In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction: Role of Na promoter

Charles A. Roberts; Louisa Savereide; David J. Childers; Torin C. Peck; Justin M. Notestein

doi:10.1016/j.cattod.2015.12.014

In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction: Role of Na promoter

Charles A. Roberts^*, Louisa Savereide, David J. Childers, Torin C. Peck, Justin M. Notestein

^*Corresponding author for this work

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

11 Scopus citations

Abstract

The effect of Na on highly dispersed FeOx impregnated onto CeO₂ via the unique precursor Na/Fe-ethylenediaminetetraacetate (NaFeEDTA) was investigated by comparison to a series of well-defined catalysts synthesized by the traditional precursor Fe(NO₃)₃ both with and without Na addition. Catalysts were evaluated for steady-state NO reduction by CO and activities varied based on synthesis method and Fe:Na ratio. Na contributed a promoter effect when added at a stoichiometric ratio (Fe:Na = 1), providing an explanation for the higher activity of NaFeEDTA/CeO₂ for NO reduction by CO. Activity decreased when excess Na was present in Fe(NO₃)₃ catalysts, but the stoichiometric promoter effect persisted up to ∼4.0 Fe/nm². In situ Fourier transform infrared (FTIR) spectroscopy during NO adsorption revealed the presence of unique NO adsorption species (1460 cm^-1) on the NaFeEDTA/CeO₂, suggesting enhanced NO adsorption due to Na. At reaction temperature, FTIR bands of bulk nitrates on CeO₂ were quantitatively shown to more rapidly undergo NO reduction catalytic transformations over NaFeEDTA/CeO₂. These results increase understanding of mechanistic effects of Na on NO reduction over FeOx/CeO₂ catalysts and serve to guide future design of oxide-based emission control catalysts that are free of Pt-group metals.

Original language	English (US)
Pages (from-to)	56-64
Number of pages	9
Journal	Catalysis Today
Volume	267
DOIs	https://doi.org/10.1016/j.cattod.2015.12.014
State	Published - Jun 1 2016
Externally published	Yes

Keywords

Carbon monoxide
FTIR
In situ
Iron oxide
Nitric oxide
Sodium promoter

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1016/j.cattod.2015.12.014

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title = "In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction: Role of Na promoter",

abstract = "The effect of Na on highly dispersed FeOx impregnated onto CeO2 via the unique precursor Na/Fe-ethylenediaminetetraacetate (NaFeEDTA) was investigated by comparison to a series of well-defined catalysts synthesized by the traditional precursor Fe(NO3)3 both with and without Na addition. Catalysts were evaluated for steady-state NO reduction by CO and activities varied based on synthesis method and Fe:Na ratio. Na contributed a promoter effect when added at a stoichiometric ratio (Fe:Na = 1), providing an explanation for the higher activity of NaFeEDTA/CeO2 for NO reduction by CO. Activity decreased when excess Na was present in Fe(NO3)3 catalysts, but the stoichiometric promoter effect persisted up to ∼4.0 Fe/nm2. In situ Fourier transform infrared (FTIR) spectroscopy during NO adsorption revealed the presence of unique NO adsorption species (1460 cm-1) on the NaFeEDTA/CeO2, suggesting enhanced NO adsorption due to Na. At reaction temperature, FTIR bands of bulk nitrates on CeO2 were quantitatively shown to more rapidly undergo NO reduction catalytic transformations over NaFeEDTA/CeO2. These results increase understanding of mechanistic effects of Na on NO reduction over FeOx/CeO2 catalysts and serve to guide future design of oxide-based emission control catalysts that are free of Pt-group metals.",

keywords = "Carbon monoxide, FTIR, In situ, Iron oxide, Nitric oxide, Sodium promoter",

author = "Roberts, {Charles A.} and Louisa Savereide and Childers, {David J.} and Peck, {Torin C.} and Notestein, {Justin M.}",

year = "2016",

month = jun,

day = "1",

doi = "10.1016/j.cattod.2015.12.014",

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volume = "267",

pages = "56--64",

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publisher = "Elsevier B.V.",

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T1 - In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction

T2 - Role of Na promoter

AU - Roberts, Charles A.

AU - Savereide, Louisa

AU - Childers, David J.

AU - Peck, Torin C.

AU - Notestein, Justin M.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - The effect of Na on highly dispersed FeOx impregnated onto CeO2 via the unique precursor Na/Fe-ethylenediaminetetraacetate (NaFeEDTA) was investigated by comparison to a series of well-defined catalysts synthesized by the traditional precursor Fe(NO3)3 both with and without Na addition. Catalysts were evaluated for steady-state NO reduction by CO and activities varied based on synthesis method and Fe:Na ratio. Na contributed a promoter effect when added at a stoichiometric ratio (Fe:Na = 1), providing an explanation for the higher activity of NaFeEDTA/CeO2 for NO reduction by CO. Activity decreased when excess Na was present in Fe(NO3)3 catalysts, but the stoichiometric promoter effect persisted up to ∼4.0 Fe/nm2. In situ Fourier transform infrared (FTIR) spectroscopy during NO adsorption revealed the presence of unique NO adsorption species (1460 cm-1) on the NaFeEDTA/CeO2, suggesting enhanced NO adsorption due to Na. At reaction temperature, FTIR bands of bulk nitrates on CeO2 were quantitatively shown to more rapidly undergo NO reduction catalytic transformations over NaFeEDTA/CeO2. These results increase understanding of mechanistic effects of Na on NO reduction over FeOx/CeO2 catalysts and serve to guide future design of oxide-based emission control catalysts that are free of Pt-group metals.

AB - The effect of Na on highly dispersed FeOx impregnated onto CeO2 via the unique precursor Na/Fe-ethylenediaminetetraacetate (NaFeEDTA) was investigated by comparison to a series of well-defined catalysts synthesized by the traditional precursor Fe(NO3)3 both with and without Na addition. Catalysts were evaluated for steady-state NO reduction by CO and activities varied based on synthesis method and Fe:Na ratio. Na contributed a promoter effect when added at a stoichiometric ratio (Fe:Na = 1), providing an explanation for the higher activity of NaFeEDTA/CeO2 for NO reduction by CO. Activity decreased when excess Na was present in Fe(NO3)3 catalysts, but the stoichiometric promoter effect persisted up to ∼4.0 Fe/nm2. In situ Fourier transform infrared (FTIR) spectroscopy during NO adsorption revealed the presence of unique NO adsorption species (1460 cm-1) on the NaFeEDTA/CeO2, suggesting enhanced NO adsorption due to Na. At reaction temperature, FTIR bands of bulk nitrates on CeO2 were quantitatively shown to more rapidly undergo NO reduction catalytic transformations over NaFeEDTA/CeO2. These results increase understanding of mechanistic effects of Na on NO reduction over FeOx/CeO2 catalysts and serve to guide future design of oxide-based emission control catalysts that are free of Pt-group metals.

KW - Carbon monoxide

KW - FTIR

KW - In situ

KW - Iron oxide

KW - Nitric oxide

KW - Sodium promoter

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SP - 56

EP - 64

JO - Catalysis Today

JF - Catalysis Today

ER -

In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction: Role of Na promoter

Abstract

Keywords

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