Study of CuO-CeO2 catalysts supported on SiO2 on the low-temperature oxidation of CO

Julián Astudillo; Gonzalo Águila; Francisco Díaz; Sichem Guerrero; Paulo Araya

doi:10.1016/j.apcata.2010.04.004

Study of CuO-CeO₂ catalysts supported on SiO₂ on the low-temperature oxidation of CO

Julián Astudillo, Gonzalo Águila, Francisco Díaz, Sichem Guerrero, Paulo Araya^*

^*Corresponding author for this work

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

35 Scopus citations

Abstract

A study was made on the effect of the Cu/Ce ratio and on the total load of both metals on the oxidation activity of CO with O₂ using SiO₂ as support. It was found that the optimum Cu/Ce ratio for a constant total load of 10% on silica (Aerosil 200) was 0.43 (w/w), which corresponded to a catalyst with 3% Cu and 7% Ce. For that ratio the highly dispersed CuO-CeO₂ interface was maximized. The catalyst's activity increased with increasing the total Cu-Ce load, but it reached a maximum above which the activity kept constant due to a similar concentration of sites at the CuO-CeO₂ interface. The higher surface area of the support led to a increase of CuO particles interacting with CeO₂ and to a decrease of bulk CuO species not interacting with CeO₂. The highly dispersed CuO-CeO₂ interface was not affected by a higher available surface area explaining the similar activity in supports with different surface area.

Original language	English
Pages (from-to)	169-176
Number of pages	8
Journal	Applied Catalysis A: General
Volume	381
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2010.04.004
State	Published - 15 Jun 2010
Externally published	Yes

Bibliographical note

Funding Information:
This work was financed under Fondecyt Project 1070961 .

Keywords

CO oxidation
CeO
CuO
SiO
Supported catalysts

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10.1016/j.apcata.2010.04.004

Cite this

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title = "Study of CuO-CeO2 catalysts supported on SiO2 on the low-temperature oxidation of CO",

abstract = "A study was made on the effect of the Cu/Ce ratio and on the total load of both metals on the oxidation activity of CO with O2 using SiO2 as support. It was found that the optimum Cu/Ce ratio for a constant total load of 10% on silica (Aerosil 200) was 0.43 (w/w), which corresponded to a catalyst with 3% Cu and 7% Ce. For that ratio the highly dispersed CuO-CeO2 interface was maximized. The catalyst's activity increased with increasing the total Cu-Ce load, but it reached a maximum above which the activity kept constant due to a similar concentration of sites at the CuO-CeO2 interface. The higher surface area of the support led to a increase of CuO particles interacting with CeO2 and to a decrease of bulk CuO species not interacting with CeO2. The highly dispersed CuO-CeO2 interface was not affected by a higher available surface area explaining the similar activity in supports with different surface area.",

keywords = "CO oxidation, CeO, CuO, SiO, Supported catalysts",

author = "Juli{\'a}n Astudillo and Gonzalo {\'A}guila and Francisco D{\'i}az and Sichem Guerrero and Paulo Araya",

note = "Funding Information: This work was financed under Fondecyt Project 1070961 .",

year = "2010",

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doi = "10.1016/j.apcata.2010.04.004",

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T1 - Study of CuO-CeO2 catalysts supported on SiO2 on the low-temperature oxidation of CO

AU - Astudillo, Julián

AU - Águila, Gonzalo

AU - Díaz, Francisco

AU - Guerrero, Sichem

AU - Araya, Paulo

N1 - Funding Information: This work was financed under Fondecyt Project 1070961 .

PY - 2010/6/15

Y1 - 2010/6/15

N2 - A study was made on the effect of the Cu/Ce ratio and on the total load of both metals on the oxidation activity of CO with O2 using SiO2 as support. It was found that the optimum Cu/Ce ratio for a constant total load of 10% on silica (Aerosil 200) was 0.43 (w/w), which corresponded to a catalyst with 3% Cu and 7% Ce. For that ratio the highly dispersed CuO-CeO2 interface was maximized. The catalyst's activity increased with increasing the total Cu-Ce load, but it reached a maximum above which the activity kept constant due to a similar concentration of sites at the CuO-CeO2 interface. The higher surface area of the support led to a increase of CuO particles interacting with CeO2 and to a decrease of bulk CuO species not interacting with CeO2. The highly dispersed CuO-CeO2 interface was not affected by a higher available surface area explaining the similar activity in supports with different surface area.

AB - A study was made on the effect of the Cu/Ce ratio and on the total load of both metals on the oxidation activity of CO with O2 using SiO2 as support. It was found that the optimum Cu/Ce ratio for a constant total load of 10% on silica (Aerosil 200) was 0.43 (w/w), which corresponded to a catalyst with 3% Cu and 7% Ce. For that ratio the highly dispersed CuO-CeO2 interface was maximized. The catalyst's activity increased with increasing the total Cu-Ce load, but it reached a maximum above which the activity kept constant due to a similar concentration of sites at the CuO-CeO2 interface. The higher surface area of the support led to a increase of CuO particles interacting with CeO2 and to a decrease of bulk CuO species not interacting with CeO2. The highly dispersed CuO-CeO2 interface was not affected by a higher available surface area explaining the similar activity in supports with different surface area.

KW - CO oxidation

KW - CeO

KW - CuO

KW - SiO

KW - Supported catalysts

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