The nature of cobalt species in Co-ZSM-5 NO emission control catalysts

Tao Sun; Michel L. Trudeau; Jackie Y. Ying

doi:10.1021/jp953678n

The nature of cobalt species in Co-ZSM-5 NO emission control catalysts

Tao Sun
, Michel L. Trudeau
, Jackie Y. Ying^*

^*Corresponding author for this work

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

43 Scopus citations

Abstract

The chemical nature of Co²⁺ ion-exchanged ZSM-5 catalyst has been studied by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). EPR and in-situ XPS investigations show that the oxygen coordination geometry around the Co²⁺ at intersections or in channels of ZSM-5 does not have high symmetry and that Co²⁺ cations occupy at least two different sites in the zeolitic pores. The oxidation state of Co²⁺ cations in ZSM-5 zeolites remains unchanged after being treated in oxygen at 450°C, while the locations and coordination of the Co²⁺ cations may have been altered. In-situ DRIFT studies of Co-ZSM-5 illustrate a strong interaction of Co²⁺ cations with coordinated molecular oxygen species, indicating a modification of the catalytically active sites in Co-ZSM-5 by oxygen or NO₂ under the simulated exhaust condition.

Original language	English
Pages (from-to)	13662-13666
Number of pages	5
Journal	Journal of Physical Chemistry
Volume	100
Issue number	32
DOIs	https://doi.org/10.1021/jp953678n
State	Published - 8 Aug 1996
Externally published	Yes

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ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

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10.1021/jp953678n

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title = "The nature of cobalt species in Co-ZSM-5 NO emission control catalysts",

abstract = "The chemical nature of Co2+ ion-exchanged ZSM-5 catalyst has been studied by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). EPR and in-situ XPS investigations show that the oxygen coordination geometry around the Co2+ at intersections or in channels of ZSM-5 does not have high symmetry and that Co2+ cations occupy at least two different sites in the zeolitic pores. The oxidation state of Co2+ cations in ZSM-5 zeolites remains unchanged after being treated in oxygen at 450°C, while the locations and coordination of the Co2+ cations may have been altered. In-situ DRIFT studies of Co-ZSM-5 illustrate a strong interaction of Co2+ cations with coordinated molecular oxygen species, indicating a modification of the catalytically active sites in Co-ZSM-5 by oxygen or NO2 under the simulated exhaust condition.",

author = "Tao Sun and Trudeau, \{Michel L.\} and Ying, \{Jackie Y.\}",

year = "1996",

month = aug,

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doi = "10.1021/jp953678n",

language = "English",

volume = "100",

pages = "13662--13666",

journal = "Journal of Physical Chemistry",

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number = "32",

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TY - JOUR

T1 - The nature of cobalt species in Co-ZSM-5 NO emission control catalysts

AU - Sun, Tao

AU - Trudeau, Michel L.

AU - Ying, Jackie Y.

PY - 1996/8/8

Y1 - 1996/8/8

N2 - The chemical nature of Co2+ ion-exchanged ZSM-5 catalyst has been studied by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). EPR and in-situ XPS investigations show that the oxygen coordination geometry around the Co2+ at intersections or in channels of ZSM-5 does not have high symmetry and that Co2+ cations occupy at least two different sites in the zeolitic pores. The oxidation state of Co2+ cations in ZSM-5 zeolites remains unchanged after being treated in oxygen at 450°C, while the locations and coordination of the Co2+ cations may have been altered. In-situ DRIFT studies of Co-ZSM-5 illustrate a strong interaction of Co2+ cations with coordinated molecular oxygen species, indicating a modification of the catalytically active sites in Co-ZSM-5 by oxygen or NO2 under the simulated exhaust condition.

AB - The chemical nature of Co2+ ion-exchanged ZSM-5 catalyst has been studied by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). EPR and in-situ XPS investigations show that the oxygen coordination geometry around the Co2+ at intersections or in channels of ZSM-5 does not have high symmetry and that Co2+ cations occupy at least two different sites in the zeolitic pores. The oxidation state of Co2+ cations in ZSM-5 zeolites remains unchanged after being treated in oxygen at 450°C, while the locations and coordination of the Co2+ cations may have been altered. In-situ DRIFT studies of Co-ZSM-5 illustrate a strong interaction of Co2+ cations with coordinated molecular oxygen species, indicating a modification of the catalytically active sites in Co-ZSM-5 by oxygen or NO2 under the simulated exhaust condition.

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DO - 10.1021/jp953678n

M3 - Article

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SP - 13662

EP - 13666

JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

IS - 32

ER -

The nature of cobalt species in Co-ZSM-5 NO emission control catalysts

Abstract

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