Diesel Lean Nox Catalyst Technologies

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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.

Study Of Lean Nox Technology For Diesel Emission Control

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Author :
language : en
Publisher:
Release Date : 2000

Study Of Lean Nox Technology For Diesel Emission Control 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 engines because of their reliability and efficiency are a popular mobile source. The diesel engine operates at higher compression ratios and with leaner fuel mixtures and produces lower carbon monoxide and hydrocarbon emissions. The oxygen-rich environment leads to higher nitrogen oxides in the form of NO. Catalysts selectively promoting the reduction of NOx by HCs in a lean environment have been termed lean NOx catalyst ''LNC''. The two groups that have shown most promise are, Copper exchanged zeolite Cu/ZSM5, and Platinum on alumina Pt/Al2O3.

Nox Trap Catalysts And Technologies

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Author : Luca Lietti
language : en
Publisher: Royal Society of Chemistry
Release Date : 2018-06-13

Nox Trap Catalysts And Technologies written by Luca Lietti and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-13 with Science categories.

Vehicle exhaust emissions, particularly from diesel cars, are considered to be a significant problem for the environment and human health. Lean NOx Trap (LNT) or NOx Storage/Reduction (NSR) technology is one of the current techniques used in the abatement of NOx from lean exhausts. Researchers are constantly searching for new inexpensive catalysts with high efficiency at low temperatures and negligible fuel penalties, to meet the challenges of this field. This book will be the first to comprehensively present the current research on this important area. Covering the technology used, from its development in the early 1990s up to the current state-of-the-art technologies and new legislation. Beginning with the fundamental aspects of the process, the discussion will cover the real application standard through to the detailed modelling of full scale catalysts. Scientists, academic and industrial researchers, engineers working in the automotive sector and technicians working on emission control will find this book an invaluable resource.

Demonstration Of Lean Nox Catalytic Converter Technology On A Heavy Duty Diesel Engine

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Author : Martin J. Heimrich
language : en
Publisher:
Release Date : 1996

Demonstration Of Lean Nox Catalytic Converter Technology On A Heavy Duty Diesel Engine written by Martin J. Heimrich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Automobiles categories.

Lean Nox Trap Catalysis For Lean Burn Natural Gas Engines

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Author :
language : en
Publisher:
Release Date : 2004

Lean Nox Trap Catalysis For Lean Burn Natural Gas Engines written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

As the nation's demand for energy grows along with concern for the environment, there is a pressing need for cleaner, more efficient forms of energy. The internal combustion engine is well established as one of the most reliable forms of power production. They are commercially available in power ranges from 0.5 kW to 6.5 MW, which make them suitable for a wide range of distributed power applications from small scale residential to large scale industrial. In addition, alternative fuels with domestic abundance, such as natural gas, can play a key role in weaning our nations dependence on foreign oil. Lean burn natural gas engines can achieve high efficiencies and can be conveniently placed anywhere natural gas supplies are available. However, the aftertreatment of Nox emissions presents a challenge in lean exhaust conditions. Unlike carbon monoxide and hydrocarbons, which can be catalytically reduced in lean exhaust, NOx emissions require a net reducing atmosphere for catalytic reduction. Unless this challenge of NOx reduction can be met, emissions regulations may restrict the implementation of highly efficient lean burn natural gas engines for stationary power applications. While the typical three-way catalyst is ineffective for NOx reduction under lean exhaust conditions, several emerging catalyst technologies have demonstrated potential. The three leading contenders for lean burn engine de-NOx are the Lean NOx Catalyst (LNC), Selective Catalytic Reduction (SCR) and the Lean Nox Trap (LNT). Similar to the principles of SCR, an LNT catalyst has the ability to store NOx under lean engine operation. Then, an intermittent rich condition is created causing the stored NOx to be released and subsequently reduced. However, unlike SCR, which uses urea injection to create the reducing atmosphere, the LNT can use the same fuel supplied to the engine as the reductant. LNT technology has demonstrated high reduction efficiencies in diesel applications where diesel fuel is the reducing agent. The premise of this research is to explore the application of Lean NOx Trap technology to a lean burn natural gas engine where natural gas is the reducing agent. Natural gas is primarily composed of methane, a highly stable hydrocarbon. The two primary challenges addressed by this research are the performance of the LNT in the temperature ranges experienced from lean natural gas combustion and the utilization of the highly stable methane as the reducing agent. The project used an 8.3 liter lean burn natural gas engine on a dynamometer to generate the lean exhaust conditions. The catalysts were packaged in a dual path aftertreatment system, and a set of valves were used to control the flow of exhaust to either leg during adsorption and regeneration.

Lean Nox Technology

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Author :
language : en
Publisher:
Release Date : 1996

Lean Nox Technology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Automobiles categories.

Comparison Of Plasma Catalyst And Active Lean Nox Catalyst

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Author :
language : en
Publisher:
Release Date : 2000

Comparison Of Plasma Catalyst And Active Lean Nox Catalyst 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.

A number of NO(subscript x) control systems are being discussed for potential application to diesel engines. Unfortunately, it can be difficult to compare systems on an equal basis because data are run under different conditions, or reported against different test cycles, or not shown over a range of operating conditions. In addition, the fuel consumption penalty associated with the NO(subscript x) control technologies is not always reported. In this paper, we compare two diesel NO(subscript x) aftertreatment systems: (1) Plasma-Catalyst (PC): a nonthermal plasma followed by a catalyst; and (2) Active Lean NO(subscript x) Catalyst (ALNC): a NO(subscript x) catalyst designed to selectively reduce NO(subscript x) using hydrocarbon (HC) in the form of diesel fuel. Fuel is added to the exhaust to increase HC above normal diesel levels. These systems will be described in more detail in this report.

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.

Lean Nox Trap Regeneration Control Strategy On A 1 9l Turbocharged Diesel

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Author : Nicole Munguia
language : en
Publisher:
Release Date : 2009

Lean Nox Trap Regeneration Control Strategy On A 1 9l Turbocharged Diesel written by Nicole Munguia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

Various diesel NOx control technologies are being explored today as solutions for minimizing NOx emissions. The Lean NOx Trap is one of two products that offer high NOx conversion efficiency, but the LNT requires a regeneration strategy. The Lean NOx Trap control strategy offers a systematic approach in which engine control parameters are fully utilized to create an exhaust “rich” environment necessary for LNT catalyst regeneration. In the present study EGR throttling, inlet air-throttling and late-injections were the three control parameters tuned for LNT regeneration. The strategy was tested in-house and by GM engineers on a 1.9 L diesel engine coupled to a Diesel Oxidation Catalyst, Diesel Particulate Filter and a Lean NOx Trap. Siemens NOx sensors were used to evaluate the NOx conversion efficiency. It was found that the catalyst did reduce NOx output but was neither efficient at low-loads nor fully-effective throughout the drive-cycle as the DPF did clog as a result of too low a CO/HC ratio. The regeneration mode is open loop and should be closed loop to minimize the additional fueling necessary for creating a rich environment for LNT regeneration. There was no evidence that late injections contributed to regeneration. Instead of late-injections, a more robust, closed-loop control strategy should be explored that uses the air/fuel ratio from the exhaust manifold as the control parameter for maximizing NOx conversion efficiency while minimizing the fuel penalty.

Study On Low Nox Emission Control Using Newly Developed Lean Nox Catalyst For Diesel Engines

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Author : Tomoko Morita
language : en
Publisher:
Release Date : 2007

Study On Low Nox Emission Control Using Newly Developed Lean Nox Catalyst For Diesel Engines written by Tomoko Morita and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.