Modeling and Simulation of NOx Abatement with Storage/Reduction Catalysts for Lean Burn and Diesel Engines

2007 ◽  
Author(s):  
Jan Koop ◽  
Olaf Deutschmann
Keyword(s):  
Modeling And Simulation ◽  
Diesel Engines ◽  
Lean Burn ◽  
Nox Abatement ◽  
Reduction Catalysts

Mass Transfer Effects in SCR Reactor for NOx Abatement in Diesel Engines

2018 ◽  
pp. 961-979 ◽  
Author(s):  
Hazal G. Karadağ ◽  
Selmi E. Bozbağ ◽  
Deniz Şanli ◽  
Onur Demir ◽  
Barkın Ozener ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Diesel Engines ◽  
Transfer Effects ◽  
Nox Abatement

A Comprehensive Review on Low-Temperature Combustion Technologies for Emission Reduction in Diesel Engines

2021 ◽  
Vol 18 (4) ◽  
Author(s):  
Amit Jhalani ◽  
Dilip Sharma ◽  
Pushpendra Kumar Sharma ◽  
Digambar Singh ◽  
Sumit Jhalani ◽  
...  
Keyword(s):  
Low Temperature ◽  
Diesel Engines ◽  
Alternative Fuels ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Lean Burn ◽  
Performance And Emissions ◽  
Temperature Combustion ◽  
Hc Emissions ◽  
Ci Engines

Diesel engines are lean burn engines; hence CO and HC emissions in the exhaust are less likely to occur in substantial amounts. The emissions of serious concern in compression ignition engines are particulate matter and nitrogen oxides because of elevated temperature conditions of combustion. Hence the researchers have strived continuously to lower down the temperature of combustion in order to bring down the emissions from CI engines. This has been tried through premixed charge compression ignition, homogeneous charge compression ignition (HCCI), gasoline compression ignition and reactivity controlled compression ignition (RCCI). In this study, an attempt has been made to critically review the literature on low-temperature combustion conditions using various conventional and alternative fuels. The problems and challenges augmented with the strategies have also been described. Water-in-diesel emulsion technology has been discussed in detail. Most of the authors agree over the positive outcomes of water-diesel emulsion for both performance and emissions simultaneously.

Evaluation of lean NOx reduction catalysts for controlling emissions from diesel engines

1998 ◽  
Vol 17 (1) ◽  
pp. 48-52 ◽  
Author(s):  
Christian E. Lindhjem ◽  
David A. Guerrieri
Keyword(s):  
Diesel Engines ◽  
Nox Reduction ◽  
Lean Nox Reduction ◽  
Lean Nox ◽  
Reduction Catalysts

Controlling automotive exhaust emissions: successes and underlying science

2005 ◽  
Vol 363 (1829) ◽  
pp. 1013-1033 ◽  
Author(s):  
Martyn V Twigg
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxides ◽  
Diesel Engines ◽  
Gasoline Engine ◽  
Photochemical Reactions ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Vehicle Exhaust ◽  
Lean Burn ◽  
Three Way Catalyst

Photochemical reactions of vehicle exhaust pollutants were responsible for photochemical smog in many cities during the 1960s and 1970s. Engine improvements helped, but additional measures were needed to achieve legislated emissions levels. First oxidation catalysts lowered hydrocarbon and carbon monoxide, and later nitrogen oxides were reduced to nitrogen in a two-stage process. By the 1980s, exhaust gas could be kept stoichiometric and hydrocarbons, carbon monoxide and nitrogen oxides were simultaneously converted over a single ‘three-way catalyst’. Today, advanced three-way catalyst systems emissions are exceptionally low. NO x control from lean-burn engines demands an additional approach because NO cannot be dissociated under lean conditions. Current lean-burn gasoline engine NO x control involves forming a nitrate phase and periodically enriching the exhaust to reduce it to nitrogen, and this is being modified for use on diesel engines. Selective catalytic reduction with ammonia is an alternative that can be very efficient, but it requires ammonia or a compound from which it can be obtained. Diesel engines produce particulate matter, and, because of health concerns, filtration processes are being introduced to control these emissions. On heavy duty diesel engines the exhaust gas temperature is high enough for NO in the exhaust to be oxidised over a catalyst to NO 2 that smoothly oxidises particulate material (PM) in the filter. Passenger cars operate at lower temperatures, and it is necessary to periodically burn the PM in air at high temperatures.

NOx Abatement in Exhaust from Lean-Burn Combustion Engines by Reduction of NO2 over Silver-Containing Zeolite Catalysts

1998 ◽  
Vol 37 (13-14) ◽  
pp. 1901-1903 ◽  
Author(s):  
Johan A. Martens ◽  
Anne Cauvel ◽  
Agna Francis ◽  
Chris Hermans ◽  
François Jayat ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
Combustion Engines ◽  
Lean Burn ◽  
Nox Abatement

scholarly journals Non-catalytic NOx reduction for marine Diesel engine: an experimental approach

2021 ◽  
Vol 312 ◽  
pp. 07015
Author(s):  
Anna Maria Raspolli Galletti ◽  
Stefano Frigo ◽  
Marco Antonelli ◽  
Gianluca Pasini ◽  
Paolo Bertetti ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Nox Reduction ◽  
Air Pollutant ◽  
Department Of Energy ◽  
Pollutant Emissions ◽  
Nox Abatement ◽  
Experimental Apparatus ◽  
First Results ◽  
The University

Recent legislation concerning air pollutant emissions from ships (Tier III) has considerably decreased NOx emission limits for recreational ships with less than 500 gross tonnages and greater than 24 m load line length (LLL), the so-called “large yachts”. For these yachts, which adopt multiple Diesel engines with maximum power ranging from 800 to 2000 kW, the new NOx limit is less than 2 g/kWh. To satisfy that limit, engine makers suggest the adoption of a classic SCR system with urea injection but this methodology, in addition to requiring a large space for installation, does not seem so appropriate for diesel engines of large yachts that normally operate at low power with exhaust temperatures often well below 300 °C, therefore not sufficient to allow the correct functioning of the SCR. The aforementioned circumstances have prompted Sanlorenzo Spa (La Spezia – Italy), one of the world’s leading companies in the production of pleasure boats, to collaborate with the University of Pisa in the study of alternative solutions to SCR systems. Recently there is a great interest in innovative NOx abatement systems, based on the possibility of absorbing NOx molecules into seawater through the utilization of appropriate aqueous solutions containing targeted saline oxidizing agents. The present study describes the first results of a research program aimed to identify, from one side, the best saline oxidizing agent for an aqueous NOx abatement and, from the other, the best washing methodology compatible with the propulsion layouts usually adopted on yachts. In the engine testing laboratories of the Department of Energy, Systems, Territory and Construction Engineering (DESTeC) of the University of Pisa, an experimental apparatus has been created to reproduce the real conditions of underwater engine exhausting. This device was combined with a small 1.2 L direct injection diesel engine. The first results showed a reduction of the NOx emissions of about 27% by using a gas washing with wet scrubber, followed by bubbling in water, using 0.2 molar NaClO saline solutions.

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