Influence of calcination temperature on the structure and catalytic performance of CuOx-CoOy-CeO2 ternary mixed oxide for CO oxidation

Zhi Gang Liu; Song Hai Chai; Andrew Binder; Yuan Yuan Li; Lin Tao Ji; Sheng Dai

doi:10.1016/j.apcata.2012.10.023

Influence of calcination temperature on the structure and catalytic performance of CuO_x-CoO_y-CeO₂ ternary mixed oxide for CO oxidation

Zhi Gang Liu, Song Hai Chai, Andrew Binder, Yuan Yuan Li, Lin Tao Ji, Sheng Dai

Chemical Sciences Division

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

50 Scopus citations

Abstract

Influence of calcination temperature (400-800 °C) on the structure and catalytic activity of CuO_x-CoO_y-CeO₂ ternary mixed oxide (atomic Cu:Co:Ce ratio of 1:5:5) prepared by co-precipitation method is investigated by N₂ physisorption, XRD, TPR, TEM, TG-DTA, XPS, and CO oxidation reaction. The as-synthesized CuO_x-CoO _y-CeO₂ undergoes successive structural changes with the calcination temperature, involving the hydroxide dehydration below 400 °C, enhanced interaction between Co₃O₄ and CeO₂ at ca. 600 °C, and Co₃O₄ decomposition to CoO at 700 °C. The catalyst calcined at 600 °C shows a relative enrichment of Cu⁺ on the surface of CuO_x-CoO_y-CeO₂ and an enhanced interaction between Co₃O₄ and CeO ₂ along with the appearance of oxygen vacancies in CeO₂, which seems to be responsible for its highest catalytic activity for CO oxidation among all the tested catalysts. The complete conversion of CO is obtained at 70 °C and about 50% of CO conversion is reached at 55 °C.

Original language	English
Pages (from-to)	282-288
Number of pages	7
Journal	Applied Catalysis A: General
Volume	451
DOIs	https://doi.org/10.1016/j.apcata.2012.10.023
State	Published - Jan 31 2013

Funding

This research is sponsored by the Division of Chemical Science, Office of Basic Energy Sciences, U.S. Department of Energy. The research (ZL, YL, LJ) is also supported partly by the Heavy Oil State Key Laboratory in China.

Keywords

Calcination temperature
CuO-CoO-CeO
Mechanism
Mutual interaction, CO oxidation

Access to Document

10.1016/j.apcata.2012.10.023

Cite this

@article{4996b9ec24b148dbaf9d3bd24010816d,

title = "Influence of calcination temperature on the structure and catalytic performance of CuOx-CoOy-CeO2 ternary mixed oxide for CO oxidation",

abstract = "Influence of calcination temperature (400-800 °C) on the structure and catalytic activity of CuOx-CoOy-CeO2 ternary mixed oxide (atomic Cu:Co:Ce ratio of 1:5:5) prepared by co-precipitation method is investigated by N2 physisorption, XRD, TPR, TEM, TG-DTA, XPS, and CO oxidation reaction. The as-synthesized CuOx-CoO y-CeO2 undergoes successive structural changes with the calcination temperature, involving the hydroxide dehydration below 400 °C, enhanced interaction between Co3O4 and CeO2 at ca. 600 °C, and Co3O4 decomposition to CoO at 700 °C. The catalyst calcined at 600 °C shows a relative enrichment of Cu+ on the surface of CuOx-CoOy-CeO2 and an enhanced interaction between Co3O4 and CeO 2 along with the appearance of oxygen vacancies in CeO2, which seems to be responsible for its highest catalytic activity for CO oxidation among all the tested catalysts. The complete conversion of CO is obtained at 70 °C and about 50% of CO conversion is reached at 55 °C.",

keywords = "Calcination temperature, CuO-CoO-CeO, Mechanism, Mutual interaction, CO oxidation",

author = "Liu, {Zhi Gang} and Chai, {Song Hai} and Andrew Binder and Li, {Yuan Yuan} and Ji, {Lin Tao} and Sheng Dai",

year = "2013",

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AU - Liu, Zhi Gang

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AU - Binder, Andrew

AU - Li, Yuan Yuan

AU - Ji, Lin Tao

AU - Dai, Sheng

PY - 2013/1/31

Y1 - 2013/1/31

N2 - Influence of calcination temperature (400-800 °C) on the structure and catalytic activity of CuOx-CoOy-CeO2 ternary mixed oxide (atomic Cu:Co:Ce ratio of 1:5:5) prepared by co-precipitation method is investigated by N2 physisorption, XRD, TPR, TEM, TG-DTA, XPS, and CO oxidation reaction. The as-synthesized CuOx-CoO y-CeO2 undergoes successive structural changes with the calcination temperature, involving the hydroxide dehydration below 400 °C, enhanced interaction between Co3O4 and CeO2 at ca. 600 °C, and Co3O4 decomposition to CoO at 700 °C. The catalyst calcined at 600 °C shows a relative enrichment of Cu+ on the surface of CuOx-CoOy-CeO2 and an enhanced interaction between Co3O4 and CeO 2 along with the appearance of oxygen vacancies in CeO2, which seems to be responsible for its highest catalytic activity for CO oxidation among all the tested catalysts. The complete conversion of CO is obtained at 70 °C and about 50% of CO conversion is reached at 55 °C.

AB - Influence of calcination temperature (400-800 °C) on the structure and catalytic activity of CuOx-CoOy-CeO2 ternary mixed oxide (atomic Cu:Co:Ce ratio of 1:5:5) prepared by co-precipitation method is investigated by N2 physisorption, XRD, TPR, TEM, TG-DTA, XPS, and CO oxidation reaction. The as-synthesized CuOx-CoO y-CeO2 undergoes successive structural changes with the calcination temperature, involving the hydroxide dehydration below 400 °C, enhanced interaction between Co3O4 and CeO2 at ca. 600 °C, and Co3O4 decomposition to CoO at 700 °C. The catalyst calcined at 600 °C shows a relative enrichment of Cu+ on the surface of CuOx-CoOy-CeO2 and an enhanced interaction between Co3O4 and CeO 2 along with the appearance of oxygen vacancies in CeO2, which seems to be responsible for its highest catalytic activity for CO oxidation among all the tested catalysts. The complete conversion of CO is obtained at 70 °C and about 50% of CO conversion is reached at 55 °C.

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