Gunma University

Nisshinbo Holdings Inc.

Sumitomo Electric Industries, Limited

Kawasaki Jukogyo Kabushiki Kaisha

Nihon Kanki Industry Co., Ltd.

Naokatsu Kannari

Jun-Ichi Ozaki

Jun-ichi Ozaki

Takeaki Kishimoto

Tsutomu Nishide

Naoto Saito

Rieko Kobayashi

Mayumi Mizushiri

Takayuki Takarada

Hiroki Takahashi

Takuya Takahashi

Yusuke Sudo

Yuta Horikawa

The present invention is characterized by comprising: an acid leaching step for obtaining a leach liquid by causing leaching of, by means of an acid, a metal mixture at least containing vanadium and at least one type of a divalent or trivalent metal selected from nickel, cobalt, manganese, palladium, platinum, copper, and zinc; a complex generation step for adding an ammoniacal alkaline aqueous solution to the leach liquid for adjusting the pH to 10-12 and generating, in the alkaline aqueous solution, an ammine complex of a divalent or trivalent metal ion and an anion complex of a tetravalent and/or pentavalent vanadium ion; a divalent or trivalent metal recovery step for adding a carrier having a carboxyl group to the alkaline aqueous solution in which the ammine complex and the anion complex are generated, causing the divalent or trivalent metal ion in the ammine complex to be selectively adsorbed onto the carrier, and recovering the divalent or trivalent metal ion; and a vanadium recovery step for recovering vanadium from the anion complex contained in the alkaline aqueous solution after the divalent or trivalent metal ion is recovered.

Vanadium recovery method, method for producing electrolytic solution for redox flow batteries, vanadium recovery device, and device for producing electrolytic solution for redox flow batteries

Provided are a support for supporting a metal, a metal-supported catalyst, a methanation reaction apparatus, and a method relating thereto that realize effective methanation of carbon monoxide. The support for supporting a metal includes a carbonized material obtained by carbonizing raw materials containing an organic substance and a metal, in which the support is used for supporting a metal that exhibits a catalytic activity for a methanation reaction of carbon monoxide. The metal-supported catalyst includes: a support formed of a carbonized material obtained by carbonizing raw materials containing an organic substance and a metal; and a metal that exhibits a catalytic activity for a methanation reaction of carbon monoxide, the metal being supported on the support.

Support for supporting metals, metal-supported catalyst, methanation reaction apparatus, and method relating to these

Provided is a carbon catalyst having an improved catalytic activity, a production method therefor, and an electrode and a battery which use the carbon catalyst. The carbon catalyst is obtained by carbonizing a raw material including an organic substance containing a nitrogen atom and metals, and includes iron and/or cobalt, and copper as the metals. Further, the carbon catalyst has a crystallinity of 41.0% or less, which is determined by X-ray diffractometry, a nitrogen atom-to-carbon atom ratio of 0.7 or more, which is determined by X-ray photoelectronic spectrometry, and an oxygen reduction-starting potential of 0.774 V (vs. NHE) or more.

Carbon catalyst and process for production thereof, and electrode and battery each equipped with same

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Kiryu, Japan

Naokatsu Kannari