Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts

Zhao-Qiong Liu, William S. Epling, James A. Anderson

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A series of Pt/BaO/Al2O3 samples have been prepared with nominal Pt loadings ranging from 0.5 to 3.5 wt %. These samples were characterized in their fresh state and then subjected to an accelerated, mild, aging process which involved exposure of the catalysts to alternating rich and lean gas mixtures at 773 K. Characterization and storage results for the aged catalysts have been obtained. Aging effects were dependent on Pt loadings although there was no clear correlation between loading and the extent to which dispersion was lost during the accelerated aging process. Particular attention was given to the loadings and their temperature sensitive impacts on the form of the storage and release profiles including the NOx release spike accompanying the switch from lean to rich operation. Higher Pt loadings reduce the extent of NOx slip during lean to rich transition for low temperature operation.

Original languageEnglish
Pages (from-to)952-960
Number of pages9
JournalThe Journal of Physical Chemistry C
Volume115
Issue number4
DOIs
Publication statusPublished - 3 Feb 2011

Keywords

  • TRAP CATALYSTS
  • STORAGE/REDUCTION CATALYSTS
  • DISPERSION
  • PT/BAO/AL2O3
  • PERFORMANCE
  • OXIDATION
  • BEHAVIOR
  • PT/AL2O3
  • REMOVAL
  • ENGINE

Cite this

Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts. / Liu, Zhao-Qiong; Epling, William S.; Anderson, James A.

In: The Journal of Physical Chemistry C, Vol. 115, No. 4, 03.02.2011, p. 952-960.

Research output: Contribution to journalArticle

Liu, Zhao-Qiong ; Epling, William S. ; Anderson, James A. / Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts. In: The Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 4. pp. 952-960.
@article{7c99c9cbac8b488a952fd3e2f4c0e218,
title = "Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts",
abstract = "A series of Pt/BaO/Al2O3 samples have been prepared with nominal Pt loadings ranging from 0.5 to 3.5 wt {\%}. These samples were characterized in their fresh state and then subjected to an accelerated, mild, aging process which involved exposure of the catalysts to alternating rich and lean gas mixtures at 773 K. Characterization and storage results for the aged catalysts have been obtained. Aging effects were dependent on Pt loadings although there was no clear correlation between loading and the extent to which dispersion was lost during the accelerated aging process. Particular attention was given to the loadings and their temperature sensitive impacts on the form of the storage and release profiles including the NOx release spike accompanying the switch from lean to rich operation. Higher Pt loadings reduce the extent of NOx slip during lean to rich transition for low temperature operation.",
keywords = "TRAP CATALYSTS, STORAGE/REDUCTION CATALYSTS, DISPERSION, PT/BAO/AL2O3, PERFORMANCE, OXIDATION, BEHAVIOR, PT/AL2O3, REMOVAL, ENGINE",
author = "Zhao-Qiong Liu and Epling, {William S.} and Anderson, {James A.}",
year = "2011",
month = "2",
day = "3",
doi = "10.1021/jp1040037",
language = "English",
volume = "115",
pages = "952--960",
journal = "The Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "4",

}

TY - JOUR

T1 - Influence of Pt Loading in Aged NOx Storage and Reduction Catalysts

AU - Liu, Zhao-Qiong

AU - Epling, William S.

AU - Anderson, James A.

PY - 2011/2/3

Y1 - 2011/2/3

N2 - A series of Pt/BaO/Al2O3 samples have been prepared with nominal Pt loadings ranging from 0.5 to 3.5 wt %. These samples were characterized in their fresh state and then subjected to an accelerated, mild, aging process which involved exposure of the catalysts to alternating rich and lean gas mixtures at 773 K. Characterization and storage results for the aged catalysts have been obtained. Aging effects were dependent on Pt loadings although there was no clear correlation between loading and the extent to which dispersion was lost during the accelerated aging process. Particular attention was given to the loadings and their temperature sensitive impacts on the form of the storage and release profiles including the NOx release spike accompanying the switch from lean to rich operation. Higher Pt loadings reduce the extent of NOx slip during lean to rich transition for low temperature operation.

AB - A series of Pt/BaO/Al2O3 samples have been prepared with nominal Pt loadings ranging from 0.5 to 3.5 wt %. These samples were characterized in their fresh state and then subjected to an accelerated, mild, aging process which involved exposure of the catalysts to alternating rich and lean gas mixtures at 773 K. Characterization and storage results for the aged catalysts have been obtained. Aging effects were dependent on Pt loadings although there was no clear correlation between loading and the extent to which dispersion was lost during the accelerated aging process. Particular attention was given to the loadings and their temperature sensitive impacts on the form of the storage and release profiles including the NOx release spike accompanying the switch from lean to rich operation. Higher Pt loadings reduce the extent of NOx slip during lean to rich transition for low temperature operation.

KW - TRAP CATALYSTS

KW - STORAGE/REDUCTION CATALYSTS

KW - DISPERSION

KW - PT/BAO/AL2O3

KW - PERFORMANCE

KW - OXIDATION

KW - BEHAVIOR

KW - PT/AL2O3

KW - REMOVAL

KW - ENGINE

U2 - 10.1021/jp1040037

DO - 10.1021/jp1040037

M3 - Article

VL - 115

SP - 952

EP - 960

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

SN - 1932-7447

IS - 4

ER -