Investigation of NOx Adsorber Catalyst Deactivation

Dou, Danan; Bailey, O. H.

doi:10.4271/982594

Cited by 43 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These effects have been the subject of much study and are extensively documented in the literature [1][2][3][4][5][6][7][8][9][10][11]. While the DECSE program independently addresses each mechanism, this report will specifically address the latter.…”

Section: Fuel Sulfur Impact On Emissionsmentioning

confidence: 99%

Diesel Emission Control -- Sulfur Effects (DECSE) Program; Phase I Interim Date Report No. 3: Diesel Fuel Sulfur Effects on Particulate Matter Emissions

Doe¹,

Meca²

1999

View full text Add to dashboard Cite

ii The test program and subsequent data analysis represents a collaborative effort of a technical work group consisting of representatives from the U.S. Department of Energy, National Laboratories, Engine Manufacturers Association, and Manufacturers of Emission Controls Association. The work group prepared this report using methods believed to be consistent with accepted practice. All results and observations are based on information available using technologies that were state-of-the-art at the time of this effort. To the extent that additional information becomes available, or factors upon which analyses are based change, the findings could subsequently be affected. 11/08/99iii

show abstract

Section: Fuel Sulfur Impact On Emissionsmentioning

confidence: 99%

Diesel Emission Control -- Sulfur Effects (DECSE) Program; Phase I Interim Date Report No. 3: Diesel Fuel Sulfur Effects on Particulate Matter Emissions

Doe¹,

Meca²

1999

View full text Add to dashboard Cite

show abstract

“…1,2 Current adsorber formulations have been shown to lose NO x reduction performance over time. [4][5][6] This loss in performance is caused by a number of factors, but is primarily due to high temperature thermal aging and poisoning due to sulfur exposure. Exposure to high temperatures causes sintering of the washcoat and carrier.…”

Section: Introductionmentioning

confidence: 99%

“…Exposure to high temperatures causes sintering of the washcoat and carrier. 6,7 The resulting loss in reactive surface area reduces the NO x storage and reduction capacity. Sulfates formed in the exhaust have a higher binding affinity for alkali/alkali-earth/rare-earth metals than nitrates, requiring temperatures that are much higher than those present in typical diesel exhaust to be desorbed.…”

Section: Introductionmentioning

confidence: 99%

NOx Adsorber Aging on a Heavy-Duty On-Highway Diesel Engine - Part One

Schenk¹,

Laroo²

2003

SAE Technical Paper Series

View full text Add to dashboard Cite

A 5.9-liter medium-heavy-duty diesel engine, equipped with a diesel exhaust emission control system consisting of catalyzed diesel particulate filters and NO x adsorber catalysts arranged in a dual flow path configuration was evaluated with the goal of studying the thermal aging characteristics of a number of NO x adsorber formulations. These adsorbers were tested with near zero sulfur fuel and low sulfur engine oil to minimize the impact of sulfur poisoning on the test results. Testing was performed at a high temperature engine operating mode to provide accelerated but not abusive aging. The test duration ranged from 100 to 250 hours depending on the severity of the aging at the 100 hour mark. The initial "zero" sulfur testing screened the NO x adsorber formulations for future testing and established a thermal aging baseline.

show abstract

“…NOx adsorber catalysts have been shown to achieve high NOx conversion efficiencies over wide temperature windows in lean burn applications. [2][3][4] It has been shown that NOx adsorber reduction capacity decreases over time; and this has led to a number of studies that have investigated the mechanisms of deactivation. The main mechanisms responsible for this deactivation are the catalyst's susceptibility to thermal degradation due to precious metal and base metal migration (sintering), and sulfur poisoning.…”

Section: Introductionmentioning

confidence: 99%