Diesel Fuel Sulfur Effects On The Performance Of Lean Nox Catalysts
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Diesel Fuel Sulfur Effects On The Performance Of Lean Nox Catalysts
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Author :
language : en
Publisher:
Release Date : 2000
Diesel Fuel Sulfur Effects On The Performance Of Lean Nox Catalysts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Evaluate the effects of diesel fuel sulfur on the performance of low temperature and high temperature Lean-NOx Catalysts. Evaluate the effects of up to 250 hours of aging on the performance of the Lean-NOx Catalysts with different fuel sulfur contents.
Diesel Fuel Sulfur Effects On The Performance Of Diesel Oxidation Catalysts
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Author :
language : en
Publisher:
Release Date : 2000
Diesel Fuel Sulfur Effects On The Performance Of Diesel Oxidation Catalysts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Research focus: - Impact of sulfur on: Catalyst performance; Short term catalyst durability. This presentation summarizes results from fresh catalyst performance evaluations - WVU contracted to conduct DOC and Lean NOx catalyst testing for DECSE DECSE program. (experimental details discussed previously).
Performance Of A Perovskite Based Lean Nox Trap Catalyst And Effects Of Thermal Degradation And Sulfur Poisoning
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Author : Crystle Constantinou
language : en
Publisher:
Release Date : 2012
Performance Of A Perovskite Based Lean Nox Trap Catalyst And Effects Of Thermal Degradation And Sulfur Poisoning written by Crystle Constantinou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Increases in vehicle exhaust emission regulations have led to research, development and improvements in catalytic converter technologies for gasoline-powered vehicles since the 1970s. Nowadays, there are strict regulations and standards for diesel engines as well, and one of the regulated species is nitrogen oxides (NOX). The lean NOX trap (LNT) catalyst has been studied and developed for use in lean burn (of which diesel is an example) engine exhaust as a technology to reduce NOX to N2. Typical LNT catalysts contain Pt, which catalyzes NO oxidation and NOX reduction, and an alkali or alkaline earth material for NOX storage via nitrate formation. The catalyst is operated in a cyclic mode, with one phase of the cycle under oxidizing conditions where NOX is trapped, and a second phase, which is reductant-rich relative to O2, where stored NOX is reduced to N2. A recently developed catalyst uses a perovskite material as part of the LNT formulation for the oxidation reactions thereby eliminating the need for Pt in a LNT. This catalyst does include Pd and Rh, added to accommodate hydrocarbon oxidation and NO reduction, respectively. Ba was used as the trapping component, and Ce was also part of the formulation. NO oxidation kinetics over the fully-formulated and bare perovskite material were determined, with NO, O2 and NO2 orders being at or near 1, 1 and -1, respectively for both samples. The fully-formulated sample, which contains Ba supported on the perovskite, was evaluated in terms of NOX trapping ability and NOX reduction as a function of temperature and reduction phase properties. Trapping and overall performance increased with temperature to 375°C, primarily due to improved NO oxidation, as NO2 is more readily trapped, or better diffusion of nitrates away from the initial trapping sites. At higher temperatures nitrate stability decreased, thus decreasing the trapping ability. At these higher temperatures, a more significant amount of unreduced NOX formed during the reduction phase, primarily due to nitrate instability and decomposition and the relative rates of the NOX and oxygen storage (OS) components reduction reactions. Most of the chemistry observed was similar to that observed over Pt-based LNT catalysts. However, there were some distinct differences, including a stronger nitrate diffusion resistance at low temperature and a more significant reductant-induced nitrate decomposition reaction. The perovskite-based lean NOX trap (LNT) catalyst was also evaluated after thermal aging and sulfur exposure. NO oxidation, NOX trapping ability and NOX reduction as a function of temperature and reduction phase properties were evaluated. Similar overall performance trends were seen before and after degradation, however lower performance after thermal aging and sulfur exposure were seen due to sintering effects and possible build-up of S species. Although performance results show that most of the sulfur was removed after desulfation, some sulfur remained affecting the trapping and reduction capabilities as well as the water gas shift (WGS) extent at lower temperatures. The Oxygen storage capacity (OSC) on the other hand was maintained after the catalyst was exposed to thermal aging and sulfur poisoning then desulfation, all of which suggest that the perovskite or Pd components were irreversibly poisoned to some extent.
Diesel Emission Control Sulfur Effects Decse Program Phase Ii Summary Report
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Author :
language : en
Publisher:
Release Date : 2000
Diesel Emission Control Sulfur Effects Decse Program Phase Ii Summary Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Diesel Emission Control Sulfur Effects Decse Program Phase I Interim Data Report No 2 No Sub X Adsorber Catalysts
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Author :
language : en
Publisher:
Release Date : 2001
Diesel Emission Control Sulfur Effects Decse Program Phase I Interim Data Report No 2 No Sub X Adsorber Catalysts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The Diesel Emission Control-Sulfur Effects (DECSE) is a joint government/industry program to determine the impact of diesel fuel sulfur levels on emission control systems whose use could lower emissions of nitrogen oxides (NOx) and particulate matter (PM) from on-highway trucks in the 2002--2004 model years. Phase 1 of the program was developed with the following objectives in mind: (1) evaluate the effects of varying the level of sulfur content in the fuel on the emission reduction performance of four emission control technologies; and (2) measure and compare the effects of up to 250 hours of aging on selected devices for multiple levels of fuel sulfur content. This interim report discusses the results of the DECSE test program that demonstrates the potential of NOx adsorber catalyst technology across the range of diesel engine operation with a fuel economy penalty less than 4%.
Advanced Petroleum Based Fuels Diesel Emissions Project Apbf Dec
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Author :
language : en
Publisher:
Release Date : 2007
Advanced Petroleum Based Fuels Diesel Emissions Project Apbf Dec written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Automobiles categories.
Presents the results of a 2,000-hour test of an emissions control system consisting of a nitrogen oxides adsorber catalyst in combination with a diesel particle filter, advanced fuels, and advanced engine controls in an SUV/pick-up truck vehicle platform.
Research Approach For Aging And Evaluating Diesel Exhaust Catalysts
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Author :
language : en
Publisher:
Release Date : 2000
Research Approach For Aging And Evaluating Diesel Exhaust Catalysts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
To determine the impact of diesel fuel sulfur levels on emissions control devices that could lower emissions of oxides of nitrogen (NOX) and particulate matter (PM) from on-highway trucks and buses in the 2002-2004 model years. West Virginia University is evaluating: - Diesel Oxidation Catalysts - Lean NOX Catalysts.
Ley No 4416 Y Su Reglamento De Pesca
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Author :
language : en
Publisher:
Release Date : 1937
Ley No 4416 Y Su Reglamento De Pesca written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1937 with categories.
Diesel Lean Nox Catalyst Technologies
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Author : Society of Automotive Engineers
language : en
Publisher: SAE International
Release Date : 1996
Diesel Lean Nox Catalyst Technologies written by Society of Automotive Engineers and has been published by SAE International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Technology & Engineering categories.
Sulfur Management Of Nox Adsorber Technology For Diesel Light Duty Vehicle And Truck Applications
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Author : C. Z. Wan
language : en
Publisher:
Release Date : 2003
Sulfur Management Of Nox Adsorber Technology For Diesel Light Duty Vehicle And Truck Applications written by C. Z. Wan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Sulfur poisoning from engine fuel and lube is one of the most recognizable degradation mechanisms of a NOx adsorber catalyst system for diesel emission reduction. Even with the availability of 15 ppm sulfur diesel fuel, NOx adsorber will be deactivated without an effective sulfur management. Two general pathways are currently being explored for sulfur management: (1) the use of a disposable SOx trap that can be replaced or rejuvenated offline periodically, and (2) the use of diesel fuel injection in the exhaust and high temperature de-sulfation approach to remove the sulfur poisons to recover the NOx trapping efficiency. The major concern of the de-sulfation process is the many prolonged high temperature rich cycles that catalyst will encounter during its useful life. It is shown that NOx adsorber catalyst suffers some loss of its trapping capacity upon high temperature lean-rich exposure. With the use of a disposable SOx trap to remove large portion of the sulfur poisons from the exhaust, the NOx adsorber catalyst can be protected and the numbers of de-sulfation events can be greatly reduced. Spectroscopic techniques, such as DRIFTS and Raman, have been used to monitor the underlying chemical reactions during NOx trapping/ regeneration and de-sulfation periods, and provide a fundamental understanding of NOx storage capacity and catalyst degradation mechanism using model catalysts. This paper examines the sulfur effect on two model NOx adsorber catalysts. The chemistry of SOx/base metal oxides and the sulfation product pathways and their corresponding spectroscopic data are discussed. SAE Paper SAE-2003-01-3245 {copyright} 2003 SAE International. This paper is published on this website with permission from SAE International. As a user of this website, you are permitted to view this paper on-line, download this pdf file and print one copy of this paper at no cost for your use only. The downloaded pdf file and printout of this SAE paper may not be copied, distributed or forwarded to others or for the use of others.