and Miran Gaberseck, J. Am, Chem. Soc., 2017 139, 12837-12846
特許請求の範囲(英語) [claim1]
1. A composite comprising:
an electrically conductive material; and
an oxide of a transition metal supported on the material,
wherein said oxide of the transition metal has an amorphous structure.

[claim2]
2. A catalyst comprising a composite,
the composite including:
an electrically conductive material; and
an oxide of a transition metal supported on the material,
wherein said oxide of the transition metal has an amorphous structure.

[claim3]
3. A structure in which a composite comprising an electrically conductive material and an oxide of a transition metal supported on the material is held on an electrically conductive base material,
wherein said transition metal is at least one of transition metals of Group 8 to Group 10 in a periodic table,
said oxide of the transition metal has an amorphous structure, and
said base material is a porous material.

[claim4]
4. An electrode catalyst in which a composite comprising an electrically conductive material and an oxide of a transition metal supported on the material is an electrode held on an electrically conductive base material,
wherein said transition metal is at least one of transition metals of Group 8 to Group 10 in a periodic table,
said oxide of the transition metal has an amorphous structure, and
said base material is a porous material.

[claim5]
5. An electrochemical reactor in which a composite comprising an electrically conductive material and an oxide of a transition metal supported on the material uses an electrode including a structure held on an electrically conductive base material as an anode.

[claim6]
6. A membrane electrode assembly comprising:
an anode including a structure in which a composite including an electrically conductive material and an oxide of a transition metal supported on the material is held on an electrically conductive base material;
a cathode; and
an electrolyte membrane provided between said anode and said cathode.

[claim7]
7. An alcohol synthesizer comprising the membrane electrode assembly according to Claim 6, and
including a first supply means for supplying water or water vapor to said anode,
a second supply means for providing carboxylic acids to said cathode, and
a means for recovering an alcohol produced at said cathode.

[claim8]
8. A method for producing a structure in which a composite comprising an electrically conductive material and an oxide of a transition metal supported on the material is held on an electrically conductive base material having a porous structure,
the method comprising a step of immersing an electrically conductive material in a solution of a precursor of an oxide of a transition metal, and heating said solution in which said material is immersed.

[claim9]
9. A method for producing an electrode catalyst in which a composite comprising an electrically conductive material and an oxide of a transition metal supported on the material is held on an electrically conductive base material having a porous structure,
the method comprising a step of applying a transition metal obtained from a transition metal obtained by treating a precursor of an oxide of a transition metal with an aqueous solution of an alkali metal or an aqueous polyhydric alcohol to a solid electrolyte membrane, and joining together a base material holding an electrically conductive material.

[claim10]
10. The method for producing an electrode catalyst according to Claim 9,
wherein said electrically conductive material is titanium oxide,
said oxide of the transition metal is iridium oxide, and
said electrically conductive base material having a porous structure is titanium.

[claim11]
11. A method for activating an electrode catalyst,
the method comprising a step of sweeping an applied voltage for one or more cycles in a range of -3.0 V to 1.5 V with respect to an onset potential, in a system of the electrode catalyst according to Claim 4 and a standard electrode provided in an electrolytic solution.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • YAMAUCHI MIHO
  • NAKASHIMA NAOTOSHI
  • KITANO SHO
  • CHENG JUNFANG
  • FUKUSHIMA TAKASHI
  • HIGASHI MANABU
国際特許分類(IPC)
指定国 Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Extension States: BA ME
参考情報 (研究プロジェクト等) CREST Creation of Innovative Core Technology for Manufacture and Use of Energy Carriers from Renewable Energy AREA
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