Study of Na/Cu/TiO 2 catalysts for the storage and reduction of NO

Sichem Guerrero; Igor Guzmán; Gonzalo Aguila; Boris Chornik; Paulo Araya

doi:10.1016/j.apcatb.2012.04.036

Study of Na/Cu/TiO ₂ catalysts for the storage and reduction of NO

Sichem Guerrero^*, Igor Guzmán, Gonzalo Aguila, Boris Chornik, Paulo Araya

^*Corresponding author for this work

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

22 Scopus citations

Abstract

A Pt-free system based on Na/Cu/TiO ₂ catalysts was used to study the adsorption of NO under lean conditions. The results show that the NO adsorption activity dramatically increased when both sodium and copper are in intimate contact. Although copper is the active phase in the oxidation of NO to NO ₂, it was found that the addition of sodium species is of vital importance on the subsequent adsorption of NO ₂, which mainly occurs on the surface of the alkali in the form of nitrates and nitrites. It was found that a loading increase of the alkali led to an increase in the reduction temperature of the copper phase, which is ascribed to a close interaction between the copper and the sodium phases. Among the Na loadings that were studied, the addition of 5% Na gave the optimum adsorption of NO. After successive cycles of adsorption, the catalysts were fully regenerated at temperatures higher than 250°C using either CO or H ₂ as a reducing agent.

Original language	English
Pages (from-to)	282-295
Number of pages	14
Journal	Applied Catalysis B: Environmental
Volume	123-124
DOIs	https://doi.org/10.1016/j.apcatb.2012.04.036
State	Published - 23 Jul 2012

Bibliographical note

Funding Information:
The Chilean National Science and Technology Research Fund (FONDECYT) , project No. 3100068, and the project FAI ICI-001-10 from the Universidad de los Andes , are gratefully acknowledged for funding this work.

Keywords

Cu H -TPR
Cu/TiO
NO oxidation
NO reduction
NO storage
NSR
Na/Cu/TiO

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10.1016/j.apcatb.2012.04.036

Cite this

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title = "Study of Na/Cu/TiO 2 catalysts for the storage and reduction of NO",

abstract = "A Pt-free system based on Na/Cu/TiO 2 catalysts was used to study the adsorption of NO under lean conditions. The results show that the NO adsorption activity dramatically increased when both sodium and copper are in intimate contact. Although copper is the active phase in the oxidation of NO to NO 2, it was found that the addition of sodium species is of vital importance on the subsequent adsorption of NO 2, which mainly occurs on the surface of the alkali in the form of nitrates and nitrites. It was found that a loading increase of the alkali led to an increase in the reduction temperature of the copper phase, which is ascribed to a close interaction between the copper and the sodium phases. Among the Na loadings that were studied, the addition of 5% Na gave the optimum adsorption of NO. After successive cycles of adsorption, the catalysts were fully regenerated at temperatures higher than 250°C using either CO or H 2 as a reducing agent.",

keywords = "Cu H -TPR, Cu/TiO, NO oxidation, NO reduction, NO storage, NSR, Na/Cu/TiO",

author = "Sichem Guerrero and Igor Guzm{\'a}n and Gonzalo Aguila and Boris Chornik and Paulo Araya",

note = "Funding Information: The Chilean National Science and Technology Research Fund (FONDECYT) , project No. 3100068, and the project FAI ICI-001-10 from the Universidad de los Andes , are gratefully acknowledged for funding this work.",

year = "2012",

month = jul,

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doi = "10.1016/j.apcatb.2012.04.036",

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AU - Guerrero, Sichem

AU - Guzmán, Igor

AU - Aguila, Gonzalo

AU - Chornik, Boris

AU - Araya, Paulo

N1 - Funding Information: The Chilean National Science and Technology Research Fund (FONDECYT) , project No. 3100068, and the project FAI ICI-001-10 from the Universidad de los Andes , are gratefully acknowledged for funding this work.

PY - 2012/7/23

Y1 - 2012/7/23

N2 - A Pt-free system based on Na/Cu/TiO 2 catalysts was used to study the adsorption of NO under lean conditions. The results show that the NO adsorption activity dramatically increased when both sodium and copper are in intimate contact. Although copper is the active phase in the oxidation of NO to NO 2, it was found that the addition of sodium species is of vital importance on the subsequent adsorption of NO 2, which mainly occurs on the surface of the alkali in the form of nitrates and nitrites. It was found that a loading increase of the alkali led to an increase in the reduction temperature of the copper phase, which is ascribed to a close interaction between the copper and the sodium phases. Among the Na loadings that were studied, the addition of 5% Na gave the optimum adsorption of NO. After successive cycles of adsorption, the catalysts were fully regenerated at temperatures higher than 250°C using either CO or H 2 as a reducing agent.

AB - A Pt-free system based on Na/Cu/TiO 2 catalysts was used to study the adsorption of NO under lean conditions. The results show that the NO adsorption activity dramatically increased when both sodium and copper are in intimate contact. Although copper is the active phase in the oxidation of NO to NO 2, it was found that the addition of sodium species is of vital importance on the subsequent adsorption of NO 2, which mainly occurs on the surface of the alkali in the form of nitrates and nitrites. It was found that a loading increase of the alkali led to an increase in the reduction temperature of the copper phase, which is ascribed to a close interaction between the copper and the sodium phases. Among the Na loadings that were studied, the addition of 5% Na gave the optimum adsorption of NO. After successive cycles of adsorption, the catalysts were fully regenerated at temperatures higher than 250°C using either CO or H 2 as a reducing agent.

KW - Cu H -TPR

KW - Cu/TiO

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KW - NO reduction

KW - NO storage

KW - NSR

KW - Na/Cu/TiO

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