Effects of Cu oxidation states on the catalysis of NO+CO and N2O+CO reactions

Hirone Iwamoto; Satoshi Kameoka; Ya Xu; Chikashi Nishimura; Ampo Sai

doi:10.1016/j.jpcs.2018.10.013

Effects of Cu oxidation states on the catalysis of NO+CO and N₂O+CO reactions

Hirone Iwamoto, Satoshi Kameoka, Ya Xu, Chikashi Nishimura, Ampo Sai

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

12 Citations (Scopus)

Abstract

The relationship between the oxidation state of bulk Cu and catalytic activity during the NO + CO and N₂O + CO reactions were investigated, using commercially available Cu, Cu₂O and CuO powders. Metallic Cu powder was found to catalyze both reactions in a stable manner without changing its oxidation state. At elevated temperatures, the catalytic activities of the Cu₂O and CuO increased with time, in conjunction with reduction by CO to metallic Cu in both cases. The data confirm that metallic Cu exhibits much high activity and stability than either Cu₂O or CuO for both the NO + CO and N₂O + CO reactions. In addition, Cu₂O species (denoted as Cu₂O*) formed via oxidation of metallic Cu species obtained by reduction of CuO with CO at low temperature (<300 °C) showed catalytic activity during both reactions as a result of the high surface area and structural disorder of this material.

Original language	English
Pages (from-to)	64-73
Number of pages	10
Journal	Journal of Physics and Chemistry of Solids
Volume	125
DOIs	https://doi.org/10.1016/j.jpcs.2018.10.013
Publication status	Published - 2019 Feb

Keywords

Cu
CuO
CuO
NO + CO reaction
NO + CO reaction

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.jpcs.2018.10.013

Cite this

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title = "Effects of Cu oxidation states on the catalysis of NO+CO and N2O+CO reactions",

abstract = "The relationship between the oxidation state of bulk Cu and catalytic activity during the NO + CO and N2O + CO reactions were investigated, using commercially available Cu, Cu2O and CuO powders. Metallic Cu powder was found to catalyze both reactions in a stable manner without changing its oxidation state. At elevated temperatures, the catalytic activities of the Cu2O and CuO increased with time, in conjunction with reduction by CO to metallic Cu in both cases. The data confirm that metallic Cu exhibits much high activity and stability than either Cu2O or CuO for both the NO + CO and N2O + CO reactions. In addition, Cu2O species (denoted as Cu2O*) formed via oxidation of metallic Cu species obtained by reduction of CuO with CO at low temperature (<300 °C) showed catalytic activity during both reactions as a result of the high surface area and structural disorder of this material.",

keywords = "Cu, CuO, CuO, NO + CO reaction, NO + CO reaction",

author = "Hirone Iwamoto and Satoshi Kameoka and Ya Xu and Chikashi Nishimura and Ampo Sai",

note = "Funding Information: This work was supported in part by Grant-in-Aid for Scientific Research ((A) 15H02299 , (B) 18H01783 ) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) . Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2019",

month = feb,

doi = "10.1016/j.jpcs.2018.10.013",

language = "English",

volume = "125",

pages = "64--73",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

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TY - JOUR

T1 - Effects of Cu oxidation states on the catalysis of NO+CO and N2O+CO reactions

AU - Iwamoto, Hirone

AU - Kameoka, Satoshi

AU - Xu, Ya

AU - Nishimura, Chikashi

AU - Sai, Ampo

N1 - Funding Information: This work was supported in part by Grant-in-Aid for Scientific Research ((A) 15H02299 , (B) 18H01783 ) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) . Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/2

Y1 - 2019/2

N2 - The relationship between the oxidation state of bulk Cu and catalytic activity during the NO + CO and N2O + CO reactions were investigated, using commercially available Cu, Cu2O and CuO powders. Metallic Cu powder was found to catalyze both reactions in a stable manner without changing its oxidation state. At elevated temperatures, the catalytic activities of the Cu2O and CuO increased with time, in conjunction with reduction by CO to metallic Cu in both cases. The data confirm that metallic Cu exhibits much high activity and stability than either Cu2O or CuO for both the NO + CO and N2O + CO reactions. In addition, Cu2O species (denoted as Cu2O*) formed via oxidation of metallic Cu species obtained by reduction of CuO with CO at low temperature (<300 °C) showed catalytic activity during both reactions as a result of the high surface area and structural disorder of this material.

AB - The relationship between the oxidation state of bulk Cu and catalytic activity during the NO + CO and N2O + CO reactions were investigated, using commercially available Cu, Cu2O and CuO powders. Metallic Cu powder was found to catalyze both reactions in a stable manner without changing its oxidation state. At elevated temperatures, the catalytic activities of the Cu2O and CuO increased with time, in conjunction with reduction by CO to metallic Cu in both cases. The data confirm that metallic Cu exhibits much high activity and stability than either Cu2O or CuO for both the NO + CO and N2O + CO reactions. In addition, Cu2O species (denoted as Cu2O*) formed via oxidation of metallic Cu species obtained by reduction of CuO with CO at low temperature (<300 °C) showed catalytic activity during both reactions as a result of the high surface area and structural disorder of this material.

KW - Cu

KW - CuO

KW - NO + CO reaction

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