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Iron compound particles, method of producing iron compound particles, and oxidation catalyst using iron compound particles

A technology of iron compounds and particles, applied in the field of oxidation catalysts, to achieve the effect of excellent oxidation catalytic activity

Active Publication Date: 2017-07-25
TOYOTA CENT RES & DEV LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Ni doping improves catalytic activity, this oxidation catalyst does not always have a sufficiently high catalytic activity

Method used

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  • Iron compound particles, method of producing iron compound particles, and oxidation catalyst using iron compound particles
  • Iron compound particles, method of producing iron compound particles, and oxidation catalyst using iron compound particles
  • Iron compound particles, method of producing iron compound particles, and oxidation catalyst using iron compound particles

Examples

Experimental program
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Effect test

Embodiment 1

[0080] In a beaker, FeCl 3 ·6H 2 O (27.30g, 101mmol) and Zn (NO 3 ) 2 ·6H 2 O (1.25g, 4.20mmol) was dissolved in ion-exchanged water (500ml). Thus, a raw material aqueous solution containing metal ions (raw material solution A) having an Fe ion concentration of 0.2 mol / L was prepared. Also, in a beaker, an ethylenediamine solution (11 ml) diluted to 1 / 2 with ion-exchanged water was dissolved in ion-exchanged water (500 ml). Thus, a raw material aqueous solution (raw material solution B) containing a neutralizing agent was prepared. Raw material solutions A and B were mixed in a beaker with a magnetic stirrer using a stirring bar (rotational speed: 400 rpm) and stirred together for 30 minutes at room temperature (25° C.). Thus, a colloidal solution of an iron compound was prepared. By using a pH meter, the pH of the resulting colloid solution was measured and found to be 2.2.

Embodiment 2

[0082] The colloidal solution of iron compound was prepared in the same manner as in Example 1, except that Co(NO 3 ) 2 ·6H 2 O (1.22g, 4.19mmol) instead of Zn(NO 3 ) 2 ·6H 2 O. The pH of the obtained colloidal solution was 2.2.

Embodiment 3

[0084] The colloidal solution of iron compound is prepared in the same manner as in Example 1, except that Ni(NO 3 ) 2 ·6H 2 O (1.21g, 4.16mmol) instead of Zn(NO 3 ) 2 ·6H 2 O. The pH of the obtained colloidal solution was 2.2.

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Abstract

The invention relates to iron compound particles, a method of producing the iron compound particles, and an oxidation catalyst using the iron compound particles. The iron compound particles comprise a beta-FeOOH crystal phase and a metal element other than Fe for doping the beta-FeOOH crystal phase, wherein the metal element other than Fe is at least one metal element selected from the group consisting of : Al and transition metals of 3d and 4d other than Fe belonging to Groups 4 to 12 of the periodic table, the atomic ratio of the metal element to Fe element (metal element other than Fe / Fe element) ranges from 0.001 to 0.5, and said iron compound particles satisfy at least one of the following requirements (A) and (B): (A) the iron compound particles have a crystallite diameter of 1 to 60 nm when measured by X-ray diffraction; and (B) the iron compound particles have an average particle diameter of 1 to 600 nm as measured by dynamic light scattering in the solvent.

Description

technical field [0001] The present invention relates to iron compound particles having a β-FeOOH crystal phase, a method for producing the iron compound particles, and an oxidation catalyst using the iron compound particles. Background technique [0002] As a solution to the problems regarding the global environment and the depletion of fossil fuels, attention has been focused on hydrogen energy utilization and carbon dioxide fixation technologies. First, a water splitting reaction that splits water into hydrogen and oxygen at normal temperature and pressure, and a carbon dioxide reduction reaction that uses water as an electron source are expected as clean energy generation methods. These reactions inevitably require that water should undergo oxidation reactions: [0003] 2H 2 O→O 2 +4H + +4e - , 1.23V (relative to RHE) [0004] However, catalysts that promote the water oxidation reaction are required because the reaction efficiency is low. As such a water oxidation ...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J23/75B01J23/755B01J23/889B01J23/86B01J23/745B01J35/02C25B11/06C25B1/04
CPCC25B1/04B01J23/745B01J23/75B01J23/755B01J23/80B01J23/862B01J23/8892C25B11/077B01J35/40Y02E60/36
Inventor 毛利登美子须田明彦森川健志
Owner TOYOTA CENT RES & DEV LAB INC
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