Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation

Jun Fukushima; Hirotsugu Takizawa

doi:10.1016/j.matchemphys.2015.12.057

Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation

Jun Fukushima, Hirotsugu Takizawa

ENG - Applied Chemistry

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

12 Citations (Scopus)

Abstract

The reduction behavior of copper (II) oxide (CuO) covered with boron nitride (BN) powder under microwave H-field irradiation was investigated to understand the mechanism of enhanced reduction of CuO in microwave processing. Internal heating using microwave irradiation resulted in a unidirectional diffusion of oxygen from inside the CuO pellet to its outside, and selective heating prevented the oxidization of the BN powder near the CuO pellet. A quantum chemical interpretation of this phenomenon revealed that the microwave H-field couples to the Fermi level electrons of CuO, and the copper-oxygen bond may be cleaved by both microwave energy and thermal energy. As a result, microwave H-field irradiation resulted in a more effective reduction of CuO to copper metal compared to conventional heating.

Original language	English
Pages (from-to)	47-53
Number of pages	7
Journal	Materials Chemistry and Physics
Volume	172
DOIs	https://doi.org/10.1016/j.matchemphys.2015.12.057
Publication status	Published - 2016 Apr 1

Keywords

Band-structure
Copper oxide
Oxides
Powder diffraction
Powder metallurgy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.matchemphys.2015.12.057

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title = "Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation",

abstract = "The reduction behavior of copper (II) oxide (CuO) covered with boron nitride (BN) powder under microwave H-field irradiation was investigated to understand the mechanism of enhanced reduction of CuO in microwave processing. Internal heating using microwave irradiation resulted in a unidirectional diffusion of oxygen from inside the CuO pellet to its outside, and selective heating prevented the oxidization of the BN powder near the CuO pellet. A quantum chemical interpretation of this phenomenon revealed that the microwave H-field couples to the Fermi level electrons of CuO, and the copper-oxygen bond may be cleaved by both microwave energy and thermal energy. As a result, microwave H-field irradiation resulted in a more effective reduction of CuO to copper metal compared to conventional heating.",

keywords = "Band-structure, Copper oxide, Oxides, Powder diffraction, Powder metallurgy",

author = "Jun Fukushima and Hirotsugu Takizawa",

year = "2016",

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doi = "10.1016/j.matchemphys.2015.12.057",

language = "English",

volume = "172",

pages = "47--53",

journal = "Materials Chemistry and Physics",

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TY - JOUR

T1 - Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation

AU - Fukushima, Jun

AU - Takizawa, Hirotsugu

PY - 2016/4/1

Y1 - 2016/4/1

N2 - The reduction behavior of copper (II) oxide (CuO) covered with boron nitride (BN) powder under microwave H-field irradiation was investigated to understand the mechanism of enhanced reduction of CuO in microwave processing. Internal heating using microwave irradiation resulted in a unidirectional diffusion of oxygen from inside the CuO pellet to its outside, and selective heating prevented the oxidization of the BN powder near the CuO pellet. A quantum chemical interpretation of this phenomenon revealed that the microwave H-field couples to the Fermi level electrons of CuO, and the copper-oxygen bond may be cleaved by both microwave energy and thermal energy. As a result, microwave H-field irradiation resulted in a more effective reduction of CuO to copper metal compared to conventional heating.

AB - The reduction behavior of copper (II) oxide (CuO) covered with boron nitride (BN) powder under microwave H-field irradiation was investigated to understand the mechanism of enhanced reduction of CuO in microwave processing. Internal heating using microwave irradiation resulted in a unidirectional diffusion of oxygen from inside the CuO pellet to its outside, and selective heating prevented the oxidization of the BN powder near the CuO pellet. A quantum chemical interpretation of this phenomenon revealed that the microwave H-field couples to the Fermi level electrons of CuO, and the copper-oxygen bond may be cleaved by both microwave energy and thermal energy. As a result, microwave H-field irradiation resulted in a more effective reduction of CuO to copper metal compared to conventional heating.

KW - Band-structure

KW - Copper oxide

KW - Oxides

KW - Powder diffraction

KW - Powder metallurgy

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DO - 10.1016/j.matchemphys.2015.12.057

M3 - Article

AN - SCOPUS:84960443619

SN - 0254-0584

VL - 172

SP - 47

EP - 53

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

ER -

Enhanced reduction of copper oxides via internal heating, selective heating, and cleavage of Cu-O bond by microwave magnetic-field irradiation

Abstract

Keywords

ASJC Scopus subject areas

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