TiO2 溶融塩電解還元時のガス発生反応

Yasushi Haraguchi; Ryota Shibuya; Shungo Natsui; Tatsuya Kikuchi; Ryosuke O. Suzuki

doi:10.2320/jinstmet.JAW201901

TiO₂ 溶融塩電解還元時のガス発生反応

Translated title of the contribution: Gas generation reactions during TiO₂ reduction using molten salt

Yasushi Haraguchi, Ryota Shibuya, Shungo Natsui, Tatsuya Kikuchi, Ryosuke O. Suzuki

Division of Process and System Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Titanium dioxides were reduced to metallic titanium via molten salt electrolysis using CaCl₂. It was reported that the efficiency was low because some side reactions produced carbon precipitates. To produce titanium more efficiently, these electrochemical side reactions were examined by cyclic voltammetry（CV）. O^2- reacted with the carbon anode to form CO and CO₂ gas bubbles, which easily dissolved into the molten salt and formed CO₃ ^2-, subsequently generating carbon powder. CV was performed after interrupting electrolysis temporarily. The electrochemical reduction of CO₃ ^2- in the cathodic scan was not observed, suggesting that CO₃ ^2- was spontaneously reduced by Ca during electrolysis. Anodic reactions preceding Cl₂ gas generation occurred in three steps: CO and CO₂ gas generation related to O^2-, and successive CO₂ generation related to CO₃ ^2-

Translated title of the contribution	Gas generation reactions during TiO₂ reduction using molten salt
Original language	Japanese
Pages (from-to)	441-448
Number of pages	8
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	83
Issue number	11
DOIs	https://doi.org/10.2320/jinstmet.JAW201901
Publication status	Published - 2019

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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title = "TiO2 溶融塩電解還元時のガス発生反応",

abstract = "Titanium dioxides were reduced to metallic titanium via molten salt electrolysis using CaCl2. It was reported that the efficiency was low because some side reactions produced carbon precipitates. To produce titanium more efficiently, these electrochemical side reactions were examined by cyclic voltammetry（CV）. O2- reacted with the carbon anode to form CO and CO2 gas bubbles, which easily dissolved into the molten salt and formed CO3 2-, subsequently generating carbon powder. CV was performed after interrupting electrolysis temporarily. The electrochemical reduction of CO3 2- in the cathodic scan was not observed, suggesting that CO3 2- was spontaneously reduced by Ca during electrolysis. Anodic reactions preceding Cl2 gas generation occurred in three steps: CO and CO2 gas generation related to O2-, and successive CO2 generation related to CO3 2- ",

keywords = "Calcium chloride, Carbonate ion, Cyclic voltammetry, Gas evolution, Molten salt, Titanium dioxide",

author = "Yasushi Haraguchi and Ryota Shibuya and Shungo Natsui and Tatsuya Kikuchi and Suzuki, {Ryosuke O.}",

year = "2019",

doi = "10.2320/jinstmet.JAW201901",

language = "Japanese",

volume = "83",

pages = "441--448",

journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",

issn = "0021-4876",

publisher = "Japan Institute of Metals (JIM)",

number = "11",

}

TY - JOUR

T1 - TiO2 溶融塩電解還元時のガス発生反応

AU - Haraguchi, Yasushi

AU - Shibuya, Ryota

AU - Natsui, Shungo

AU - Kikuchi, Tatsuya

AU - Suzuki, Ryosuke O.

PY - 2019

Y1 - 2019

N2 - Titanium dioxides were reduced to metallic titanium via molten salt electrolysis using CaCl2. It was reported that the efficiency was low because some side reactions produced carbon precipitates. To produce titanium more efficiently, these electrochemical side reactions were examined by cyclic voltammetry（CV）. O2- reacted with the carbon anode to form CO and CO2 gas bubbles, which easily dissolved into the molten salt and formed CO3 2-, subsequently generating carbon powder. CV was performed after interrupting electrolysis temporarily. The electrochemical reduction of CO3 2- in the cathodic scan was not observed, suggesting that CO3 2- was spontaneously reduced by Ca during electrolysis. Anodic reactions preceding Cl2 gas generation occurred in three steps: CO and CO2 gas generation related to O2-, and successive CO2 generation related to CO3 2-

AB - Titanium dioxides were reduced to metallic titanium via molten salt electrolysis using CaCl2. It was reported that the efficiency was low because some side reactions produced carbon precipitates. To produce titanium more efficiently, these electrochemical side reactions were examined by cyclic voltammetry（CV）. O2- reacted with the carbon anode to form CO and CO2 gas bubbles, which easily dissolved into the molten salt and formed CO3 2-, subsequently generating carbon powder. CV was performed after interrupting electrolysis temporarily. The electrochemical reduction of CO3 2- in the cathodic scan was not observed, suggesting that CO3 2- was spontaneously reduced by Ca during electrolysis. Anodic reactions preceding Cl2 gas generation occurred in three steps: CO and CO2 gas generation related to O2-, and successive CO2 generation related to CO3 2-

KW - Calcium chloride

KW - Carbonate ion

KW - Cyclic voltammetry

KW - Gas evolution

KW - Molten salt

KW - Titanium dioxide

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DO - 10.2320/jinstmet.JAW201901

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VL - 83

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EP - 448

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 11