Study of Ca and Ba mixed oxides as storage materials in NOx storage reduction catalysts

Todd J. Toops; Josh A. Pihl; Chengdu Liang; Andrew Payzant

Study of Ca and Ba mixed oxides as storage materials in NOx storage reduction catalysts

Todd J. Toops, Josh A. Pihl, Chengdu Liang, Andrew Payzant

Research output: Contribution to journal › Conference article › peer-review

Abstract

NOx Storage Reduction (NSR) catalysts are being employed to meet the stringent emissions control requirements in fuel-efficient lean burn vehicles, but are currently limited by sulfur in fuel and its high temperature removal. This study evaluates a series of Ca and Ba mixed oxides to probe both the sulfate and nitrate stability as it relates to NSR performance and desulfation temperature. Results to date illustrate that Ba-only NSR catalysts have a significantly lower temperature of operation compared to Ca-only catalysts. When the Ca+Ba oxides are mixed during dispersion, i.e. before oxide formation, it results in several synergistic effects. The desulfation temperature is lowered for NSR catalysts with less than 10% Ca and the low temperature performance is shown to increase. This effort discusses these observations and relates the results to materials characterization analysis.

Original language	English
Journal	ACS National Meeting Book of Abstracts
State	Published - 2011
Event	242nd ACS National Meeting and Exposition - Denver, CO, United States Duration: Aug 28 2011 → Sep 1 2011

Cite this

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title = "Study of Ca and Ba mixed oxides as storage materials in NOx storage reduction catalysts",

abstract = "NOx Storage Reduction (NSR) catalysts are being employed to meet the stringent emissions control requirements in fuel-efficient lean burn vehicles, but are currently limited by sulfur in fuel and its high temperature removal. This study evaluates a series of Ca and Ba mixed oxides to probe both the sulfate and nitrate stability as it relates to NSR performance and desulfation temperature. Results to date illustrate that Ba-only NSR catalysts have a significantly lower temperature of operation compared to Ca-only catalysts. When the Ca+Ba oxides are mixed during dispersion, i.e. before oxide formation, it results in several synergistic effects. The desulfation temperature is lowered for NSR catalysts with less than 10% Ca and the low temperature performance is shown to increase. This effort discusses these observations and relates the results to materials characterization analysis.",

author = "Toops, {Todd J.} and Pihl, {Josh A.} and Chengdu Liang and Andrew Payzant",

year = "2011",

language = "English",

journal = "ACS National Meeting Book of Abstracts",

issn = "0065-7727",

note = "242nd ACS National Meeting and Exposition ; Conference date: 28-08-2011 Through 01-09-2011",

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TY - JOUR

T1 - Study of Ca and Ba mixed oxides as storage materials in NOx storage reduction catalysts

AU - Toops, Todd J.

AU - Pihl, Josh A.

AU - Liang, Chengdu

AU - Payzant, Andrew

PY - 2011

Y1 - 2011

N2 - NOx Storage Reduction (NSR) catalysts are being employed to meet the stringent emissions control requirements in fuel-efficient lean burn vehicles, but are currently limited by sulfur in fuel and its high temperature removal. This study evaluates a series of Ca and Ba mixed oxides to probe both the sulfate and nitrate stability as it relates to NSR performance and desulfation temperature. Results to date illustrate that Ba-only NSR catalysts have a significantly lower temperature of operation compared to Ca-only catalysts. When the Ca+Ba oxides are mixed during dispersion, i.e. before oxide formation, it results in several synergistic effects. The desulfation temperature is lowered for NSR catalysts with less than 10% Ca and the low temperature performance is shown to increase. This effort discusses these observations and relates the results to materials characterization analysis.

AB - NOx Storage Reduction (NSR) catalysts are being employed to meet the stringent emissions control requirements in fuel-efficient lean burn vehicles, but are currently limited by sulfur in fuel and its high temperature removal. This study evaluates a series of Ca and Ba mixed oxides to probe both the sulfate and nitrate stability as it relates to NSR performance and desulfation temperature. Results to date illustrate that Ba-only NSR catalysts have a significantly lower temperature of operation compared to Ca-only catalysts. When the Ca+Ba oxides are mixed during dispersion, i.e. before oxide formation, it results in several synergistic effects. The desulfation temperature is lowered for NSR catalysts with less than 10% Ca and the low temperature performance is shown to increase. This effort discusses these observations and relates the results to materials characterization analysis.

UR - http://www.scopus.com/inward/record.url?scp=84861048520&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:84861048520

SN - 0065-7727

JO - ACS National Meeting Book of Abstracts

JF - ACS National Meeting Book of Abstracts

T2 - 242nd ACS National Meeting and Exposition

Y2 - 28 August 2011 through 1 September 2011

ER -

Study of Ca and Ba mixed oxides as storage materials in NOx storage reduction catalysts

Abstract

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