Influences of heat treatment and DeNOx performance of cordierite honeycombs washcoated with spinel catalysts

Md Hasan Zahir

doi:10.1016/j.matchemphys.2011.08.029

Influences of heat treatment and DeNO_x performance of cordierite honeycombs washcoated with spinel catalysts

Md Hasan Zahir^*

^*Corresponding author for this work

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

6 Scopus citations

Abstract

Spinel powders MAl₂O₄ (M = Ga and Zn) have been prepared by the co-precipitation of aqueous solutions containing corresponding metal, aluminum nitrate and ammonium carbonate. The NO reduction activities of composite spinel type powders in the Ga₂O₃-Al ₂O₃-ZnO (GAZ) system were studied, in regard to their high-temperature application as an automotive lean-burn exhaust catalyst. A correlation between the NH₃-TPD results and the activity of GAZ reveals that a high population of surface acid sites is important to achieve high activity. The cordierite honeycombs with cell sizes 100, 200, 400 and 900 cpsi (cells per square inch) were washcoated with the GAZ slurries and their NO reduction activity was evaluated. The durability of GAZ/cordierites was studied in the presence of H₂O vapor, SO₂ and O₂.

Original language	English
Pages (from-to)	1038-1045
Number of pages	8
Journal	Materials Chemistry and Physics
Volume	130
Issue number	3
DOIs	https://doi.org/10.1016/j.matchemphys.2011.08.029
State	Published - 1 Nov 2011

Keywords

FTIR
NMR
NO reduction
Oxides
Precipitation

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.matchemphys.2011.08.029

Cite this

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title = "Influences of heat treatment and DeNOx performance of cordierite honeycombs washcoated with spinel catalysts",

abstract = "Spinel powders MAl2O4 (M = Ga and Zn) have been prepared by the co-precipitation of aqueous solutions containing corresponding metal, aluminum nitrate and ammonium carbonate. The NO reduction activities of composite spinel type powders in the Ga2O3-Al 2O3-ZnO (GAZ) system were studied, in regard to their high-temperature application as an automotive lean-burn exhaust catalyst. A correlation between the NH3-TPD results and the activity of GAZ reveals that a high population of surface acid sites is important to achieve high activity. The cordierite honeycombs with cell sizes 100, 200, 400 and 900 cpsi (cells per square inch) were washcoated with the GAZ slurries and their NO reduction activity was evaluated. The durability of GAZ/cordierites was studied in the presence of H2O vapor, SO2 and O2.",

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T1 - Influences of heat treatment and DeNOx performance of cordierite honeycombs washcoated with spinel catalysts

AU - Zahir, Md Hasan

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N2 - Spinel powders MAl2O4 (M = Ga and Zn) have been prepared by the co-precipitation of aqueous solutions containing corresponding metal, aluminum nitrate and ammonium carbonate. The NO reduction activities of composite spinel type powders in the Ga2O3-Al 2O3-ZnO (GAZ) system were studied, in regard to their high-temperature application as an automotive lean-burn exhaust catalyst. A correlation between the NH3-TPD results and the activity of GAZ reveals that a high population of surface acid sites is important to achieve high activity. The cordierite honeycombs with cell sizes 100, 200, 400 and 900 cpsi (cells per square inch) were washcoated with the GAZ slurries and their NO reduction activity was evaluated. The durability of GAZ/cordierites was studied in the presence of H2O vapor, SO2 and O2.

AB - Spinel powders MAl2O4 (M = Ga and Zn) have been prepared by the co-precipitation of aqueous solutions containing corresponding metal, aluminum nitrate and ammonium carbonate. The NO reduction activities of composite spinel type powders in the Ga2O3-Al 2O3-ZnO (GAZ) system were studied, in regard to their high-temperature application as an automotive lean-burn exhaust catalyst. A correlation between the NH3-TPD results and the activity of GAZ reveals that a high population of surface acid sites is important to achieve high activity. The cordierite honeycombs with cell sizes 100, 200, 400 and 900 cpsi (cells per square inch) were washcoated with the GAZ slurries and their NO reduction activity was evaluated. The durability of GAZ/cordierites was studied in the presence of H2O vapor, SO2 and O2.

KW - FTIR

KW - NMR

KW - NO reduction

KW - Oxides

KW - Precipitation

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