Reduction of NOx over various Fe/zeolite catalysts

Hai Ying Chen; Xiang Wang; Wolfgang M.H. Sachtler

doi:10.1016/S0926-860X(99)00364-6

Reduction of NO_x over various Fe/zeolite catalysts

Hai Ying Chen, Xiang Wang, Wolfgang M.H. Sachtler

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92 Scopus citations

Abstract

A systematic comparison was made of the catalytic activity of a variety of Fe/zeolite catalysts in the selective catalytic reduction of NO_x with iso-butane or propane, both with dry and wet feeds. All catalysts were prepared by subliming FeCl₃ vapor onto the H-form of the zeolite, followed by Cl removal. The activities decrease in the order Fe/BEA > Fe/MFI ≫ Fe/FER > Fe/MOR ≈ Fe/Y. These differences are rationalized in terms of our mechanistic model and the known pore geometry of the zeolites. FT-IR shows that some Fe loaded narrow pore zeolites are able to oxidize NO to NO₂ and form NO_y chemisorption complexes, but unable to let iso-butane enter the pores. Unlike some wider pore zeolites that become covered by a carbonaceous deposit at low temperature, these materials retain their high activity for NO oxidation. Mixtures of Fe loaded wide and narrow pore zeolites, therefore, lead to higher steady-state activities at low temperature than single catalysts. In particular, the combination of Fe/MFI with Fe/FER displays a spectacular activity enhancement.

Original language	English
Pages (from-to)	159-168
Number of pages	10
Journal	Applied Catalysis A: General
Volume	194
DOIs	https://doi.org/10.1016/S0926-860X(99)00364-6
State	Published - Mar 13 2000
Externally published	Yes

Funding

Financial support from the Director of the Chemistry Division, Basic Energy Sciences, U.S. Department of Energy, Grant DE-FGO2-87ER13654, is gratefully acknowledged.

Funders	Funder number
U.S. Department of Energy	DE-FGO2-87ER13654
Basic Energy Sciences

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10.1016/S0926-860X(99)00364-6

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title = "Reduction of NOx over various Fe/zeolite catalysts",

abstract = "A systematic comparison was made of the catalytic activity of a variety of Fe/zeolite catalysts in the selective catalytic reduction of NOx with iso-butane or propane, both with dry and wet feeds. All catalysts were prepared by subliming FeCl3 vapor onto the H-form of the zeolite, followed by Cl removal. The activities decrease in the order Fe/BEA > Fe/MFI ≫ Fe/FER > Fe/MOR ≈ Fe/Y. These differences are rationalized in terms of our mechanistic model and the known pore geometry of the zeolites. FT-IR shows that some Fe loaded narrow pore zeolites are able to oxidize NO to NO2 and form NOy chemisorption complexes, but unable to let iso-butane enter the pores. Unlike some wider pore zeolites that become covered by a carbonaceous deposit at low temperature, these materials retain their high activity for NO oxidation. Mixtures of Fe loaded wide and narrow pore zeolites, therefore, lead to higher steady-state activities at low temperature than single catalysts. In particular, the combination of Fe/MFI with Fe/FER displays a spectacular activity enhancement.",

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T1 - Reduction of NOx over various Fe/zeolite catalysts

AU - Chen, Hai Ying

AU - Wang, Xiang

AU - Sachtler, Wolfgang M.H.

PY - 2000/3/13

Y1 - 2000/3/13

N2 - A systematic comparison was made of the catalytic activity of a variety of Fe/zeolite catalysts in the selective catalytic reduction of NOx with iso-butane or propane, both with dry and wet feeds. All catalysts were prepared by subliming FeCl3 vapor onto the H-form of the zeolite, followed by Cl removal. The activities decrease in the order Fe/BEA > Fe/MFI ≫ Fe/FER > Fe/MOR ≈ Fe/Y. These differences are rationalized in terms of our mechanistic model and the known pore geometry of the zeolites. FT-IR shows that some Fe loaded narrow pore zeolites are able to oxidize NO to NO2 and form NOy chemisorption complexes, but unable to let iso-butane enter the pores. Unlike some wider pore zeolites that become covered by a carbonaceous deposit at low temperature, these materials retain their high activity for NO oxidation. Mixtures of Fe loaded wide and narrow pore zeolites, therefore, lead to higher steady-state activities at low temperature than single catalysts. In particular, the combination of Fe/MFI with Fe/FER displays a spectacular activity enhancement.

AB - A systematic comparison was made of the catalytic activity of a variety of Fe/zeolite catalysts in the selective catalytic reduction of NOx with iso-butane or propane, both with dry and wet feeds. All catalysts were prepared by subliming FeCl3 vapor onto the H-form of the zeolite, followed by Cl removal. The activities decrease in the order Fe/BEA > Fe/MFI ≫ Fe/FER > Fe/MOR ≈ Fe/Y. These differences are rationalized in terms of our mechanistic model and the known pore geometry of the zeolites. FT-IR shows that some Fe loaded narrow pore zeolites are able to oxidize NO to NO2 and form NOy chemisorption complexes, but unable to let iso-butane enter the pores. Unlike some wider pore zeolites that become covered by a carbonaceous deposit at low temperature, these materials retain their high activity for NO oxidation. Mixtures of Fe loaded wide and narrow pore zeolites, therefore, lead to higher steady-state activities at low temperature than single catalysts. In particular, the combination of Fe/MFI with Fe/FER displays a spectacular activity enhancement.

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VL - 194

SP - 159

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

ER -

Reduction of NO_x over various Fe/zeolite catalysts

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